Wow! I Didn’t Know A Prebuilt House Could Do This

[@UndecidedMF]

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[@BearMeat4Dinner]

Looks amazing n great job on the house!!!

[@highlander723]

I'm disappointed in that Why are God's name are you using wood to build your home!!! Why are you murdering trees!!! You're supposed to be setting an example for going carbon neutral!!! I'm so disappointed in you!!! How much carbon dioxide did you make building your home!!!!

[@michaelwerbick]

All depends on the QUALITY control. Ive owned 4 homes. We had one pre-fab that was atrocious and a stick build that was phenomenally efficient. However, in New England, why build a slab on grade home without at least a partial basement? Unless I missed it...

[@lickshotpalmer1]

Hi Matt. Have you given any thought to using EV battery(ies) i/o dedicated solar power system batteries. I would imagine the savings would be considerable since you get so much bang for your buck with EV batteries. For instance, 75-, 80, 90 or even 100 Kwh EV battery could be had for anywhere between $8-12k, whereas you would be spending that much or more for a 10-12 Kwh dedicated solar battery.

[@micjr21]

Looks awesome man. Just want to let you know they also have this new thing that pressurizes your house and blows silicone in the air to fill all the little gaps & pin holes to make it as close to100% sealed as possible. If you haven't seen it yet you should look into it before you finish the interior.

[@jackielinde7568]

There is a channel (mostly forging now) that built a spec house in Washington to show how a house is built. The host of the channel was an old framer/carpenter said that construction was 50% logistics. To him planning where to store supplies on site and what directions the construction crews would be working from was just as important as the actual work. The fact they started at the point furthest from the crane and worked their way towards the crane illustrates that point. It's easiest and safest to "fly those walls" to their final position without having to navigate around or above other objects. This also creates a safer environment because you don't have to worry who's getting hurt or what's getting damaged should the wall smack into something or the chain carrying it fails. I'd be suspicious if your building crew wasn't constructing the house in the way they did.

[@Reason0684]

You're referring to the Essential Craftsman. I watched that whole series. It was absolutely amazing.

[@jackielinde7568]

@@Reason0684 Yeah, it's been a while, so I didn't remember the channel name. Not that into smithing, so I have since gone on to other groups' projects, like The Tally Ho Reconstruction by Sampson's Boat Company.

[@davehu8829]

That was in OR, not WA.

[@KnightsWithoutATable]

@@davehu8829 Came to say this.

[@Sindrijo]

@@Reason0684 Keep up the good work.

[@nancybehrenberg8986]

My wife and I were looking for a house around the time you and your wife were. The way the housing market was after the pandemic was to say the least, crazy. I have been following your channel for about four years and plan for going as green as I can within my means. One of your topics you had covered was modular homes. That modern modular homes are a close second to a passive home like yours will be. This is the direction my wife and I took. After nearly a year of looking for property and material and labor shortages, our house was built. It took them only a day to place the pieces of the house on the basement foundation. Our house walls are R29, the attic R49 and the windows are all Low-E, argon filled. We moved in about six months ago, and in about two weeks, our solar panels are going to be installed. The whole thing is an exciting process. One I wouldn't have missed for anything. Patience is the only thing needed. I wish you and your wife luck going through your process.

[@johnlozauskas778]

Great add on story.

[@glamdring0007]

The first house I bought was a factory constructed home I had built in NE Connecticut back in the mid 1990's. It was easily the most efficient home I've owned as the walls were all closed cell foam insulated which essentially meant I lived in a giant thermos. My heating and cooling costs were a fraction of other home owners I spoke to in the area. I wouldn't hesitate to build another home in the same manner as the cost, speed, quality, and over all experience was just better than going "stick built" traditional construction. Knowing my new home had a long term warranty from the factory was also a nice perk most home builders never get.

[@colombianrednek5561]

That's awesome. I wonder what his cost and warranty are for this project; estimated, current, and projected cost from current position.

[@CUBETechie]

I have more concerns about cooling then heating

[@anonym3017]

@@CUBETechie insulation is equally effective no matter which side is the colder one. So cooling works as well as any other home but requires way less energy and probably a smaller AC system in general.

[@HCG]

@@CUBETechieYou understand how insulation works, right..? If it’s good at staying warm, it’s good at staying cold-very simple.

[@wojciechzielinski7825]

I researched prefab homes in my country and found they were either more expensive or just as costly as traditional construction methods. Additionally, the lead time for delivery was longer than hiring workers and building, and the warranty for the walls was limited to only 5 years. And finding the info about warranty required close examination of the agreement.

[@seabrightnorth]

We moved into a pre built home 20 years ago not far from you here in NH. From the get-go we found it an incredibly tight home. Even today, 20 years later, bright sun low in the sky put the interior temp up to 73 degrees. South facing windows help a ton but the tightness remains and the house stays warm. Someday we will put on solar panels but until then we are very happy with our New England built home. Thank you for sharing your journey

[@michaelralph]

Thanks, Matt - great video. I’m an architect and certified passive house designer and I think you did a good job of explaining the principles of passive house design along with the visuals you presented. I look forward to seeing more videos related to your house build, specifically the geothermal system, ERV installation, and solar/battery details. Congrats on building your passive house and achieving 0.54 ACH!

[@ljdavick]

I am also interested in seeing your excellent explanation skills show us your GSHP, ERV, solar + batteries, appliances, smart home, audio / video / studio, hydronic floor?

[@theonlybuster]

Previous Contractor and now licensed plan reviewer and inspector here. I love seeing videos like this. When most of these tests are done, the owner isn't there so it's nice to get the viewpoint from the owner and soon-to-be tenant.

[@archer9338]

Mike, when it comes to ACH, how much more difficult and costly does it get the lower you try to get it under 0.6?

[@JoMiTo83]

It’s really hard to reveal costs, but I would love to see a final breakdown of costs after it’s all in place. I’m a huge fan of this, and would like to see what this cost would be vs a “normal” home cost to see why we all aren’t just doing this for all new houses. Great work, been watching since 2019, keep the videos coming.

[@MrSteeDoo]

It's not being done because it costs a lot more.

[@Professor-Scientist]

Like most things its going to be a much higher upfront cost but will save money in long term with it being cheaper to run, I'd imagine you wouldn't break even for a couple of decades at least. It still makes financial sense but a large portion of people won't have the opportunity to afford the upfront cost.

[@MrSteeDoo]

@@Professor-Scientist A home could be stick-built with the same level of airtightness. It is just not done very often.

[@Professor-Scientist]

@@MrSteeDoo stick-built?

[@KWParrish]

@@Professor-Scientist built on site vs Pre-fab, as shown here.

[@pinchekittybiker]

I used to work for a company that built ICF homes in Houston, Tx. It was fascinating to see how the home went together. The framing was made from steel, and the walls were around 8" thick with 2" of foam on each side, with a center of poured concrete. The walls were rated at R50. We would turn on the HVAC systemand chill the house to around 60 degrees - then we would turn it off. It literally took weeks for the temperature to rise despite the upper 90s temperatures outside. I am sure that opening and closing the doors multiple times a day didn't help, but it absolutely was a huge selling point. Unfortunately, compared to stick-built homes, they couldn't really compete price-wise, but the homes were amazing and incredibly beautiful.

[@paladain55]

R-23 ish not R-50 but yeah nonetheless they are impressive. Most walls are R-13 batt 2x4 walls that end up around R-11 fully built.

[@scottsullivan234]

One would guess that prefab houses were cheaper. It takes a lot less time and the materials are similar to traditional homes.

[@RipsterSA]

Could you please provide the name of the Houston company and/or their website?! Thanks.

[@teekanne15]

In germany many of the passive houses that were built inn the 90s now have issues with mold, because there is to little air exchange.

[@jandrade1713]

@@teekanne15 sounds like they need a dehumidifier built in.

[@justme4289]

Hi, Matt. We are considering a build with Unity and love the fact you are documenting your experience. I am hoping you have a little more information on the foundation. I know slabs are popular in some parts of the country, but here in New England, basements are more common. I am wondering why you chose the slab. Was it a cost consideration or did the slab add to the energy efficiency of the build? I am guessing you thought a lot about the foundation and just wanted to hear your thoughts.

[@scubascoob7441]

I am also curious about this.

[@edwardcullen8501]

@@scubascoob7441 I will let Matt give the official response but if you imagine an envelope (or better a box) you lose a lot if you neglect to put the last side on. The bottom is important. I like my basement too but the "bottom of the box" is important and to close the loop with a basement would increase the cost possibly by a factor of .5. Now I'll wait with you to see what Matt says.

[@BostonDigitalMedia]

Wondering about this too.

[@davidbarry6900]

I imagine that having a basement or not is affected a lot by the type of ground material below (digging is expensive and timeconsuming), underground hydrology and risks of water penetration into your basement, as well as exposing additional concrete surface to the ground which is much harder to insulate (much more surface area etc.), if you are aiming for a Passive house. These factors all increase the costs of building; single level is much cheaper, if you have sufficient space/lot size (and are not constrained by other regulations or municipal/zoning requirements). Finally, a basement is also a choice that may be very important in some regions (e.g. tornado-prone areas), or unnecessary/undesirable in other areas (especially if there is a lot of surface water/rain/flooding). I have no idea which of these factors were relevant for Matt; it's possible that they simply didn't even think about the option of a basement.

[@johnmerry18]

I am hoping to see radiant floor heat. Basements are nice for all the mechanical equipment. Thinking Matt must have built where the water table is high...

[@Lui2692]

I am really curious about your battery storage solution and your geothermal setup along with costs and the research you did to choose who you went with.

[@VoltairePower]

Yes, me too. Are you connecting to the grid? If not, was there pushback? Were you able to get a build permit without a grid connect plan?

[@moongooat]

@@VoltairePower He is connected to the grid (otherwise there would not be a possibility to sell electricity). However, Im curious about if his house alows electrical islanding (this is the possibility to automatically or manually disconnect from external grid and just run of the own power from solar and batteries), not sure abot this in his new house. What most people don't know about solar installations is that all installations depend on external working grid to use the power from solar panels, so if a storm takes down the external power lines there will be no electicity despite having solar roof and battery bank. 😞 If the installation is built for iselanding, then the house can work as normal temporarly offgrid. My cottage is fully offgrid (installing main grid was crazy expensive, thats why) and solar power works extremley well.

[@johnwhite2576]

@@moongooat not sure that precisely correct- if you have battery backup you are charging from the grid, yes, but you definitely have electricity in a storm.

[@moongooat]

@@johnwhite2576 If he can sell electricity to the grid. He is connected to the grid. As simple as that. It does not make you offgrid if there comes a storm and disconnects you from the grid 🙂However, if the house has islanding, then he can temporarly run without external grid.

[@toddcurtis1377]

It's interesting seeing the different extents to which pre-built homes are in fact, pre-built. There's a factory in Edmonton called ACQBuilt which claims a 1-day set for most single-family homes - as opposed to a 3-day set which Matt got. Perhaps opting for the roof trusses had a large factor in that.

[@ScottRainey]

Didn't Mat say the roof trusses added a bit over a full day, plus prep for the freezing rain?

[@rayauchterlounie4711]

Yeah, this. In fact looking at the video my thoughts are this isn't a pre-bult / pre-fab house at all, just pre-fab wall panels basically. The "pre-built" houses I'm aware of leave the factory as modules that contain all fixtures and fittings (flooring, plumbing, electrics, wall finishing / plastering, kitchens, bathrooms, etc. all done in factory). Crane into place onsite (think they do six houses a day with one crane), hook up services and basically move in (there are some joints to finish as well).

[@MrDeicide1]

@@rayauchterlounie4711 That's called a mobile house

[@alfamaize]

One other interesting thing to me is that the builders continued in poor weather. While you probably didn't see the direct benefit- that does reduce the cost of the building, since it reduces weather related building delays. And being able to build it that fast also helps with catching up with home demand. (among all of the other cool things for this structure)

[@jackielinde7568]

Build while you have the crane onsite. Because it'll cost more every day it sits there unused.

[@themeltingJason]

Matt, I've been loving the videos about your home. I also live in MA and am planning to build a home within the next few years. I would really love some in depth videos of all the rough MEPs, pre-sheetrock, when they are complete. (I'm a plumber by trade and nerd out about everything building science and efficient home building). Thanks again for being willing to share this experience with us!

[@tims8603]

I worked in a modular home plant for 30+ years. The homes we built were almost completely finished before shipping so they were setup in a week or two depending on the type and number of modules (up to 12). They are designed for upper midwest states so they are very tight and well insulated.

[@HCG]

What brand? Would you recommend them?

[@mikefochtman7164]

I bought a modular, it worked out quite well. In the fall, it was hard scheduling the crane (mine was a two-story, with 'four boxes' basically). Friend across the river was like, "One morning we saw some plastic wrapped boxes, that night we saw a house complete with windows/doors/ roofing, siding." Lot to be said for factory construction (mine even had slate stone floors in some of the rooms, installed from factory.)

[@tims8603]

@@HCG I tried to reply to you but it keeps getting deleted. Maybe if I put this. They're made in Marshfield, WI.

[@HCG]

@@tims8603 WI Homes?

[@tims8603]

@@HCG Yes

[@markwellington1254]

My wife and I really want to build a home like you are. These videos are so informative for all aspectts of building a netzero home, or dream in our senior years. I so facinated by the new appliances that are available now and I will look forward to what you put in your home. GeoThermal is what I hold a big interest in, so an episode or two/ three on that would be greatly appreciated!

[@CygnusRising]

For those not building with SIPs-style walls, standard stick frame, ZIP sheathing, and Aerobarrier get astoundingly good air sealing. There's also the TStud, which is a mostly-drop-in replacement for standard studs that vastly reduces thermal bridging.

[@KevinLyda]

Someone watches Matt Risinger's videos... :)

[@CUBETechie]

But is it really a good thing to seal it completely instead of ventilation? Maybe with the chimney effect?

[@pantheis]

@@CUBETechie He very briefly covered that in this video. There is a ventilation system to exchange air, but it recovers the heat from inside before sending the air outside. It was like 5-10 seconds in the video, so no clue how that works. I'm assuming it allows the outgoing air to heat the incoming air to reduce energy loss.

[@cmbakerxx]

@@CUBETechie The idea is to seal the house tightly and control the ventilation with ERV. That way you efficiently ventilate the building to control heat loss, indoor humidity and drafts.

[@KevinLyda]

@@CUBETechie yes. With mechanical ventilation you can pull warm air out of moist rooms (bathrooms and kitchen) and use it to warm up air being pulled in from outside and pushed into the rest of the rooms.

[@papparocket]

I am a little surprised that you didn't include a basement. That would seem to be a relatively cheap way to add space, and with lots of insulation on the outside of the basement walls, a way to ground temper a portion of the house.

[@MrDeicide1]

Why basement? You have potatoes to store?

[@grn1]

@@MrDeicide1 Most houses with a basement will have HVAC, Fuse Box, Water Tanks, ect plus Washer and Dryer all in the basement rather than taking up space in the above ground portions. Basements also add extra storage for any kind of good (holiday stuff, alcohols, non-perishable foods, stuff for guest, whatever). In the US when selling a house basement space isn't supposed to be counted in the square footage of the house (looking for a house myself I've noticed many listings cheat). A house with a basement, especially a finished basement, will usually be worth more than the same square footage house without (since it's supposed to be extra space). One down side to basements is that they are more likely to leak or otherwise breakdown than a house built on a slab alone. That said a lot of the houses I've looked at seem to have issues with the grade (angle/tilt) of the land suggesting insufficient time was given for the land to settle. Combined with people not fixing the grading of the houses and allowing water to get in and under the foundation means there's a whole lot of houses on the market with terrible foundations (and the asking price is as if there were no problems and everything had just been updated with the latest and greatest tech).

[@TheGreyGhost_of43rd]

@@MrDeicide1are you remedial?

[@MrDeicide1]

@@TheGreyGhost_of43rd Nah, I got a doctorate

[@drsaintdc]

I think there is more expense in basements.

[@willpulera7303]

As a residential carpenter and new home builder I can say you went the best route by going with 2x6 walls covered with the zip sheathing. A lot of company's have been using foam for exterior sheathing covered in vinyl siding, both of which you could punch through using your first with no problems so just imagine what a decent thunderstorm could do! I can also tell you that these materials are fine being outside during the couple weeks of framing, in my instance we build the entire house on sight from the foundation up and at most it takes only 2.5 weeks to complete and the roofers to start shingling and that they get done in just a day or day and a half so the house is weather tight within three weeks from start of construction.

[@Frank_W.]

And I wish that my house here in Georgia had 2x6 exterior walls but sadly they generally only do 2x4. 🤯 I would have loved the extra insulation and increased R value.

[@59seank]

I live in a Pulte built home near Chicago. Our previous home was custom built with 2x6 walls, plywood sheathing and double pane windows. We had cedar siding which was a pain because it wouldn't hold stain. We've been in our Pulte home for 17 years. It's built with 2x4 walls and Dow 1" foam sheathing (the corners are OSB with 1/2" Dow sheathing. There are a few places where they had 1x3" cut in bracing. The walls were all built off site. So far, this Pulte house is just as comfortable as our custom built house. High winds don't seem to affect it. My biggest complaint is that our Pulte home is rather transparent to noise. If someone is talking outside I can hear it. When the paper thin vinyl siding heats up and cools down I can hear it inside. Finally, we've had a few houses burn down in my neighborhood. When the vinyl and Dow insulation starts burning it's hard to stop. If the fire makes its way into the truss roof -- game over.

[@grahamstefaan]

Zip is cheap osb. Use plywood and 30# tar paper. Yes 30#.

[@paladain55]

Nobody is using foam for sheathing. They will still be using osb underneath it. Foam is great and is a good way to insulate. Zip even glues it to a lot of their sheathing types.

[@johndododoe1411]

As a European, I am used to the outermost surface being stone, brick or concrete, providing excellent mechanical protection for the insulation and inside rooms. This also adds to the total thickness of walls, thus providing windowsills deep enough to sit sideways between the window and curtains. For prebuilt houses, the outer stone layer is part of the factory delivered walls, thus needing heavier trucks and cranes. Various stuff is cast into the concrete at the factory, including pipes for water and electricity.

[@terryzak1742]

Great Job Matt, My wife and I build a pre-engineered home (Barden Manufacturing), back in 2002. All of the wall panels were manufactured at Barden and shipped to our site, just like yours. We used 2 x 6 framing on all exterior partitions. Insulation was added on-site, using what is called a "Dense-Pak" method. Plumbing, heating, and electrical were all added by conventional means. Our contractor Bear Mountain Builders (Western Massachusetts) encouraged us to purchase a high-efficiency package to reduce air in-leakage. It was a wonderful home and took us 1/2-year of Auto-Cad iterations with Patlin Enterprises to get the 3,700 sq.ft. home with 4-car garage sorted out. In the end, the only change-order we had was a 6-inch extension to an interior kitchen partition at the end of an upper cabinet run. It just looked silly having the partition end 1-inch past the last cabinet. The builder said it was the least amount of changes he'd ever seen in 25+ years of building and specializing in Barden homes. Congratulations to you and your family.

[@88COR88]

Hi Matt, when everything is finished, all the tech in etc., I would be very interested in a full cost breakdown compared to a regular home. My prediction is that it won't be cost justified but that is to be expected when comparing a leading edge technology to a process that has huge benefits of scale and decades of process improvements. I hope you keep your channel going for years and you're willing to do an annual update to see if the cost saving are what was expected as the home ages. I suspect maintenance will be more to maintain the airtight ratings and the leading edge tech will inevitably cost more to maintain BUT late adopters like me really appreciate early adopters for leading the way into the actual use of new tech.

[@SangoProductions213]

It will obviously be enormously more expensive than a regular home. And you'll have to have somewhere else to stay while it's being built. Plain old solar panels would have been just as functional. But when you've got the money, you've got the money. That's why being financially literate and future oriented that is important.

[@RCGache]

Matt, I would be very interested in this also. What is weird to me is why this technology does not experience a serious cost reduction to building a home when built in a factory. I mean, lots of other products that are replicated in large volumes in factories gain lots of cost savings. For example, my intuitive expectation would have been to expect a 50% reduction in the overall cost of a manufactured home. But, I guess it would have already happened (all homes being made in factories) if even a substantive reduction in costs could have been realized (e.g. >20% cost reduction). If you do a video on the economics (please do!) it would be great if you could answer this baffling question. Thanks Matt.

[@ecoKady]

@@RCGache In short, the building materials are much higher quality than a traditional home build and hence cost much more.

[@SangoProductions213]

@@RCGache It's a combination of government and culture, which makes homes have incredible cost, regardless of markets. (TL;DR: home loans, as started by central government, created inflation. A story as old as time.) For many decades now, homes have been seen in the West as investments not as commodities. And... it started with government involvement to get "disadvantaged" people loans to buy homes. A fair and noble goal... But now, someone who could only afford say, a 5,000 dollar home, could now afford a 10, 20, or even 30 thousand dollar home... In small payments overtime. And then, seeing the piles of cash the government offices were making, people offered similar loans. And like that, the availability of capital in the still-limited market ballooned to ridiculous levels. (And because of this rampant price inflation, it became valuable to hold onto property. And thus became an investment vehicle. Which means now people are buying them not just to live in, but to try and put their money to work. Which restricts supply yet further. Plus, most of the West has an addiction to importing foreigners who...surprise, surprise, also want homes.) Meanwhile you can look to other markets where homes are still treated as commodities - as in goods that you expect to use and then throw away. In Japan, as soon as you move into a house, its value drops by the same percentage as driving a car off the lot in America does.

[@tomcoryell]

As I sit here in my drafty conventional stick built home, I am envious! I look forward to updates Matt! Well done! As an aside, a friend of mine was trying to tell me the electric vehicles wouldn’t have good heating. I pointed out that heat from ICE vehicles is a byproduct of their low energy efficiency and that realistically you could turn the heat on in an EV without ever running the motor. Thanks for proving my point!

[@OhHeyTrevorFlowers]

I'm a long time fan of the channel and new home tech in general, so these are great videos for me! I'd love to see a comparison of the overall resources (including roads, water system, etc) that go into building and maintaining this home compared to a green built home in an urban co-living community like the City of Vancouver's Olympic Village.

[@knightwolf3511]

new home technology is pretty much Proprietary and also welcome to nightmares and hell unless Matt Ferrell goes with one brand and uses the cloud system of theres, trying to get none Proprietary, with none cloud and as well local mainly setup is a nightmare

[@paulsylvester1394]

Fantastic video. And boy do I understand the semi panic moments. They sometimes come because you know too much but don’t have enough first hand experience with the issue in question. In my case, my wife blames it on “engineer’s disease! One of my favorite parts of this is that your experience, climate and other issues, is applicable to me as I am not far from you being 10 minutes north of Boston. Keep up the great work! Wishing you all the best!

[@amosjoannides]

Seems like a wonderful process. We are planning our home here in Canada, and this approach is very appealing. The more technical, specific your vids, the more helpful, so keep bringing it all on!

[@altdeadpool8509]

Everything looks good! I hope it doesn't take too long before you can move in. I had a couple questions about your plans for your house. Are you planning on installing a rain catchment system to go more off grid? If so, are you planning on having your tanks underground or over and why? Do you plan on using a wind turbine of any kind on your property for extra power? Do you plan on having a greenhouse? And just in case you haven't done so already, make sure you secure your water and mineral rights to ensure you don't have anyone trying to mess up your land. Can't wait for an update!

[@Barbaralee1205]

Great video. Love your house. My 4000 sq ft shop is no match for energy efficiency but my Amish neighbors put it up from start to finish in 4 days. 😄. To be fair, there were 30 of them and they are crazy good at working together and building fast.

[@johnkeck]

Did they build it for electricity? lol

[@Barbaralee1205]

@@johnkeck no but an electrician came in later and installed on outside of walls. It’s a shop so we didn’t care.

[@Carl_in_AZ]

Twenty years ago in Minnesota, I was involved in air-tight homes. The issue we ran into over time was moisture build-up. We worked with Broan/NuTone and others to add ground air exchangers. Some builders made them so airtight indoor bathroom odors also become an issue without an air exchanger. Some devleopers guaranteed NG heating bills below $150/year.

[@johnkelley1426]

Matt, the best part of your series is that you are a master communicator. That's a rare, hghly undervalued knowledge and skill for a geek. Never lose that. You ought to love your Waterfurnace. We retro fit one in our 2d-hand Enercept house that was built in 1996. I'm considering using the 2023 tax credits to upgrade my leaky 'made in Carolina' windows with Alpen's Tyrol Series (a more local source for me than is Logic).

[@albertobravo]

I would love a video of all of the costs of the project from beginning to end, including some hidden costs like stuff you did on your own (because of your knowledge) that others may have to pay for. It would be nice to know how it compares to buying a new build in traditional fashion. Great video!

[@482jpsquared]

Remember to evaluate the long-term costs of ownership, not just the short-term construction costs. It's like owning a Tesla vs an ICE car. Think long term.

[@albertobravo]

@@482jpsquared Oh absolutely agree with you. I just really like Matt's detailed cost videos and I think this particular one would be incredibly valuable.

[@Keith80027]

Your are building the house I wanted to build in 1976 when I was a brand new electrical engineer working for IBM and was shocked at the cost of cooling a house in Austin Tx. I started looking at solar and geothermal for cooling my house because the cost of AC was too much. I moved to Colorado and looked at building a berm house. What you are doing is really a great step in building an efficient house. Love your other videos too.

[@alansterling3481]

Your geothermal install should be very fascinating to me. I am very curious as to what size the system will be and what type of loop system will be put in. I plan on retiring to Minnesota in the near future and going geothermal with a passive home seems like the best long term situation. Also, the ERV could use some explaining. I don't think many people understand the need for them.

[@eliinthewolverinestate6729]

We used to build sip houses, but fire rating so don't no more. We build passive solar masonry houses now. Usually D.C. electric because more energy efficient and long term cost. We go R60 in floors and roof. We over engineer for solar gain. We use a wick style system for moisture. To keep it drawing moisture out. We use exposed trusses with insulation on top of ceiling finish. That's usual weather to build in. We use thermal breaks around windows. We don't use forced air either for heating. Been doing a lot of off grid work.

[@papparocket]

Matt, if your house is still at the stage before the interior is finished, I highly encourage you to check out this video from Matt Risinger's channel for an aerosolized caulking system that uses the leaking air itself to entrain caulk droplets so fine that they stay suspended in the air to find and fill even the tiniest of gaps. In this video Matt Risinger was using this system to seal his own house to try to get it down to the passive house standard of an ACH50 of less than 0.6. Now this house was entirely built on-site with different trades coming in and say drilling a hole for an electrical cable that penetrates through the envelope that they don't mark for caulking, so it doesn't benefit from the highly automated and repeatable process, including the taping and caulking, of a factory built house. The result was that he started out with a pressure door test giving ACH50 of 1.14 despite trying to find and fill every gap and hole they could to make the house as airtight as possible. But after the aerosolized caulking process fill all the tiny gaps the ACH50 rating dropped to 0.1. So while an ACH50 rating of 0.54 for your house is AWESOME, you could potentially drop that even more. Note, I have no involvement with this company or Matt Risinger. It is just that as an engineer, I love really good engineering solutions that take a new and highly creative approach to solving important problems, and in my opinion, this is a great solution to getting houses, even existing houses, sealed just about as tight as is physically possible. Here is a link to the video at the point where they rerun the blower door test showing the before and after ACH50 numbers. From the description of the company representative, this method can be used on existing houses. The issue is that it would take a lot more prep to cover all of the horizontal surfaces since there is some settling and so it would be a bit more expensive. The recommendation is for an existing house, the best time to do it is just before moving in when the house is completely empty. But it sounds like they can also deal with a house that is currently occupied, but again it would require even more prep and thus cost more. At some point soon, I am going to see if this can be done for my old 1950s house that currently leaks so badly that I am afraid to get a blower door test to confirm just how bad it is. kzbin.info/www/bejne/gIrYmJyJrLyihs0

[@chazdomingo475]

That sounds like a nightmare for your lungs.

[@papparocket]

@@chazdomingo475 That is why people generally aren't inside during the processes. And if anybody has to be, they wear a respirator that will filter out the droplets. And even if a little gets in your lungs, it won't like coat the entire inside of your lungs. Likely it the droplets will stick in the mucus layer and the travel out of the lungs along with all of the other gunk that we breathe in.

[@chazdomingo475]

@@papparocket I watched the vid and it seems like the caulk precipitates out of the air once the house is depressurized.

[@papparocket]

@@chazdomingo475 Most likely they open a door or window before turning off the blower door so that most of the caulk suspended in the air is blow out of the house before much of it can settle. But for sure some of it likely does settle out. That is why this process is best done immediately after the envelope of the house is sealed as best as can be done with conventional taping and caulking, but before finished flooring, drywall or things like cabinets and countertops are installed. Then if some caulk gets on the subfloor or sill plates of the walls it isn't an issue. Like the guy from the company said, this process can be done in an existing house, but it takes a lot more prep, and thus a much higher cost, to cover the floors, countertops and any other finished horizontal surface so that the caulk that does settle out doesn't get on these surfaces. The cost probably gets pretty steep if the house is also fully occupied since all the furniture would also have to be protected or moved out of the house while the process is being done.

[@rjtumble]

Super exciting, congratulations Matt! Thanks for taking us along for the ride. Unity is definitely on my list of places to, we're at the early stages of building a house for ourselves.

[@brendenmonahan99]

Congrats Matt! House is looking great. I hope to acquire land and start the process (some day). Very interested in geothermal heating and what do you expect your daily energy consumption to be. Keep up the great work.

[@schnitznschnatzn]

I'm glad to see that this is picking up in the US. My parents had one of these "Fertigteilhaus" built in Germany in 1996. It took one day to set the walls and another day to put the roof on, including the clay shingles. They also had a solar water heater installed with 3 panels on the roof that work flawlessly to this day and provide hot water for most of the year, even at 51 degrees latitude. When I moved to North Carolina in 2006 I was a bit shocked to see how much energy it takes to pump the heat out of a stick built house, only to burn more gas or electricity to heat up the water for a hot shower. I really wonder why solar water heaters aren't a widespread thing, especially in the southern US.

[@SecretCollage]

Sadly, is cuz of politics most likely.

[@ijc9837]

Honestly, I really want to see every aspect of your house build. Even the interior decore. This is something I am very passionate about and hope to be able to do one day.

[@MarkHarlan]

Congrats on getting walls up! I'm sure that's a massive relief after all the work you've put in so far

[@unknownvalor9755]

If you get enough sunlight solar water heater combined with electric tankless it's pretty amazing. I have a duda solar water heater with a 40 gallon tank on top. The water is fed into a thermal value which regulates hot water down to 123 F. This water is fed into the tankless which will heat anything below 122. During the winter the solar water heater will keep the water closer to 100 F, which will cause the tankless to draw very little power. ( 2/3s of the year my tankless is pretty much off )

[@loaffloaff]

A Q&A video would be great. Does it/can it have a basement? Also, wondering if you will do the insulation technique, when the house is a white box, that sprays aerosolized plaster-like material that are then air blown to seal any small gaps.

[@Jehty_]

Why shouldn't it be able to have a basement?

[@482jpsquared]

@@Jehty_ He totally can have a basement, but appears to have chosen not to. We built a factory-built home in MA with a full basement (ICF forms for the foundation of course.)

[@suzithewitch]

I live in a factory built house that's larger than the traditional stick built house we used to live in. The new house is larger and all electric, but our energy costs are down from $600 a month to $200 a month (peak for each). We're also using a heat pump for both heating and cooling and our energy costs are far below other houses in our area. What I really want next is a whole house battery system, but I don't really see how I'll ever be able to afford that. But I keep my ears open, just in case changes happen :)

[@MichaelAussie05]

This is a brilliant series. I am engrossed in this process. Thanks Matt for your time and efforts on this thoroughly entertaining and informative series. Cheers.

[@mas13ish1]

I love how transparent you have been about your whole home build. It looks great!

[@esteban8681]

Quick question, was the decision to not have a basement a choice to save on costs or are you not able to have a basement with this type of build? I don't see why you wouldnt be able to but i have yet to see one on a modular home build. Congrats on your home btw.

[@jasonallison8946]

I'm wondering this too. I'm starting to think that basements are less common than I'm accustomed to.

[@stepmback]

I would like to know as well. Why no finished basement?

[@tims8603]

A lot depends on where the house is located. Here in WI, a basement is almost required due to sub zero F temps in winter and possibilities of tornadoes. Some parts of the US, basements are not common. Almost any house can be built on a basement or crawl space but there is added cost.

[@cmbakerxx]

I'm not sure Matt's reason for not building a basement. In New England basements are common but also not feasible in many locations due to bedrock or water tables. Not building a basement does simplify the insulation and air sealing, and saves considerably on the "carbon" costs for building the house due to using much less concrete and energy to excavate.

[@kevinguthrie5495]

I was wondering the same thing. Is there something about basements that makes a house inefficient?

[@r.j.bedore9884]

Matt, I would love to see a video talking more about your geothermal heat pump and how you chose the model you did, and also what kind of ground loop installation you're doing. I've seen lots of videos on KZbin from people installing air-source heat pumps, but not much on geothermal heat pumps. With the geothermal being capable of operating efficiently at a wider range of temperatures I would like to know more about the cost difference compared to an air-source unit and any extra considerations that need to be taken into account.

[@TheMrg59]

I'm looking to sell my house and move some time in the 2026 Calendar year, and your videos & breakdowns are a big contributing factor to my wife and I planning to look into Unity homes as a possibility. I LOVE the idea of going with a passive house design, but I don't know if the finances will be there for us. Hoping to really start serious planning end of 2023/early 2024. Your videos have been an inspiration, thank you.

[@jaymacpherson8167]

Matt, are the walls built with conduit to run cable in the future? For instance, I prefer Ethernet to wireless and that can be challenging in a structure that doesn’t have available conduit to run cables. When designing remediation systems, we would recommend the owner pay for 1 extra pipe run parallel to the design runs. It did not add much to the total cost, and at sites were change or expansion became necessary, those unused pipe runs were very useful.

[@jasonallison8946]

Learning a lot from your experience. Thanks so much for sharing it. Can't wait to build a passive house for my wife and I.

[@Flowing23]

Excellent video, thank you. A question if I may. I'm a little confused with your foundation system. Why was it necessary to dig down what looks like 6 to 8 feet install a footing and then install a foundation wall with a concrete slab on top. Given the fact that you ended up with a concrete slab was it not possible to do slab on grade, concrete with some reinforcing steel. This would have saved the cost and time for excavating and installing foundation walls. Or, did you have a specific reason for this. Thank you.

[@david100483]

Your new home is looking great! Did you consider building your home over a basement? Just curious if it was due to energy savings. I’m thinking about building a ranch and I feel I would build one with a basement, mainly for added storage and a finished man-cave/family room.

[@douglaswindsor120]

A basement is a very logical idea it adds minimal cost to the building and means for a very low cost of adding more space later this was made clear to me by a church I attended the original church was built on slab and when an addition was needed it was an expensive project but they were smart enough to have a basement under so when a second addition was needed later they finished the basement same square footage of additional space at 25 % of the cost now it cost more for putting a basement under because of codes needing them to be insulated but what's added upfront is taken off the cost to finish the basement as additional living space

[@johndododoe1411]

@@douglaswindsor120 Adding a basement under an existing house is also a practical problem as you will have to dig up the foundation without removing the house. Foundations built to contain a basement are dug deeper by at least the height of the extra rooms and place the weight of the house and all its parts on a structure just like that of an upper floor. No problem with the weight of the kitchen stove being supported by the ground under the kitchen and sinking into the ground at a different speed (inches per century) than the walls. Similarly all the plumbing will be routed to allow for the basement to function. Now building an unfinished and unfurnished basement instead of completing the basement from the start is a saving in case it's never needed.

[@davidjewell6782]

Long-time watcher; first time responder. I love your presentation and your energy, and your house is amazing. Have you ever considered dome homes? They are fire-proof, termite-proof, and have R values of over 100. My wife and I are retiring in two years, and we are thinking a dome is in our future. We do not want a lot of upkeep in our golden years. Keep up the great work, and I look forward to your next video.

[@brett4264]

Nice looking home Matt. If I'm ever in the market, I'm definitely going to consider this option.

[@alhelin]

Great video. I ordered my house in similar manner here in Finland 7 year ago. have to say, here we are a bit ahead on this. In one day my house was covered from weather and the walls came ready made also inside, not only external insulation. Outside and inside only paint (and putty inside) is needed. Great to see that also in US the factory building is getting popular!

[@_TbT_]

As a European with triple glazed „European style“ windows and windowed doors, I can highly recommend those windows and totally get why Matt is so in love with them. They changed our 70 year old house from something heavily leaking warmth to the environment to something cozy. It is not only the temperature, that triple glazing does wonders concerning noise. I had construction going on outside and was able to sleep inside. And to be open those glass doors to the outside is nice in the summer. They and the windows just feel sturdy. In Europe, plastic windows are the cheapest, wood windows however look nicer but don’t last that long and wood windows with Aluminium outdoor shielding are imho the best (but also most expensive). Our wood Alu windows are 20 years old, but look and work like if it was the first day.

[@lancemillward1912]

Factory built for consistency is great. These systems are very material heavy often with a lot of foam, plastic and other materials that are difficult to recycle. The lifetime cost of the material includes the disposal cost at the other end. Looking great. Looking forward to some deck, fence and landscaping videos. As a landscape architect from New Zealand.

[@davidc-l9174]

Very cool!! We did a custom modular home last year. The neighbors in our rural area were coming from far and wide to see what all the commotion was about. Foundation went up in one day, house went up in one day. It was crazy. Looking forward to more of your house videos!

[@eidrag]

wow that's amazing! Imagine going out of town in weekend and come back seeing new house completely built (from outside at least)

[@LoanwordEggcorn]

Sort of like a factory-based barn raising! Nothing wrong with the community being in the form of a factory.

[@melodypiercy7588]

I love watching your videos!! I’ve been watching them for a few years now. I’ve been super excited to see your latest videos on building net zero, geothermal, and solar. I’m planning on building and this is the path I want to take! I was nervous about the different processes, finding the right people/contractors/companies etc but your videos explain everything so well and easily that it’s made a huge difference!! Thank you and keep up the great work!

[@BrettMoore66]

I think you should make an entire website about your build so you can point out all of the benefits and cool things that make your new home great. I would love to see that.

[@UndecidedMF]

Good idea!

[@craigescapeddetroit5198]

I like your manufactured home. Nice choice. When I had a garage built some years ago, the contractor who dug the foundation, and prior to them pouring the concrete, he was very surprised when I laid sheets of 1 inch foam board into the trenches along the OUTSIDE walls. He got excited when I explained that this will greatly help to pull up the ground heat into the building during the winter, and reduce thermal cycling structural movements. This extra warmth will also help to reduce condensation on the floor. I also set large 1" steel eye bolts into the wet concrete at all four corners. He asked WHY? I explained: To install heavy duty chains for securing important things, like trailers, tool chests, motorcycles, big air compressors, etc. (Thefts from garages are a problem in every nation, and my little security measure will help to prevent any such BS.) I tried to insist on Sheet Metal Roofing (because it lasts from 75-100 years AND is Fireproof from falling sparks from other fires), but nobody in the area offered it). So I went with the white, 40 year Architectural shingles AND then I got up there and applied 2 coats of 20 year, exterior, white house paint. Why? To insure that I will never need to pay for a re-shingle job for at least 60 years. (Reroofing jobs typically cost 400% more than the original prices, so a little extra money now will save TENS of thousands in the future.)

[@steverobinson5492]

Thank you Matt. We have been following Unity Homes for some time now. Interesting to see your project coming together. Very much interested in future vids detailing the performance of the building. Cheers and congratulations!!!

[@egood4531]

One area that I am interested in has to do with the bathroom. At Epcot they had/have a display that uses shower water drain to preheat hot water tank water. The same system was used to use waste shower water to to flush toilets which was suppose to cut water usage by 20% to 33%. Since utilities are moving to purchasing power at wholesale rates, would a solar storage battery below the garage be a consideration. Heat in summer and use in winter like polar ... battery. Assume your using ground loop heat pump to be all electric.

[@jonesgang]

I had friends that purchased a prefab house and it was amazing. It took very little to keep it warm during the winter and cool during the summer. And this was back in the mid 80's so I can only imagine how much better they have become.

[@erickessler6094]

Matt, I'm so excited to see you finally at this phase! I love your choice of panelized design contractor! I love blower door tests! 🤪 Quantifying the results along the process is critical, as you know. One of my biggest blower door challenges was all the plumbing, electrical, and appliance air leaks. Haha, everything from sink drain traps, sealing ERV & Make-Up Air intakes/exhausts, whole house vacuum, range hood & dryer exhausts. 😆 Just like you, it was fun and exciting! Cheers, Eric

[@heyitsmepatg330]

Please discuss the financial planning requirements for a build like this. I’m interest in how the planning and sequencing worked, and how you managed financing (if any) around a non-conventional house construction. I’m also curious how you got around traditional incumbency in the construction industry to get all the features you wanted (.i.e passive house, heat pump, solar energy, etc). Did you consider non-detached single family home structure at any point? Did you learn anything about how a simile effort could be done for a duplex, townhome, or other small residential structure? Do you think you’ll build an ADU? I appreciate these videos! Please organize as a list for others that want to follow in your footsteps

[@dvanremortel]

Matt that was exciting to see. Hope you share the specific product / manufacturers you're using. We are not building a new home but this old country home (140 yrs) needs some TLC and some of the elements you are adding I'd like to add too. Happy House Building

[@whatmust8146]

This is the way to go and they should change and do this for the whole country. Make sense and very smart! There is no way the traditional way of stick build can compete with this. This method is efficient, little waste, faster, cheaper and a bunch of other advantages over the traditional slow, wasteful and costly sick built. I will do the same on my next new home built similar to our approach because you are doing what i want to do to. Thank you for sharing.

[@mattiaarnio9249]

I ordered a factory built house - much alike yours - 7 years ago, and moved in about 11 months after digging started. This is not a "passive house", but quite efficient nevertheless. In southern Finland we have had proper winters, and this year we have this cool season with occasional snow. Nordic standard on windows is argon filled sealed triplex glass panel inside, and single glass pane outside.

[@masterofthepinkside]

we're (it'll be my partner's house) thinking of building a passive home in a year or so and don't have a factory kitset option in my country, so it'd be great to hear more about options for things like the the air exchanger, heating and cooling, hot water... and also how your power setup works and what's required for that.

[@TerryE-UK]

We've got a UK self-build using a similar larson strut cassette system based on my plans. The main difference was the TF was factory-assembled without insulation and a specialist company did the window and door installation on day 8-9 of the build, but all was weather tight and lockable by day 10. A separate crew did the blown cellulosic fill and taping up on-site a few months later after we had the slate roof on and finished. 0.58 ACH on first test; 0.4 ish after some tweaks (some of the windows closers needed slightly tightening. UK layout: so 2 full storeys + a warm roof bedsit for my live-in son. Cotswold stone exterior skin for looks and to keep the local planning permit guys happy. Like you electric only, low energy. The main thing to watch out for in 1st and 2nd fit is tradesmen screwing up your air tightness: we banned all trades from cutting into it and where needed we added through-panel access pipes (properly sealed) for the trades to run plumbing, electrics, etc. then foamed and silliconed these ourselves, before plastering out / decoration. In everything: trust but verify -- before it is too late to remedy cock-ups. 😊

[@patrickholmes001]

You had the best winter possible for building a house in New England this year. We've had some rain, but hardly any snow. When my neighbors house was built they had to shovel out the first floor every morning for a week straight while they were trying to get the second floor built - then do it all over again until they could get the roof on.

[@billcunningham8485]

I apologize if you covered this - did you put PEX tubes in the concrete to heat the floor with hydronic heat - even as a supplement? Very interesting project. Thank you for documenting and sharing your experience. I look forward to learning a ton from you around this topic.

[@johnh3095]

All houses should be built this way! Old school might cut it somewhere, but a passive house or near as dang it should be a standard we strive for! Love the videos Matt, be interesting to see if you choose underfloor heating as it's a winner on every level if do e right!

[@brian5762]

Currently working on both the windows and insulation aspects on my old house remodel. Windows being replaced with similar type and adding rock wool exterior insulation. The insulation is consisting of Rock Wool Comfort board panels which allows an near thermal break.

[@MCP647]

I really hope you do an in depth video on your geothermal system, and what lead you to it, and all there is to know about it!

[@ThomasLeonard454]

Glad to see you being a part of the build, it is exciting.

[@brucemc]

Great videos, thanks for sharing ! I have a back ground in engineering so I get the process and you are building an awesome home ! We have a company here in SW Ontario called Royal Homes and they do this. Having spent time on commercial constructions sites through the seasons factory built homes are such a great idea ! Love your explanations for the people who don't know about this, we need more homes like this.

[@laulaja-7186]

Stuff I would like to know more about. 1.) Cost breakdowns 2.) Moisture/ mould suppression techniques especially in the heat exchanger 3.) Is this type of build good for allergy sufferers? 4.) How much expense and feature change was required by local building codes or HOA versus what you actually wanted? 4.) Any subsystems that are fully off-grid, and do they save you money vice the on-grid alternative? 5.) Is your Tesla gonna integrate with the home power system?

[@ericbrammer2245]

Having worked as a 'Draftsman' (back-when, Ink was on Mylar per-a-plan) for Northern Energy Homes, I can appreciate this Build! Put it 'in it's place', and enjoy that you have (hopefully) met your goals on Energy Consumption. I'd add, You may want to look into a 'Deep-Drilled' Well, to have Water when the Town doesn't. And, an LP-gas Generator (and one Stove on that LP line!), as power back-up. Welcome to New-England weather! Wait ten minutes, if you don't like it; it'll Change, for the Worse.

[@abramzacharias1]

Thanks!

[@UndecidedMF]

Thanks so much!

[@Evolved_Skeptic]

I live in Australia, so mostly want to know that the tech will function at the other end of the livable thermal spectrum - very hot environments. Even where I live in a South-Western city of Australia, we still get times when the cool sea breeze just doesn't compensate for days of 40°C heat. Generally modern housing is built to an R2.0 wall & R3.5 ceiling standards, relying of air conditioning to compensate for temperature extremes - though this is improving as newer, less power intensive, heating/cooling tech becomes cheaper. Having locally prefabbed housing made to the levels of insulation you've described would be awesome. Assuming they could also be insect & especially bushfire resistent, too...

[@ollimacp]

Matt I'd like to see the layout of the power & networkconduits, fresh and wastewater. How you want to keep it clean and slick while guarantee upgradabillity? Are you gonna install a heatpump waterstorage tank to lower roomtemp in appliances-rooms such as Heating or server & IT stuff, while using the wasteheat for warm water?

[@Aberger789]

I'm in the process of building a modular construction home. We are very early, but have the design done, and are still working out permitting etc. One surprise I had was that our builder informed us that they could not do slab on grade for the foundation, and that basement or crawlspace is necessary. When I saw that your modular assembly was done at the wall level and not 3-dimensional level, I guess that enables a lot more flexibility for foundation choice. We had to design based on Min/Maxing factory module limits (L x W that is). When they ship it, they will have to unload ~ 15' x 40' modules, and in that case, I was informed slab would not work in that case. Was that ever a topic of discussion with your experience, Matt? (I have 0 expectation that you will answer, but I'm just throwing this out here)

[@DavidMartsolf]

Regarding advances in construction, two additional services worth viewing are "B1M" and "Tomorrow's Build". Topics strictly related to architecture are deftly presented by Stewart Hicks. Matt Ferrell is of course tops!

[@Xyphon99999]

Would love to see your planning and layout for networking cables through the new house to fully cover the normal needs as well as all the smart home appliances.

[@badreligion5231]

I have that same Geo thermal unit (3 ton) Waterfurnace 5 series . Have had it about 9 years and love it. Definitely opt for the better thermostat, as it will track how much electric it is using. Mine uses about 15 bucks worth of electric per month to keep my house at 70 here in Northeast PA. Also is waaay more efficient when using it for cooling in the summer.

[@Peter-Casey]

The high point ( frame / section ) of a tilt & turn window is towards the outside as they open in While suitable for mainland EU not so good for Ireland with plenty of wind / rain from Atlantic Ocean Open out windows suit us better weather wise as said up-stand of window frame is towards the inside & they rarely leak or be draughty & hence get a better weather rating here & the all around locking mechanism is tricker to deal with Enjoying the build & best of luck to ye guys

[@johncartwright4562]

I work for a double / triple glazing manufacturer in the UK and those u-values for the windows are insanely low. Would love a breakdown on the configuration of the glass they used and if the 0.15 & 0.13 is just the glass u-value or the whole window u-value.

[@trind6]

I would love to know more about the windows as well, since seams like extremely good u-value :=) In Sweden we only need around 0.8 for passive houses.

[@robertboman5950]

Stumbled across this video and thought the same thing, apparently its a different value in imperial units and 0.14 in imperial equals 0.80 in metric

[@robertboman5950]

@@trind6 They are using freedom units (imperial) and 0.14 equals 0.8 in Sweden

[@CatCaretakerID]

I'm looking for a lot now and just started communicating via email with Unity Homes. I am looking at a couple of other options as well. My budget is fairly small and tight, so price will be a big factor, but my hope is a well-built house with little or no utility bills that I can age out in. I am loving what is going on in the prefab industry right now. Can't wait to see how your build goes - thanks for sharing.

[@chrisagiddings]

I'm really interested in the airflow efficiency. IIRC way back when, homes used to be built for an efficient flow of natural air, achieving a nice breeze effect. With the advent of forced air systems, this has largely gone away, but here in the midwest could/would seriously reduce some energy costs associated with running HVAC systems just to avoid stale air, or overly recycled air. With your prebuilt home design, how well do you expect air to flow during the warmer months of the year? Thanks, as always, for such patient and descriptive content.

[@SpaceSailor-tu3vl]

I believe this method of building is a plus , I have a question about your concern about the insulation, one video showed the factory installing it however at 12:53 overhead shot showed just bare studded and sheathed walls?

[@wizardofhyd]

Good progress Matt, I’d love to see the geothermal system install video, when you get to that part of the project and also some details on why you chose that particular system.

[@Tommy6860]

Happy for you and your wife. Can't wait to see the finished product and it's efficiency.

[@NikolaEngineering]

So cool! I have a SIP panel home, Ground Source Heat Pump, HRV, solar. One of the biggest energy savers is a heat pump water heater.

[@blackoak4978]

It's kinda fascinating how we went from building with big fat walls, because that was the only way to make them stand up, to building these really skinny walls because it was cheaper, to now building big fat walls again because it's cheaper over time. Another way of saying it is standard building has the internal part of the wall being load bearing with insulation and sheeting being tacked on and within. With this system you have the load bearing wall with insulation and sheeting and then you have the internal wall tacked on

[@rickrandazzo]

I had a factory built home done in 1986. Just like yours, they brought the walls in on a flatbed and put them up with a crane. It was one of the best houses I've ever had. Mostly because of the solar orientation. I do miss that house but not the West Texas desert!!!

[@robertroberts5218]

How much insulation went under the basement slab and walls? Did you test for Radon in the basement pit soil? Did you need to install Radon ventilation. This can be very high in your part of MA. I built prefab homes as a kid summer job and they were better in some aspects but nothing compared to what you have here. You can do a sealant fog at the end to seal the multitude of tiny holes very easily. It is worth the effort. Go for as low a number as you can, 0.15. Air tightness only degrades (slowly) over time. It will never be better than the day they hand you the keys.

[@EE-su7mb]

Hi Matt, this is so awesome! I'm from Germany and 10 years ago I also built my passive home with a prefab company (Bien-Zenker, Oikos Group). I went through exactly the same process and experienced the same excitements as you did along the path! So it was super awesome to see your video :) I work at Samsung Electronics and we are focusing heavily on Net Zero Home IoT solutions, offering Samsung HVAC + Home Appliances + PV + ESS + EV and IoT to builders (powered by our SmartThings IoT platform). So i'm particularly very interested in seeing your journey and how your house evolves! :) Hope to to stay in touch with you.

[@markdavis8888]

Energy costs me less than $3000 per year for my conventional 2500 sf house located at 4500 feet in the Cascades mountains. I do have a wood stove and I cut my own wood. In 20 years that has been maybe $60,000 in total costs. My maintenance costs have been just a new air filter once a year. I think alternative heating and cooling are for the rich or subsidized and can't be justified financially. I do have in-floor electric resistance heat in two bathrooms and I wonder how this compares to a mini split. The resistance heat provides less heat per kwh but less heat is needed to be comfortable since it only heats the floor and not the walls or ceiling. In a bathroom a heated floor is awesome.

[@StevenYu]

Love to see you build from theory, planning, and now a reality. Thank you!

[@purplepeoplesparty2368]

Very interested in the tech that is built in. What, why and how the tech that was chosen. What, why and how can and will these built-ins be updated over time. etc. etc. Best video of a factory built I've seen. My eyes glaze over quickly with manufacture videos that are pure sales.