How Does Energy Recovery Ventilation Work? | This Old House

[@jwahrenburgrhahvac4107]

Could not have been done easier than this. Great video!

[@paulcochran1721]

Little did he know, but Richard just called in an air strike.

[@davidsquall351]

lol

[@holymoly8718]

this is old house actual! reinforce at phase line yellow! plus one strike three! fire concentration charlie! drop 200, left 100! FIRE FOR EFFECT! OVER!

[@Patrick33456]

I just spit out my tea to this 4 years later. Thank you friend LOL

[@ZombielandPB]

Oh my gosh thank you for explaining this properly. I spent about 20 minutes trying to find a video for someone to watch rather me type it out explaining it how it works. So many videos did not explain what a heat recovery unit does when the title says it right in the topic. Thank you.m

[@Chupria]

Wow, this guy goes straight for it. I always wonder if the air mixed, now I know. Thank you.

[@keithhupp5995]

Awesome video. You took smoke to the face just for us. Much appreciated!

[@macsmith1]

I just love how simple they make things

[@Shadkow]

I love this type of thing, super interesting!

[@MrGoodtime1301]

Best explanation of an ERV that I found

[@holymoly8718]

OMG i understand now!

[@patsempervirens]

I’ve never seen this kind of baby gender reveal before

[@georgedoolittle9015]

Have already paid for that heat absolutely 😊

[@eagle4life69]

Keep the videos coming I love them

[@DuncanCunningham]

Great demo Richard.

[@lastdon6585]

Very well explained

[@Soothsayer210]

nice explanations. Thx for the Video.

[@Maxejage]

Thank you

[@VP411Designs]

Awesome helpful content thank you

[@Commonsensenotsocommon]

Great vid, thank you

[@martylynchian8628]

I live in South Florida, I need hot humid air outside and dry cold air inside. Will this magic box do this?

[@internetshaquille]

insane

[@bryanjclark]

omg finding a net shaq comment in the wild, hell yeah brother

[@joehanna2231]

very nice

[@robertouser674]

What a good video!

[@senjin88]

Thanks, finally found a video that showed how the channels pass without air collide .

[@nickvuong4260]

Thank you for this info. Do The in flow and out flow ducts need to be insulated ducts or no since the ERV does the temp exchanging too?

[@darrenchang2907]

Looks like a magician at a carnival!

[@Thomas-ts2gl]

Great idea!! But what about mold?

[@meowzic]

I would like to purify air especially during fhe winter and controlling humidity would be nice during rhe winter.. wonder if this does that?

[@paulbragin5034]

Do you have any noticeable sound from the vents inside the living space and sound with the unit running from the floor below?

[@ralphiewyowyo]

We live in the upper Midwest. Hot humid summers and brutal cold winters. What % of the time do I run my system in each season? More in summer, less in winter??

[@Bart-dg6qv]

It suppose to work 24/7. Non stop. But it only make sense in house with European style windows and insulated from the outside. No need to use it in typical stick US house.

[@iBringTheRain24]

That's some awesome technology

[@Guillotines_For_Globalists]

Do they really not mix? The color looked different. Also, does the core have to be replaced? Is there a secondary filter to remove the outdoor dust and containments? How much does the core cost if so? I know these HRVs can vary quite a lot in size depending on how many square feet they are intended for.

[@jdaza1987]

Great questions

[@ayoubfarid1663]

You just need to clean the core thoroughly once a year. The core is a big square-ish looking plastic filter which isn't that expensive and is quite easy to remove and clean. My HRV manual says to replace the core every 5 years

[@steadyeddie7453]

I believe this system in the video is an ERV, not an HRV. There is a difference. An HRV is similar but does not control humidity. Someone correct me if I am wrong.

[@roboticbrenden7764]

Wow I thought it would mix.

[@Mxy-ff4zk]

I had my doubts until I saw the red and blue

[@ae1ae2]

What other technology is being used here besides convection / conduction? If that was all that's going on, then the numbers shown at 1:08 don't make sense. If there is cold air outside and warm air inside, we can get close to the same temperature in the fresh and exhaust air from convection / conduction, but I don't see how we the heat almost fully gets transferred from one set of air from the other. At best, the fresh and exhaust should be the same if only convection / conduction, right?

[@dianamorales6657]

Who do you call to do this job ?

[@wkm001]

In the video thumbnail I thought it was chalk line chalk. LOL

[@_the1mikeod]

Would I need to install a unit like this to help with moisture on the windows in the winter time? I live in south east Wisconsin. The home is only 1 year old. We have condensation on the windows when we get up in the morning. Humidity levels are upper 40s low 50s in the house during the winter time.

[@ReallyericaTj]

It sounds like you need a dehumidifier! Rather than humidity or moisture control, ventilation (bringing in fresh outdoor air and exhausting stale/contaminated indoor air) is the purpose of an energy recovery ventilation system like the one shown in this video. However, if you are indeed looking to install a ventilation system, this is the sort you would want to use if you are already dealing with humidity/moisture problems! Other types of ventilation systems do not remove moisture from incoming air and would potentially *increase* the amount of moisture in your home. www.energy.gov/energysaver/weatherize/ventilation/whole-house-ventilation

[@sophialeticia7141]

We live in Wisconsin as well. Have this same problem in our home. Just installed this unit. And the condensation on the windows is gone. We have 4 different people tell us this is what we needed.

[@DaveBoxBG]

I am assuming that the "core" works as a filter too and will have to be replace as a consumable? Right?

[@Martin71209]

I believe there are replaceable filters which filter incoming outside air to remove pollen etc. and also filters on the exhaust inside air side, before it enters the core to prevent dust, pet hair etc. clogging up the core.

[@851995STARGATE]

@@Martin71209 yep exactly, we are brow a generic filtret in ours

[@arifbabulotapalkatti7643]

What is air relief valve in this system

[@pfx245]

Cleaning my HRV right now and watching this video. Air filters and main element sitting in soapy water.

[@Engineer9736]

0:59 Are the birds flying into a sunset required to make the core work?

[@ahkeen]

How do you install one of these?

[@northeastcorals]

Do they actually transfer humidity or is it just that a change in air temp changes the Relative Humidity of the air, due to how much moisture air can hold at a given temp? Genuine question as I don't understand how something can be airtight to stop air mixing but also transfer humidity ✌

[@fortunatedad7695]

I was looking for a way to heat up my fresh air so the air wasn't so cold going into my return thus making my furnace work harder. Any suggestions? As I don't have my bathroom exhaust piped to my basement like I would need for this type of unit.

[@fortunatedad7695]

@johnlastname4611 you must be american with a nice warm attic. I'm in Alberta and our attics are almost as cold as the outside and we don't typically have nice easy access to them either. It looks like I would have to already have this piped in or do a major reno that would cost a huge amount of money and not justify the cost. Thanks away 👍

[@fortunatedad7695]

@@johnlastname4611 that's a resourceful idea. Thanks! Can't tackle this till later this year, but I will definitely keep this in mind.

[@user-nq9gz4xf7f]

You seem to know what your talking about... My problem an old house that feels toxic , inflames nasal passages, it has asbestos insulation, i dont want to live in a toxic house so im thinking air exchanger is the answer? Short of selling my house?

[@MustPassTruck]

Have any free samples :)

[@NestorColter-n6z]

Elza Hills

[@TracyHager-m3o]

Cruickshank Islands

[@George_us]

Looking to purchase an ERV for a tiny house. Can you please recommend a unit? Thanks

[@soy_leche]

@1:53 So, is it a boy or a girl?

[@CharlesAllen-c2p]

Ramon View

[@N.G.B.N]

It looks great, but what would happen in the north where the cold outside can go under 32? In Msp we are even getting negative figures

[@augustreil]

He explains it around the 1 minute mark. You won't get all your heat back, but a lot of it. The bigger the difference, the harder it is to recover most of it.

[@N.G.B.N]

august thanks. I was trying to see if there was a different option. Keep in mind that I’m talking below 0 which is far from 32.

[@ednksu]

@@N.G.B.N 32deg is just arbitrary. It's just a device to recover any energy you've already put into your air with your HVAC when you have to move that air out of your house as exhaust.

[@mjb12141963]

it's a heat exchanger

[@tonythetiger9839]

I wanna pop the smoke too!

[@AlfredBraymiller-j4h]

Shanna Rapids

[@SainsburyRae]

012 Daugherty Stream

[@timg531]

How would this thing transfer humidity? Sounds unrealistic.

[@northeastcorals]

Yeh I'm no expert but I think saying it transfers humidity is a mistake, as far as I'm aware these cores only transfer temperature not air (which you wouldn't want) or humidity/water. Obviously a change in air temp changes its Relative Humidity due to how much moisture air can hold at a given temp but that is something entirely different 🤷‍♂

[@rickemanmierswe1031]

644 Kaylie Keys

[@paigefisher4529]

30007 Charlie Light

[@larrysholmes7588]

72325 Pinkie Groves

[@stephenelliot6875]

The baby is trans😧

[@josegallardo7467]

So,this can work as air purifier?

[@Phil-D83]

Looks like a nightmare to retrofit, but interesting

[@jacobbell8078]

there is only 1 manufacturer that puts out an erv for hung windows like mine. very expensive for what it is. Looks just like a window airconditioner. www.purifresh.com/erv.html these things shouldnt cost more than a cheap walmart window airconditioner honestly i dont understand how come its so expensive to buy it. anyone could install one.

[@BrownAbel-l8y]

Sheldon Turnpike

[@bell-architects]

It’s actually heat recovery or heat exchange...

[@myid9876543]

Bell Architects Ltd, Northern Ireland also works for keeping a building cooler and possibly less humid than just opening a window on hot days, though

[@ahassan3557]

Thought this was gonna vid on how to properly operate a gender reveal party

[@Engineer9736]

:D

[@ImTheJoker4u]

That’s some pretty shoddy work there. The leaks where blatantly obvious.

[@SN-hn9zi]

John Ulicky it’s a demo, relax

[@asdrubalsoto-o1f]

84911 Welch Causeway

[@bridjetmiers9811]

5268 Francesco Common

[@thebigdoghimself]

if you pull air from a kitchen where the air has contaminants aren't you going to ruin the core? I would imagine that core would get greasy and clog up pretty quickly?

[@bell-architects]

There are filters that need changed annually...

[@tylermack6387]

You wouldn’t connect kitchen exhaust to an ERV. Only laundry rooms and bathrooms. Remember, the moist air isn’t used when being sent to the return of the HVAC unit, but directly vented to the outdoors. The heat from the moist air is the only part transferred. The plastic core would be non microbial and drain any moisture to the bottom drain pan.

[@surronzak8154]

@@tylermack6387 Doesn't the ERV exchange humidity too ? as said in the video ?

[@tylermack6387]

@@surronzak8154 I would look at a picture of an ERV core. You’ll see how the passing air does not combine with the crossing streams. The only transfer that happens in the core is heat. The humidity from the wetter/warmer stream will condense when the heat transfers to the colder dryer outside air. Then drain out of the ERV. Humidity would transfer when using an enthalpy wheel in a commercial application.

[@surronzak8154]

@@tylermack6387 In the video he says the core is porus allowing humidity to transfert, and not all ERV have a rotary core.