3 HVAC Ductwork ISSUES Homeowners NEED To Know!

[@paulaguilar5041]

I have installed ductwork for 32 years here in Northern California. This guy did a nice job of explaining things correctly. To answer some problems- if you are getting too much air in 1 room and not enough in another room you could add balancing dampers in the ductwork to divert the air into other rooms. Also a big thing he talked about is too small return air to the unit, this causes many problems. 1 is the unit may freeze in a/c mode in summer because the unit is starved of air over the coils. He brought up static pressure. This is an issue with how the system deliveres air evenly. Proper sizing of ductwork helps delivery of air through out the home. Stepping down in size the further you go down the line is key to proper airflow. Hope this helps some of you. This guy is spot on here. Good job

[@NewHVACGuide]

Thanks pal

[@VictorCruz-wn8tz]

Paul , I have this issue on my new home , CFMs were tested in each room and it’s higher on one area and lower in another but still above the CFM plan However, one room is hotter in summer and colder in winter I asked for the engineering plans to be relooked at and ensure loads and cfm requirements are calculated correctly… we’ll see what they say

[@VictorCruz-wn8tz]

Also, the HVAC Tech said there are no dampeners at all , he said I’ll have to work with the registers

[@mikekolczynski5665]

@Victor Cruz installing damper collars is easily done by a pro. Using the registers only makes it noisier in the room. The extra heatload in some room's could be from what's in the room generating heat. Can lights, tv, computers... Lack of window coverings on the sunny side of the house... All easily fixable.

[@nsudatta-roy8154]

@@VictorCruz-wn8tz Good luck with that. Unfortunately systems are rarely installed prior to closing up walls. It would be nice to be able to run those flow numbers prior provided that ALL condicalculations. (Insulation, window effcy, sun, etc) are set forth in the load calc.

[@LIBERTY0RDEATH]

Well you just disappointed about 75% of home owners. Unfortunately builders and many home owners use cheap mechanical contractors for residential the majority of time. Therefore you get low skill labor at a a good price. Get multiple estimates from reputable companies and ask to see their work. If they can’t show you photos they don’t take pride in what they do. Doesn’t matter if you spent 20k on your new system if it isn’t installed correctly. Do your research on companies. Ask to see their work. If it doesn’t look good, it’s probably not. People that do good work take pride in their craft. It should look clean, not like a rats nest, or bomb went off. It should be sealed. Trash shouldn’t be left in the attic or basement etc. quality mechanical contractors are definitely out there but it’s up to the home owner to do their research on the companies they hire.

[@khalmaj4547]

Thanks for arming us with information. We are also grateful for all of the helpful comments of your viewers.

[@stevenskonieczny2616]

Thank you. You earned my support. I’m pretty sure you solved my house heating issue. I probably have a 30 foot trunk with a 90 degree angle all the same diameter. The two rooms in the end are freezing.

[@bobnelson1428]

👍 as a former Licensed Sheetmetal worker , estimator, business owner, and heating design, this man explains it well without going into excessive detail.

[@potentialhvac6074]

Plenums with duct work off the sides work good as long as you keep your take offs towards the cap and use volume dampers at wys for each supply to vent. And alway as Mr Griffin said step down size at transitions Great video 👍🏽

[@geoelectro]

A few of years ago I got a new AC. It was supposed to be a 4 ton unit for 2200 sf. Another company came out for a free yearly checkup and I was informed I had a 5 ton unit and my ducts were not adequate. He also suggested a second return air. I had 4 estimates from 4 companies who all pretty much said the same thing. I had the first company do the job. 9k for all new ducts and additional return air. What a difference. It’s very quiet now and the whole house stays cool. Before, the living room for example would not cool down during the day with company over. That ductwork costs more then the AC install. But, I should only have to do it once!

[@Hurpdurpdipidydoo]

Having enough return is an extremely important part of a properly running air conditioner. Also not using restrictive 1 inch pleated filters they cut airflow substantially.

[@The1JBanks]

You can put dampers on the “spider” systems and balance out the air flow in each room.

[@jeffreybricks2687]

Bro you have explained exactly what I was looking for YOU'RE VIDEO WAS AMAZING, THANK YOU, best explanation 👏 🙌 👌 everrrr!!!

[@NewHVACGuide]

Wow. Thanks pal

[@jeffreybricks2687]

@@NewHVACGuide you're welcome have no idea how much that helps now I can put the peices together

[@MrL99]

I made 2 million dollars this year!!!😁 but this video is amazing 💪🏾💯💯

[@struckync]

I rented a 5000sq ft building for my restaurant, was having trouble with the air flow. I was shocked when i went in the attic and see what the previous rented had done. 2 4 ton units main duct work was about 8 foot long, each unit had 12 vents. but they used 12 flex to all the vents and tapered down to 6'' about 3 foot before the vent. this caused NO AIR FLOW. not to mention the power bill was 1200 a month. i fixed all the ducts. and air flow is good and power bill is down to 550.

[@GlennJ11]

usually you can adjust the air flow by closing or opening vents in the room. i have 31 apartments and homes. that always done it for me.

[@Hurpdurpdipidydoo]

Stop using the expensive one inch pleated filters, they are restrictive on air flow and they cause lots of problems with refrigerant pressure which then makes you air-conditioning run badly

[@NewHVACGuide]

I’ve seen some of them cause issues when they are brand new. But after they get dirty, they are extremely restricting airflow.

[@DoubleJHas2ManyDoodles]

Always check behind your plenum box and make sure they sealed the area off from the attic if you have a closet mounted blower! Paid $8k and found the installer never sealed the back 4” off so I was pulling dust , dirt, and gross outside air into the closet into the intake and through and out the duct work! I fixed it myself because I’m so sick of being scammed by AC guys.

[@OneLeggedTarantula]

same here. my guy showed up smelling like weed and the plenum wasn't even square to the point of having a 1/2 inch gap on one side which he "mastic'd up". I had my drywall contractor come behind him and seal between the plenum and the attic. He also created a flow unbalance and one of my bedrooms gets hardly any flow.

[@eman-3]

Great explanations man. I'm definitely subscribing.

[@sheltdog8463]

Perfect explanation of HVAC. I’m a plumber of 30 plus years so I’ve seen some duct work. If new homeowners and about 95% of home inspectors would watch this video a lot of new homes would be left sitting! Several years ago my Dad hired in the side a couple of my sisters X buddy’s to install a new furnace and a/c unit which he purchased and of coarse he upped the tonnage which he thought would be better. Well after the install the unit which was a Lennox began having problems. Well of course he had a HVAC contractor come out and they said they couldn’t find any problems. I went and just put my eyes on it and began doing some test just using a thermometer and common sense. After doing some thinking and calling my buddy which is a HVAC company owner and explaining the situation and giving my thought on the problem he told me your exactly right. The unit was starving for return air with the unit being upsized. So I called my dad and told him I’d be over the following weekend and we can address the problem. Thank god I got there when I did because he had already drew out lines on the walls where he wanted the return vents and had started cutting Sheetrock with a razor knife. I stopped him in his tracks from cutting any further and told him we’re not going up into any walls we’re gonna go through the floor! Short story long we finally got the returns in and the unit has worked fine ever since! The contractor world needs more Professional People like you in it!!!

[@JessHorsemanship]

I thought returns are always through walls near the ceiling and not the floor ?

[@johnnyzsalt5374]

I have a 5 legged spider to deal with. Definitely looks like a DIY project by previous owner. Big, fat 9 inch ducts with asbestos tape. No HVAC company will touch it so I gotta do it myself. I'm hoping to find some sort of cap for the extra holes and commit to a main trunk line off of the remaining take off. Then will use flex duct to reclaim some ceiling space.

[@gund89123]

Most contractors I talked to won’t give me any technical details in size of the unit needed, what size ducts are needed for my home.

[@davidhoover2446]

The biggest issue for indoor air quality and occupant health is actually duct leakage. Even brand new duct systems leak quite a bit. Our brand new, pretty well done duct system actually had 120 cfm of total leakage. We had aeroseal seal it all up for us. Everyone is breathing contaminated air, pressurizing, or depressurizing their home with poorly sealed duct work. No good. Contractors building building's envelopes and mechanical systems are directly affecting the health of the occupants. In my new house, I needed to add ventilation because VOC's were too high making me not sleep well and our house prior to sealing the ducts was pulling in attic air and pressurizing the house. There's a lot of data now showing indoor air causes lots of chronic health problems. It's time for A/C guys to start paying attention instead of just throwing in a single speed A/C with a fiberglass filter, no ventilation, no dedicated dehumidification for mild months, and etc. Into homes and not thinking anything of it.

[@xslabcabxhearsex]

When we come to your home and tell the homeowner what needs to be done on a new home install or changing out the equipment in a older home,it all comes down to what they can afford. As far as duct work it’s code to seal all the joints but sadly not the designing of the system.its a lot of hacks out there.we can sell you high seer inverter systems with high in air purifiers,ultra violent lights,humidifiers,ERV systems but the majority of people can’t afford this level of job.

[@The1JBanks]

Then the homeowner needs to pay for it. Builder only pays for bare minimum. You want it? You pay for it.

[@markchandler5095]

In California the system has a duct test. The test goes right to Sacramento, this is done by an independent company. So, little to no leakage.

[@masontroglen3413]

Yeah like on mobile homes. The plumbers, electricianz, and AC guys drill holes in the sub floor and dont seal. So literally a bunch of seals not sealed let alone ducts are never installed correctly.. you need the right tapes, spray glues for the tape.etc. just did our home and we had a basketball sized hole in the trunkline where a duct used to be.. they had it capped but it was just tape and over time just fell to the floor... Lol

[@ARTICFR0ST]

My ac broke last summer. Now I need to replace both AC and my ancient furnance. Only to find out the duct work is too small for the house I have and no matter how good my systems are, it will struggle to cool the 2nd floor.

[@tombeilman5579]

I think they run way to much flex duct here in Arizona, in KC where I’m from it’s all metal duct, should be like commercial with no more than 6 ft of flex duct

[@Sesamestreet9080]

Yeah here in Topeka city inspectors came to a new apartment building and they ran all flex duct and made them take it all out lol

[@Kyle-84]

I have a 1200sqft 3/2 and a 2.5 ton unit that is 3 years old. The air handler is in the attic, and I'm replacing the entire duct system from the 70's by myself. Your video has been the most helpful I have found yet. You even used the same size house/HVAC unit I have as your example. Praise The Lord, Jesus Christ.

[@noahswarz4914]

that's one of my biggest issues with duct work in south florida and small installers. You tell them, listen this one room right here is always hotter so please, push more air to that room. NOPE, they always end up with smaller duct or horribly laid out because of standards that all of them have; this room is this size so it gets this register size and duct 🤦🏻‍♂🤦🏻‍♂

[@nvidiashield495]

10 years ago I had round hard ductwork installed and it’s cooled the house better than ever. Recently I called a company to check for a leak in my unit and they ended up sending out a couple guys to give me a estimate on a new system. We had heavy rain the previous day and they told me they couldn’t price a new unit without new ductwork as it got wet and had water inside. The ductwork was installed with hangers and may appear it’s laying on the moisture barrier but it may just be the insulation that got wet. I don’t see how they can tell if water is inside. It’s a large heavy duct . They left without giving me a quote because I declined new ductwork. What do you think?

[@theunkownmr.562]

The cooler the return air is the better your Delta T will be, correct? If your getting 80 on the return and 60 after the evap thats fine, but as the house continues to cool you should be able to maintain the 20 degree delta, correct? Lets say your return air is 75 and the temp after the evap is 55? Is my logic correct? Lets say your home temp starts off at 85 so your return temp before the evap is 87. As the home cools, your return temps go down, technically the temps post evap should.continue to go down?

[@mikec4834]

Own a ranch, have 6 ducts on the main floor 2 have high flow 2 have adequate supply and the last two are useless. Have 4 in tbe basement that are so-so. To me it takes too long to cool the house given its a 42x25 ranch. This cooling season will be the compressors third. Not only does the usless one's on the main floor not cool the two rooms they feed it's the same outcome during heating season. Have a Goodman gas furnance it is six years old. Also the duct work is original to the home (built in 1952 ). Any advice ?

[@johnwhite2576]

goodman-my condolences...

[@mrnice9922]

Good video. I have 6 inch lines for rooms. My question is return air will be 6 inch as well. Can I install 4 " vent for washrooms? Approximately 50 sft.

[@RandomVids519]

Quack everytime he says duck😅

[@michaelbaldwin3356]

System size, location and cfm determines if a trunk line should be reduced. A 2 ton in the center of a house with a even 400 cfm going each way with 10x8 metal duct wouldn’t reduce. I have done 2 1/2 ton in the center with 10x10 each way and not reduce.

[@jannatulIslamdiya-dk4fg]

I'm ducting air-conditioning worker in Singapore 7 year experience

[@elizabethcollins1548]

Please Help..my problem is I have 2 seperate Central Air Systems for my 2 family home..been getting estimates for 2 new Systems..my problem is they say can use existing duckwork also the condensors one in attic ..one in basement..I have had 4 HVAC reputable contractors give me free estimate..today just got first quote..32,500..thats alot the pdf I received only had possible one rebate from ma save for 7,500..the contractor said ..I may not qualify for more rebates..due to my home is heated by pellet stoves ..mostly not oil heat..as I have oil burner..but cant show receipts for oil purchased..as I mainly heat with pellot stoves..still waiting on 4 more quotes..Crazy..as a home owner for 47 years..running into astronomical quote..so far..still have 4 more quotes to come..I have done my Research with the BBB= Better Business Bureau..to make sure no complaints on them or that . IM NOT GETTING SCAMMED..I just hope they are being Truthful on my home not needing new du twork or new vents..Wish Me Luck..

[@jackhanson8467]

Nice and informative video, thanks.

[@NewHVACGuide]

Glad it was helpful!

[@ChrisDembinsky]

Can you make a video that compares a few common flex duct brands. Maybe include what can be found at big box stores vs HAVC supply houses.

[@Engnrguy777]

Thank you for this video! Wow, my home has all of those issues…trunk not stepped down, rooms warmer than others, same size (6”) duct going to every room regardless of size, supply coming off the end of a trunk. I’ll be calling for someone to review it this month!!

[@segaldj1]

We are replacing the 31 year old spider ductwork in our attic this week and our the HVAC contractor is planning on using mastic tape vs non-hardening mastic sealant on all the joints. Should I insist on the messier non-hardening sealant? Is it a good idea to use the non-hardening sealant layered over top of the mastic tape?

[@peterruizquiles5919]

I have the HVAC system in the attic in a new 2 story house. I have a duct that is not routed to any room, it’s just blowing cold air into the attic. Is that normal or the contractors just left it incomplete?

[@summerforever6736]

Incomplete! Wasting energy

[@DanielleWalkerOnline]

Can a return be placed right next to a duct. My hottest rooms they are next to each other and it just doesn’t make sense. It’s ice cold everywhere else and super hot in my guest rooms

[@VictorCruz-wn8tz]

I have a similar situation Lmk what you find!

[@Sesamestreet9080]

If a return is too close to a supply duct you basically won’t heat or cool the space effectively. The supply need to be further so the air can circulate better

[@Sesamestreet9080]

@@VictorCruz-wn8tz If a return is too close to a supply duct you basically won’t heat or cool the space effectively. The supply need to be further so the air can circulate better

[@fobypawz418]

This is such a critical video. I think I'm going tour some new open houses in my area and see if the ductwork is up to par like the points you made in this video, and then find out who the HVAC installer is for those properties!

[@NewHVACGuide]

Let me know how that goes pal. Good or bad

[@fobypawz418]

@@NewHVACGuide Will do! Just the fact the you're protecting people's investments is awesome because nothing more I hate is spending hard earned money only to be disappointed afterwards.

[@mlt6322]

@@NewHVACGuide You should do a video on return duct strategy & placement. I went round & round with the scabs that installed my mothers system back in 76 about return ducts. They should have louvered vents with 1 high and 1 low on each floor so that in winter they suck cold air into the furnace and in summer they suck hot air into the A/C system so the system can adjust the house air pocket to make the T-Stat work less often to maintain a constant temp and make the system cheaper to use. They put the only return duct in the downstairs floor and in summer the upstairs temp was 45* hotter than downstairs. 25 yrs later I got the house and cut the wall open and added a return upstairs and evened out the temps myself.

[@NewHVACGuide]

You bring up a good point. Makes me wonder if sometimes things are not done properly because they are trying to keep the cost down as much as possible or if some folks are just simply lazy?

[@johnwhite2576]

@@NewHVACGuide the answer is both unfortunately The answer is both

[@maximusmarine]

Thumbs Up!!!

[@sheepdog3828]

Our 3 y.o. house has been half hot half cold on day one. In 50 years, 5 houses never had this issue. The lennox dealer twlls me no problem. Told our builder if it does not get corrected I'll be calling the customer experience number. Right now i have a window unit in back bed room. And it's a spray foam insulared house!.Arrgh...

[@markfairbanks3533]

2:10 Those step downs aren't for the rooms at the end of the trunk line, they are for the branches BEFORE the step down. If the trunk doesn't reduce in size all the air will pass freely to the last vent.

[@isaacrowe8977]

No. Path of least resistance

[@Joe-qw6il]

I’m in the process if redesigning my attic hvac system, i Have a 14” supply line off a 3.5 ton unit, two bedrooms on north end if home sit right underneath furnace in attic so they’re super short duct runs and as a result cool down and heat up super fast in comparison to other two rooms, other two rooms sit on opposite side if home, supplied from a 16x16x36 supply dist box, fed from a 30 foot 14” supply flexible duct, so you can imagine way less pressure on those two rooms, my plan is to shorten the main 14” supply duct so that distribution box sits right in the middle of the house, then feed all 4 rooms with equally distant same diameter duct line, I’m thinking that should equalize air output into all rooms, what do you guys think? Thanks

[@phillipm3799]

I’ve got an addition I’m running duct to and I’ve gotta run 4 more vents. About 30ft away for all of them. Might scrap that idea and do a mini split for it

[@teresabeyer2195]

I'm in a newlybuilt 1500 sq. ft. townhome 2 floors 3 bedrooms, and the back 2 bedrooms never seem to get cool. I have a Carrier 14 Seer 2 Ton condenser. The air in the front bedroom and downstairs is cold enough but in the back 2 bedrooms its very warm i.e. Front room 73 Back 2 bedrooms 78. Thermostat is set for 72 but on a really hot day it runs all day trying to get to 72 but never does. Any ideas?

[@MPDLR]

Great learning here, thanks. OK FOLKS - PLEASE HELP. 2 years ago had 100% new Furnace/HVAC installed. And, other than my leaky crappy windows - yeah, the house warms and cools. *But* all of a sudden - my basement is really really cold. As in, I need a winter hat and 2 sweaters to watch TV down there. Fully finished basement. I actually feel a cold breeze sometimes - but for the life of me can't see where it comes from. It happens when NO heat or A/C is operating- my suspicion is the breeze happens right before heat kicks on. I've literally slept next to vents in basement. At best a tiny trickle of air - sometimes but there's no way that freezes a 1000 square foot basement. Exhaust fan in bathroom I out my hand on all the time - no cold air there. I've hung toilet paper everywhere - once in awhile I see the paper wiggle. And I'm totally still and no heat/AC is kicked on. But again dont know where the heck the air comes from. Any ideas??? Could it be leaky ducts - shooting cold air thru the ceiling tiles into basement? Appreciate any thoughts, thanks.

[@browniegay9130]

I hope someone can answer my question. It feels like fiber is coming from the ducts and burning my skin and covers my bed. What do I need to do? HVAC workers keep saying says the system looks good but my skin says differently. Do you think is a leak somewhere? Can’t find help. I had check ups and was told it’s something in my house. Yes, a camera was used.

[@NewHVACGuide]

Has anyone ran a camera?

[@browniegay9130]

Yes

[@st6795]

my air handler is holding and leaking water.

[@patrickbullock2136]

As a retired engineer (BSEE) I have to say that the duct work IS the weakest link, and although the airflow dynamics can become quit complex Mr. Griffin provided an excellent, easily to understand explanation. Einstein quote: “If you can't explain it simply, you don't understand it well enough.” This is who I would want to do all my duct work service.

[@palopallas9237]

thank you, sharing your knowledge... U explained simply (& Logically) ..Am "simple home owner" (not in industry) w/ desire to know: "should expect of duct work": design & function

[@andyhunt7364]

Is there way to determine if your existing HVAC system is big enough to add room vents to? I have a basement that was finished but no vents. Wanted to tap 2-3 vents into the existing ductwork but concerned may affect system ability to heat the house. Worried if I have an HVAC company look they’ll see it as an opportunity to force sell me a bigger unit I don’t need.

[@Illiardys]

I'm so scared to call HVAC to help with my ducting I'm dreading the cost. It's so bad.

[@MatthewsFabrication]

My Ductwork in my 2nd floor blows massive velocity cold air in the open area & hardly any velocity in the three bedrooms. There are air vents are over my downstairs & it freezes us downstairs. Whereas the bedrooms are 6 to 10 degrees hotter. Can the bigger ducts go to the bedrooms instead?

[@patrickkelleher2309]

What if final supply is 70 ft away? You still want step downs? Let’s see the calcs

[@KetoJames]

How do I stop cold air coming from the attic return when the heat is off?

[@NewHVACGuide]

Have you tried turning on the air circulate on the thermostat? Also seal around the Plenum/registers.

[@KetoJames]

@@NewHVACGuide Just tried that and when its on there is no cold air.

[@scifiuniverses3736]

I just had an estimate for Amana i have two systems. 1. 3 Ton 16 Seer Gas System1 $8,542.00 2. 3 Ton 18 Seer 2 Stage Gas System $12,125.00. Total, $21,958.69

[@NewHVACGuide]

Big decision!

[@scifiuniverses3736]

@@NewHVACGuide I have a question, I was told the grabagee can style condenser last longer than the min-split style of condenser is that true?

[@kathey1981]

Thank you so much! I was getting ready to open up that end where you just told me not to to add another piece of duct myself. Lol unfortunately what we used to have was the metal ductwork and after we had a flood in my area when the guy redid the furnace we ended up with that cheaper looking flexible stuff. I don't know if it's as good as the metal or they're about the same.

[@candyloo8164]

I have a 25 year old home. My master bedroom doesn’t get enough heat. It’s super cold. I cleaned the vents already. Idk what I can do about it. Pls suggest

[@KBradAdams]

Should the large pipe leaving the AC Handler that is covered in the BLACK INSULATION be sweating? It that normal?

[@thedpkid]

I have a Mobil home ac vents are in the floor. ? Is should the return air be up high over the coil or should it be in front of the coil I ask this because when I got the trailer it has two returns 16/20/1 direct above the coil. It’s a 4 ton

[@bass-brigade]

Is the solution for a spider duct system to run less lines with more branches? Mine has 4 flex ducts in one box 2x2. Two go to either end of our bonus room and two run to the upstairs bath and bedroom. The furthest runs are 20 and 25 feet. I can barely feel any airflow even by adjusting the other vents to semi closed. Thought about installing fans to push the air but am looking for a better way. No leaks or pinches in the lines.

[@OMomA-c7p]

Halo I had a new ductwork puut on just few months back and since then I been feeling sick an been to emergency walking clinic because I breath my home is very dusty an low humidity an feels freezing cold please I begging someone to help me I'm dying here in my own house I need help doctor recommended for me to move from my own house but can't leave my cats an I need to fix the problem anybody can help me suggest something

[@cuevasskinner]

Can move from walls to ceiling? Trying to move duct in kitchen

[@joshuaellison01]

We are searching for a solution to our in slab duct repair issue. There appears to be areas which are deteriorating and the spray encapsulation, like Duct Armor, seems like a good solution. Anyone have experience or feedback on this method? Replacing what's in the slab does not appear to be an option, neither is installing split units or overhead duct work.

[@LOFHOBL]

Imma go in my basement and check this out. Mad issues unattended for a couple winter seasons now. Landlords grrrr.

[@ambientnature862]

Thanks for the video. I have a question I hope you can answer. We did a remodel on our kitchen. There was a Half wall that created a small entry space from the front door that we had removed to enlarge our kitchen. This wall had a hot air duct that pointed into the small entry way. After the renovation and removal of the wall, that same vent now is open and points down into our basement area. Can I remove that since there is already a vent into that room or should I leave it alone? thanks

[@MrPhatties]

Any idea why my HVAC starts smelling bad when the fan is runnint 24/7 vs intermittently? Smells musty almost.

[@patricathomas6155]

my intake in the kitchen used to suck out down to the basement and someone tampered and now my intake is blowing air into the kitchen instead of the cellar. Is the harmful Please help.

[@christinebalch9112]

Oh wow, my son's father's last name is Griffin............. ! Must be a total coincidence

[@johnterpack3940]

I know our system is screwed up because everything else in the house is screwed up... so I doubt the HVAC is the one thing they magically got right. 50 years of accumulated DIY don'ts and contractor shortcuts.

[@bluesdirt6555]

Just bought a house that has noisy ductwork when it heats up it sounds like hammer’s banging on the stuff! Expanding and contracting?

[@NewHVACGuide]

Could be the ducts bending. A pro can do a cross brake fold. Among other things 🙂

[@bluesdirt6555]

@@NewHVACGuide seems like it’s mainly on a couple runs but the one that bothers me is under the floor of the master bedroom really loud! But they can quiet them down?

[@summerforever6736]

Spirits?

[@johnratliff4594]

Those boxes on octopus systems are not just boxes, unless the installer is a complete idiot. They will have deflectors and balancing dampers. The other info was great.

[@idgafboutnethang]

He quickly noticed he was doing a gluc gluc in the straw example. Good recovery though

[@zlowe111]

I have been having issues with ac or heat blowing out of my return vent. Every time I call home warranty and have a hvac guy come out, the problem fixes itself. It’s extremely frustrating. I thought it was our unit and paid 14k for a replacement less than a year ago. Now that’s that, it’s obviously the ductwork or wiring. Anything to help would be GREATLY appreciated.

[@Hurpdurpdipidydoo]

It’s probably not hooked up an air conditioners are a negative pressure system so it’s pulling air from there from your attic

[@coleengregory9886]

My back rooms do not get warm enough. My hvac is up in the attic. What kind of company does duct work inspection and repair?

[@adiliraliyev5882]

Would you have air ventilating trough your ducts with the fan on your residential unit off.

[@Just4myownsongs]

I have a 3500 sq ft house, two floors. The furnace heat comes out only from the left side of the house. I checked the duct work, both sides of the house come out from the same duct, I am confused.

[@bobschallalcs584]

most people do not realize that you can heat a house with 4 inch duct but to cool the same house it will take a lot larger duct I remember a man a do it yourself-er and duct his whole house with 4 inch duct this was during the winter well he calls me up and now it is the spring going on summer he tells his air condition isn't working right it was work alright several weeks ago I went out and looked at his system and he installed all 4inch ducts though out the house well I told him that the ducting is to small e said well it heat the house just fine and it cooled the house until a couple of weeks ago he did not believe me so he asked me what to do I told him he need a load calculation to size all the ducting well I did a load calculation and there were two 2 rooms/places that took a 4 inch duct it was a walk in closet and a bathroom when I told him the price and he had rooms where the Sheetrock would have to be removed and the air handler would have to be relocated job was going to be $ 6K he though I was lying and cheating him - he is reason why I charge in advance for load calculation now

[@OneLeggedTarantula]

yup, I got burnt by a guy that did the octopus run.. one bedroom gets no heat or cooling.

[@NvTwist]

So far I’ve gotten 3 estimates to have A/C installed to replace the furnace only I currently have. Not once have the company looked at any of the registers, duck work or the return. 3 company’s that I’m not hiring. Should I have any confidence in the 4th will be any different?

[@johnwhite2576]

Probably no different

[@NvTwist]

@@johnwhite2576 yup no different… 4th said we don’t install or work on ducting, just what’s needed to adapt new unit to existing ducting. Minimum effort at a premium price… slowly putting themselves out work pushing more and more to the self install setups that are rapidly growing

[@mattc6532]

I bought a house in 2022 with heating/air that hadn't been upgraded since 1996. The ducts had mold in them. So we got a small company to replace all ductwork and system. The unit was in the crawlspace and had sheetmetal (with fiberglass insulation on inside) ductwork trunk line throughout the crawlspace with flexducts running off the metal trunk ductwork. I was kinda surprised when I saw after job was done that they didn't use any sheetmetal ductwork at all to replace the trunk line... only used flex duct for the entire duct system. Is that normal these days? Anything wrong with having all flex ducts?

[@bwrick21]

Had a new hvac installed with duct work. One of the flex duct is resting on the water heaters vent pipe. Is this okay or should i put on a heat shield?

[@robsmith4884]

Call the contractor NOW and send a picture to them. While you wait on them to repair…. Use plastic plumbing strapping to lift and isolate the hvac duct from the heater’s vent.

[@dakiddnyce]

I have one room that’s hotter than others and my master bedroom barely get heat or air, no heat or air doesn’t even come out of the one vents. I had the hvac system replaced in 2013 with a TM9V 96% AFUE Two Stage Variable Speed Furnace with 2 stage air conditioner and the company that did the install when I told them about the issue they said the system is working properly when they performed a maintenance check on it. I’m at a loss, a heater in our master in winter and a separate ac unit in window in summer. House was built in 94 we’re the second owners with a crawl space no basement. Any suggestions would be helpful!!

[@candyloo8164]

I have the same problem. What did you end up doing?

[@geworthomd]

I have a very centrally located electric furnace. Can I come out of the plenum on all sides like a Medusa? I don’t have a particular direction I need a trunk.

[@gaylefriedman3773]

Mr. Griffin, as a Subscriber, I got much well information from you. I want to ask you, could ductwork go bad due to a Roof Leak not known until your kitchen wall went pink? I live in a Condominium. Should I be covered for my Roof? I make monthly payments for this, and more. However, the Management didn't do much. I had to find my own Restoration Crew. Can I stop payment on Maintenance due to negligence on the part of Management? Thank You! As always, Wonderful Tutorials.

[@ostn8iv]

😣PLEASE HELP!!! Is it possible to switch or change ducts from insulated tube style to the rectangle style? We have a new build, but the manufacturer put in insulated tube style, and I wanted the aluminum rectangle style. It is a double wide 28' x 80', and the tubing wasn't built correctly in some areas where they wouldn't line up plume and be off by 2 inches give or take. Now I smell mice, and it stinks yo the point where we don't want to utilize our heat and/or central air!

[@NewHVACGuide]

Yes it’s possible

[@steveurbach3093]

Hoo Boy. The house I am in has a closet (raised above floor level) 85% system with the return air below. When the house was enlarged, they doubled the # of return grills (height is not changeable). No filters. The unit has a green mesh filter but you can't use a pleated in the housing (way too much restriction). And No step down anywhere. Balance? ya gotta be kidding!

[@maxmanx1294]

It seems that HVAC location & work is an afterthought in New builds. The HVAC trades comei in after everyone else & try to fit ducts & equipment wherever they can squeeze it in. That's definitely the wrong approach for such a critical & costly system.

[@NewHVACGuide]

Great point pal

[@amysmith3247]

I have a finished basement and we put in a new air and heat pulling cut out and made. Can't see why heat isn't coming out like before.

[@jennarosityaccessories]

Best explanation I have ever heard. Thank you so much!

[@JamesZ1025]

Will 8” flex fit over 8” metal ductwork? I have a small piece (36” long) of metal ductwork in a closet that is sweating like crazy

[@NewHVACGuide]

I don’t think so. But you can insulate the hard duct nonetheless

[@mikekolczynski5665]

Get some bubble wrap (the tin foil looking stuff ) and a roll of tape.

[@sichen2631]

If one of room has too much air flow and noise, should I add a damper which close half of airflow?

[@frankmontez6853]

One room's warm because not much air is coming thru the vent . I played with dampener both ways but made no difference . That means duct is open / damaged or unconnected to the trunk ? That's pretty much the only thing it couild be ?

[@NewHVACGuide]

Sounds like it could be 🙂

[@davidwilshusen4332]

Wonder if R value in duct work fits into the equation? R-3 flex doesn't cut it with my home in Texas.

[@LBstrikesagain]

Just had my house detailed by a sheetmetal worker and discovered that the work done by a previous "mechanical" contractor was essentially trash. My kids rooms never got ac in the summer and heat in the winter. The contractor ran a supply line to the branch of a wye to feed 2 rooms. Pathetic

[@NewHVACGuide]

I’m glad they found it!

[@eileendarlene3543]

If my filter doesn’t get dirty what problem is this suggesting? My house is dusty. I’ve changed my filter. I’ve tried the simple and expensive and I’ve used the pleated. But none get dirty even if I leave it in for months at a time

[@NewHVACGuide]

Is the return in the ceiling or down near the floor?

[@Linnie1958]

Filters are on air handlers to protect the equipment that is exposed to the air flow going through the air handler. They are not there to remove the majority of the dust in your home.

[@danrichardson4275]

Those of you who are HVAC techs who design the ducts and size the HVAC unit will argue about this HVAC system design improvement. Because below I am outlining an electrical improvement that will save hundreds of millions each year across the USA. As follows: Add to the thermostat control panel the ability to control the level by selecting 1/2, or 1/4 heating or cooling energy. What this does is reduce the flame for the heater, and reduce the compressor for the AC, and also reduces the fan for both. Now it is perfectly safe to close those unused vents and save a few hundred a month or possibly thousands of dollars a month depending on the square footage of the space being heated/cooled.

[@biomedlib]

My house is built on a slab. There's a crawl space/attic. However, the ductwork is in the ceiling and walls. How do I find out what ductwork I have? I don't know if it's suitable for a 2 or 3-ton system.

[@Zikolondon]

Best video ever thank you very much for all valuable information and tips

[@NewHVACGuide]

Wow! Thank you for that comment.

[@ThatEEguy2818]

When installing an exhaust vent for a stove, it it required for the vent to be double walled to keep surrounding building materials from getting hot?

[@joshuaespinoza6331]

They have flow charts for your last point.