20 Causes of Low Indoor Airflow on Furnaces and Air Conditioners!

[@acservicetechchannel]

-My Paperback, E-Book, Workbook, Quick Reference Cards: www.acservicetech.com/store -E-Book: play.google.com/store and search "AC Service Tech" -My Paperback and Quick Cards: www.amazon.com/shop/acservicetech -Support the Channel: www.patreon.com/acservicetech -Tool List: www.amazon.com/shop/acservicetech -Facebook posts every other day! facebook.com/acservicetech -Our Articles and Quizzes: www.acservicetech.com Related Videos: TESP for Airflow kzbin.info/www/bejne/m3fQdaChZricp8U Airflow CFM Measured with a Hot Wire Anemometer! kzbin.info/www/bejne/Zqi6iqZ3o5uYfdE HVAC Temp Rise Formula used to Measure Airflow CFM! kzbin.info/www/bejne/l5ikl4lpjtaVbbc HVAC Delta T Explained! What Temperature Should it be? kzbin.info/www/bejne/b52nnWiZm6uGsNU Duct Sealant: Duct Mastic in the Caulk Tube: amzn.to/3fc1pzm Duct Mastic Tube: amzn.to/2SrIGpU Checking the Charge Tools: Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq Refrigerant hoses with valves amzn.to/2aBumVI Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9 Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq Digital Refrigerant Scale amzn.to/2b9oXYl Ratcheting Service Wrench amzn.to/2dGV4Nh FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4 FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6 Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8 QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3 Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ Electrical Diagnosis Tools: UEI DL389 Multimeter amzn.to/2xAdaJf UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ Magnet Jumpers- amzn.to/2PyKPQZ Alligator Jumpers- amzn.to/2PxqJXn Irwin Wire Stripper/Cutter/Crimper amzn.to/2dGTj2V Vacuum Tools: JB 6 CFM Vacuum Pump - amzn.to/2nqbvo8 CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY 1/4" Appion Valve Core Removal Tool - amzn.to/2uYr8WL 5/16" Appion Valve Core Removal Tool - amzn.to/2JHmfbP Appion Blue 3/8" to 1/4" Vacuum Hose - amzn.to/2uYlVyc Appion Red 3/8" to 1/4" Vacuum Hose - amzn.to/2uYg6Ro Yellow Jacket 1/4" by 1/4" 3’ hose - amzn.to/2umtcod Appion 1/4" by 1/4" and 3/8” hose - amzn.to/2Zyxzx9 Uniweld 1/4" by 1/4" 2’ hose - amzn.to/2GFov1Y CPS Vacuum Micron Gauge - amzn.to/2v1nM3O JB Vacuum Pump Oil - amzn.to/2mGrlXy Flaring Tools: Yellow Jacket Flaring Tool - amzn.to/2OBxGlM Spin Flaring Bits 1/4", 3/8", 1/2", 5/8", 3/4"- amzn.to/31BCs8Z Yellow Jacket Flaring Tool with Set Depth - amzn.to/2QIKsQH Yellow Jacket Torque Wrench - amzn.to/2NRR68Q Uniweld Swage and Flare Kit- amzn.to/2T55jyn Nylog - amzn.to/2MLJcch Ridgid Tubing Cutter - amzn.to/2DnjjR1 Wolverine Tube Reamer - amzn.to/2QGLyMV Swaging Tools: Manual Copper Tube Swage/Expander- amzn.to/2WRPa1M Spin Swaging Bits 1/4" to 7/8" for the Drill- amzn.to/2YQwwqS Uniweld Hydraulic Swaging Tool- amzn.to/2MlrI8m Uniweld Swage and Flare Kit- amzn.to/2T55jyn Uniweld Hammer Swage kit- amzn.to/2CzWMMU Uniweld 3/4" Hammer Swage- amzn.to/2CzXsSs Uniweld 7/8" Hammer Swage- amzn.to/2Mja5WE Uniweld Multi-Size Hammer Swage- amzn.to/2T3Cx1b Brazing Tools: Air Acetylene Torch setup - amzn.to/2aQalsb 15% Silver Brazing Rods - amzn.to/2gVLyLc Ameriflame Oxy Acetylene Torch Setup #1 &#2 Tip - amzn.to/2SRm3JF 40cu B Tank to 10cu MC Tank Acetylene Tank Fitting - amzn.to/2GxZZPi Nitrogen Regulator - amzn.to/2bXdR5f Uniweld NitroVue Flow Regulator - amzn.to/2GnsaAo Uniweld Nitrogen Flow Meter - amzn.to/2brvoBg Stay Brite #8 Silver Bearing Solder and Flux - amzn.to/2XIDJsY Aluminum Braze Rods - amzn.to/2IGNMu Refrigerant Leak Detection Tool: Accutrak VPE Ultrasonic Leak Detector amzn.to/2nFYKVe Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.

[@Bryan-mg4gf]

AC Service Tech LLC will a undersized curb adapter for a RTU cause low airflow if the return and supply portion are too small?

[@eddenoy321]

Do you have any recommendations for honest HVAC companies in Las Vegas or how to find one ?

[@nibtreak5308]

Problem #21 : If you have a thick filter (i.e. 5"), the cardboard separators between the filter fins can get displaced making the filter fins collapsed over each other. This can happen with a brand new filter or whenever you pull it in and out. It took me a few days to figure this out after checking most of the potential problems listed in this video. I hope writing this here will help someone and make your day! Great videos by the way, thanks for sharing!!!

[@1999JAMES.]

yeah,look closely at those filters don't let the fans suck them in Sometimes they are not glued very well. Elmers glue might work.

[@ADontIDo]

Invaluable video OP. You're doing a service for the general public, moreso than just about everyone outside of HVAC school. Thanks again for the video. As a homeowner DIY you're saving countless people the headache of dealing with techs who come out and "top off" the 410. Who don't bother troubleshooting because they just want the quick buck.

[@davidestrada5488]

One of your best videos yet.I really needed this,you don't know how many jobs I see that have low air loss problems and I see techs just think it's a low refrigerant problem...

[@acservicetechchannel]

David, that is really great to hear, thanks!

[@matthewforestieri6895]

Thank You! You are a great teacher who is motivated with great pride for excellence. Keep it up

[@acservicetechchannel]

Thank you very much Matthew!

[@UNITED2009100]

As a home inspector, I see this stuff all the time, especially shootie workmanship

[@jeffreyrogers8151]

I think you mean "shoddy" lol

[@Cplm92017]

​@@jeffreyrogers8151but I like the word "shootie" better. It's cute 😁

[@Dingleberry1856]

I bet your reports are fun to read.

[@UNITED2009100]

@@Dingleberry1856 Fun to read and fun to fill out. I enjoyed doing inspections. Did over 1000 in the short time I was doing it, but fortunately for the realtors, I have stopped doing inspections. I had many happy home buyers while at the same time not too many happy realtors.

[@victordemoya2642]

What a video well explained, I’ll have one of those frozen ones tomorrow, thank you very much

[@jimgill5706]

Very, very good video about a problem that service techs will see almost daily in our trade.

[@brianbloomfield961]

I love your content. Trying to learn as much here. Appreciate every upload every explanation every details

[@acservicetechchannel]

Happy to hear that!

[@primordialsoup6476]

Thanks!

[@acservicetechchannel]

Thank you for your support and contribution! I truly appreciate it!!

[@eevallc3517]

Great video! A clogged drain line will also cause a frozen evaporator coil, the water will start to freeze and form ice on the coil.

[@acservicetechchannel]

Yes that happens on freezers but on ac units the saturated temps should not fall below 32 degrees to freeze anything, thanks!

[@Jesus-bs5fl]

Hi there, Craiglemmeachoo. Thanks for the video! Cute cat.

[@acservicetechchannel]

Our pleasure!

[@zipperdingo6385]

Craig, every video is just amazing, hugs bro

[@acservicetechchannel]

I appreciate that!

[@edlauren9434]

Thank you for this small but very informative video. Learned some new things from this video today.

[@acservicetechchannel]

Glad it was helpful!

[@edlauren9434]

Restricted air flow or insufficient air ducts, especially returns, is the VERY common issue with residential A/C systems. For brand new house construction deficient returns can be found on ~95% of the houses! The first house that I had to re-run almost entire air ducts was…. My own house:) It is VERY common issue!

[@deanmartin1966]

Good video. Just received your book. Reading through it now. Great tips.

[@acservicetechchannel]

Awesome thanks Dean Martin!

[@glennandvirginiamencer9794]

Was doing a furnace inspection last Fall and found the High Limit had been bypassed. Thinking the limit may be bad I put a new one in. That didn’t work. It is a 3.5 ton unit. It had 2 x 12” return ducts each 50 feet long , poorly installed and one was completely collapsed. This unit had been operating this way since it was installed. New return duct work was installed solving the problem.

[@jamesmooney5348]

Very good video!

[@josephnorcalusa1710]

Helpful information, thank you for sharing !

[@acservicetechchannel]

Thanks so much!

[@dano1234v]

Great video, things the owner needs to do because the builder cut corners, or hired bad contractors

[@mikeyh.8338]

Another airflow problem I have seen many times on mobile homes happens on down flow systems with a clogged or cracked / corroded condensation drain. The overflowing water will pour down into the 12" crossover duct, completely filling it and causing half of the home to have air, but no air to the other half of the home.

[@DD-ov2kp]

One thing I experienced lately was the blower spinning in the opposite direction creating static pressure and little airflow. Reversing the polarity (swapped positive and negative wire connections at motor) corrected the blower. The blower motor controller module was replaced previously and just happened to cause the motor to spin in the opposite direction, which wasn't noticed until the home owners noticed the AC would not get to the set temp.

[@caru3257]

I had a call back on dirty air filters. the filters were checked during the PM. I checked for a leak and when I was done; I decide to go under the house to check for damage to the ducts. I noticed the EAC and my first thought was to open it. the filters were slammed with dirt. I removed them and told them they had to get a price on a new coil.

[@hvacrjunky6119]

Great video that covers a lot in a short amount of time!! Definitely educational and practical.

[@acservicetechchannel]

Thank you very much. Yeah that was many many hours setting up scenes for that 8 minutes, thanks a lot!!!!

[@tedhicks5431]

Good job I see this crap alot now I found out the hard way bout the secondary heat exchanger clogging plus dont use those 3m filters unless you oversize the filter grill

[@RayRay-nb7tn]

Very nice explanation of the cause of low air flow. Most 90* elbows in a duct trunk is equal to 5ft of duct, not all but some are even more equivalent than 5ft. Most common I find is that customers like to move furniture around and cover the grilles, lolol. Maintenance is the Key, clean filter, clean coil. Spot on with all the causes. Very thankful for your professional expertise. HVACR ON AMERICA!!!

[@acservicetechchannel]

Thank you very much Ray, yeah couches against return grilles is a big one! thanks!

[@borshardsd]

Thank you for sharing. I rarely handle the ductwork on install or sales. You got me

[@acservicetechchannel]

Thank you for watching our video!

[@robertpalmatier2699]

Just ordered the refrigeration book on Amazon yesterday

[@acservicetechchannel]

Awesome, please let me know what you think of it after reading it!

[@portapottyflipper6957]

Craig is the GOAT

[@bz3248]

Good video lot's of information. 👍👍

[@acservicetechchannel]

Glad you enjoyed it

[@rodgraff1782]

The proper way to check airflow is with a magnahelic gauge. This should have been done on start up. Most residential equipment is designed to run at no more than .5” total external static pressure. If the pressure is higher, it will affect the CFM capability of the blower. You can take the reading on each side of the system to determine what is restricted, and then work from there.

[@beachwave2]

Excellent video. Thanks.

[@hamzahmohammad9918]

Can you make a video on how to figure out whether or not a house has enough supply registers and how to figure out if the return grilles are sized properly, please?

[@TheReason101]

I read the article what im dealing with is Low Vapor Sat Temp, high Superheat, Normal to High Subcooling, but i changed out the txv twice?

[@MaxShigs]

Any idea on how you would inspect ductwork with no access to attic and most ducting under the floor or behind drywall?

[@kaylalee20201]

A camera

[@tactup23]

A pressure test

[@MartinLDeLoach903]

The cat was very appreciative that you moved to the furniture just for it to lay across the supply register...

[@publicmail2]

Remember an open return or supply in attic or crawl is a 1 2 punch, not only are you losing that CFM to outside, but that same amount of outside air CFM must enter or leave the home to make up pressures.

[@Gordangekko257]

very informative and TY

[@thecreativehuman75]

2:37 for the win!

[@louisd95714]

My son's cat is his identical twin. LOL

[@romewizard]

16-year-old 2 ton AC outside unit and coil and gas furnace in the crawl space. Replaced with 3 ton outside unit and coil. Did not change the blower and furnace. I see extensive sweating around the coil, and all the ducts/return etc...; moisture build on the ducts work. Cool is set to high in the blower. Since we have increased the capacity of the AC unit to 3 tons, do I need to replace the blower motor? How do I measure what CFM currently motor is at.

[@Arthur-sz7uf]

Very informative video. Thanks again.

[@jeffbarron5500]

I worked 10 yrs for a school district, my 1st air flow issue was on a ancient 10t that had about 4-5" of ice inside and the sieve on a 3" shaft had spun, for whatever reason the key was gone, whomever had repaired it, was too lazy and opted to just drive the set screw into keyway and it destroyed the shaft ($2k,later)

[@sdsd4284]

Hey Craig as always great video very very important aspect that often times get overlooked. I HAVE 1 REQUESTS CAN U MAKE A VIDEO ON A DAMPER BOARD /ZONING BOARD HOW IT WORKS AND TROUBLESHOOT. WOULD LOVE TO GET A BETTER UNDERSTANDING ON THOSE I HAVE NEVER WORKED ON ONE BUT I KNOW ITS ALOT OUT IN THE FIELD. THANK YOU

[@acservicetechchannel]

Sd sd thanks for letting me know what you would like to see!

[@CharleswoodSpudzyofficial]

Thank you!

[@staceyhill846]

Awesome videos! Thank you, I found a flex duct in attic that had romex laying over it at the gable end of house, attic vent let sunlight in and broke down the flex so the romex tore through it and caused low flow to room.

[@mohamedsoud]

excellent explaining as usual craig. two thumsbs up

[@acservicetechchannel]

Thanks a lot Mohamed!

[@conradjohnson9115]

Have a Bad Evap Coil furnace Over Heats.Can you Remove the Coil & Run the Furnace Without TiLL the Summer then Replace it?

[@donnierobertson3088]

Great job and video

[@acservicetechchannel]

Thanks for the visit

[@rafr7027]

Thank you for detailed to the point info. You mentioned one reason for air movement slow down is the insulation get sucked in and blocks the air. In my case, when I have the ac on for maybe few hours, the air flow slows down on all vents, I listened to the fan blower and I did not hear any different sound than before. So in your advise it seems something is blocking the air flow. But when I turn the a/c off for 10min and back on, the air is normal, and it stays for a a while for another hour or so. My question is, is there something blocking as time passes or is it the coils icing, or can it be the thermostat? It is very coincident when the other day I removed the thermostat case and put it back, because the buttons were not working well on this, ti change time to program it. It's an old one. Any thoughts? Thanks.

[@SomnoNaut]

NOt a pro. I made the swtich from old mercury thermostats (two floors, one unit) to an Ecobee3. Best move I ever made. Having 2 second floor sensors instead of the main thermostat, and putting the main thermostat (with another sensor) on first floow allows me to see when the unit on/off and the remote temps at the time. This alone is worth its weight in gold.

[@zekenzy6486]

Great Video. Thank you for sharing . How do I check and diagnose bad Metering Device and fix , replaced it ? Thank you.

[@acservicetechchannel]

ZE Kenzy. Check out the articles I have on the website for frozen evap coil and liquid line restriction, thanks!

[@Eddy63]

Good vid Craig ...

[@acservicetechchannel]

Thank you!

[@Level-333]

I know 1” filters are disliked by many, but retrofitting isn’t in the cards. What 1” filter would you recommend? I like the fiberglass but I’m worried whatever passes through will land inside the system.

[@TheProtocol48]

I have a defunct electrostatic filter on a Carrier so now i use 18x21x1 inch pleated filters I get in a 2pk from Walmart, not a perfect fit but works.

[@frankmontez6853]

My insulated line connected to top of the inside unit has some ice and is wet . Not kicking in full power just partly running

[@Revon-Feuer]

Cannot figure it out, I have a very old noisy unit in what looks like a vented closet. The home is double-wide. The airflow through the vents is very poor and sometimes does not work at all.

[@dearlotos]

thanks for the video. Mine issue is a litle bit weird. the Airflow is ok when turn on the heat but only little airfow when use only fan or turn on tha AC. Have some technicians here to check but missed to tell me the cause. It would be very grateful if you could help to analyze.

[@gabrielflores9250]

I have this exact same problem, the a/c blows cold, but low air flow. Wondering what some troubleshooting ideas could be? 🤔

[@TheAdeptGuitarist]

I just cleaned the fan. 1/4in of dust on each one. It looked like a bunch of rectangles, didn't recognize there were blades there.

[@abegailkadam2171]

Very nicely explained,god bless you.

[@acservicetechchannel]

Thanks a lot! Appreciate the support!

[@LouisChiaki]

I wish there is also one for noisy HVAC.

[@erikh8685]

Very helpful!

[@owenlopez2550]

just purchased a house, and I turned on the A/C it probably lasted 4 hours to go from 80F to 71F, I put my hands over the vents and you could barley feel the cold air, now I'm watching this thinking damn I'm probably going to have to call an hvac guy.

[@stevecoleman6846]

What could cause cold air coming from a register during heating system in our first floor bedrooms but our back bedrooms, family room and kitchen receive warm air? We have gas heat, R-19 walls, 9” flexible insulated ducts and dampers above the furnace. Is it possible a duct came loose way up in the attic and the air being pulled by the return is pulling cold attic air into the duct?

[@Theferg1]

Great video and info!! Sir where are you located?

[@Kiddro22]

I have a High Efficiency unit. The heat exchanger would have to be removed to clean the underside of a “A” coil I’m guessing???

[@jamminwrenches860]

I have had so many people remove the filter (to improve performance lol) then replace it with a brand new one right before the service call. The coil wont lie, take pictures and watch their faces when presented with the bill for cleaning it. You suddenly know who told them it was a good idea to remove it cause they look at them all mad.

[@reidschnitker6705]

I love your videos maker more👍👍😄😄

[@acservicetechchannel]

Thanks a lot Reid!

[@willpartin622]

Thank you for all your great vids. I was wondering if you can ever have too much return ducting. After watching your videos, I checked my external static and found 3.5 and 3.5 for a total of 7 in WC . Filter drop is .18 INWC ( 5 inch air bear) and a\c coil drop is .21INWC. ( 2.5 ton N coil.) The temp rise is 70 degrees in heat mode. Rheem says 40-70 rise is okay , so I'm at the high end of acceptable . Shooting for 55 degree rise. I'm thinking I might need more returns and supplies but don't want to over duct it. Any help or advice? Also, when is was installed they added one 10' and one 8 inch flexible return duct. this is a 70,000 BTU Rheem 95% that replaced a 115,000 Ruud 95% furnace. Thank you

[@millenialmemoirs]

That static is way high. 2.5 ton system needs about 1000 cfm airflow, your getting less than 500cfm with the 8” and 10” return flex. Need to add a return or upsize those, you can’t have too much return. Sounds like you are really undersized on the supply side as well.

[@matty6848]

Are ducted systems still popular in America. Because from what I’ve seen when I’ve been on holiday to the U.S most houses seem to use ducted a/c & combustion units. In Britain where I live and most of Europe we tend to use more D.X a/c systems and for heating we have more wet heating systems with radiators etc.

[@throttlebottle5906]

yeah, forced air is still the primary HVAC source in majority of USA, although mini-splits get installed as supplemental source or in smaller new additions

[@matty6848]

throttle bottle thanks for letting me know. Is there any reason why you use forced air ducted systems? Or is it just more a traditional system you guys tend to go for?

[@davidgoodland6780]

Great. Thanks for the vid bud!

[@acservicetechchannel]

You bet!

[@charronfamilyconnect]

WHat about problem #21 being that the condenser coils on the AC are dirty and blocked with debris and dirt?

[@nigussiealemnew2315]

Thanks alot

[@ledzepfan7575]

What if you have supply ducts connected to the top of the plenum

[@jimbola77]

thanks, partner for sharing!!!!.

[@acservicetechchannel]

Thanks Jimbola77!

[@acservicetechchannel]

Thanks for driving during this time when everyone needs supplies too!

[@BarndoColorado]

I have a Energy Saving Products HV-140 with 42 vent and the unit wired for high speed. The back of the unit is open with a 25" X 16" X 1" filter. The unit doesn't seem to put out the air it should be putting out.

[@fcholman]

I think the kitty-cat stole the show at 2:35...

[@jasonludwig2488]

Will the combination of excess return on the first floor and lack of adequate return on the second floor weaken the second floor supply? In other words, the system overall is getting adequate return, but mostly from first floor. Would this floor-to-floor imbalance result in weak second floor supply? The second floor is hot in Summer by 5 or 6 degrees more than the first floor. I peeked into the first floor return and there's no duct work, just open to the whole wall/framing. Seems like it's pulling air into the return from places it doesn't need to. I was thinking of "ducting" it up with foam board and sealant to force the return to pull more air from the second floor just above that whole opening there. Also going to run jumpers from isolated second floor bedrooms to the main hall/return.

[@aaronpickett6441]

No, the first floors air would be cooler return causing a cooler supply. Sounds like all your cfm is going to the first floor and the second floor is receiving the left overs. Second floors will always be hotter. You may need a dampener system

[@TRICKAIRCONDCHANNEL]

Nice sir👍 Thanks

[@acservicetechchannel]

Most welcome

[@jacobsimanek]

2:30 cozy cat, excellent.

[@munawarsoomro6207]

Hello sir. Quick question about return grill too small or dip switch set wrong. Hime owner says systems had been working fine for years , the it can’t be bad installation right?

[@acservicetechchannel]

Just because it works doesn't mean it is working well!

[@skatir9]

I wish I could figure out why my system has low air volume. Its an older goodman ARUf with a time delay relay that has the purple wire in the COM on the relay and the black wire in the COM on the circuit board. I wonder if these need to be switched, as someone had replaced the motor recently. Hmm

[@ConsolingYourMind]

So i have a Duct that blows so much air and blows the most air it's a smaller duct, and i have it taped because of that. we just got a HVAC replaced. but it's not distributing enough air to the rest of the house. how can i fix this. thanks in advance. also our ducts are quite old. probably the seals are worn.

[@cherylcampbell7495]

The people that do our yard work (HOA) were taking their blower and blowing into my garage (closed door) and front door. I couldn’t breath and couldn’t understand why. I caught them so I know why now. Called my air conditioner people and the problem is dirty blower wheels. $400.00. Four year old air conditioner on the roof. Apt. Next month to clean it.

[@wrekitfin]

Great info

[@Nottiosama23056]

just installed a brand new AC system but my daughters room and my room air doesn’t flow with force it’s lagging tech told me something about 3 inch rubber where it should be wider to 7inches or wider don’t know who to trust no more

[@joescheller6680]

have a mobile home with the duct work inside blankey on both sides of home no way to inspect without destroying insulation blanket

[@WreckingCr3W2]

Very useful video

[@acservicetechchannel]

Glad you think so!

[@javimelendez414]

How would I know if the trunk is not sized correctly?

[@nobbee]

I lived in this house for 9 years before someone found that the furnace fan was set at low speed. Ugh. So cold in the winter.

[@fridgydownunder6734]

How do you measure or calculate each room in terms of capacity?

[@acservicetechchannel]

You would need to go off of a manual J calculation and to be honest, its much easier using a full computer program to determine each rooms btu loss and gain in order to determine the airflow needed in each room, thanks!

[@fridgydownunder6734]

AC Service Tech LLC can you do a video on that? Thanks

[@fornitemaster4286]

Mine blows but really weak and we changed evrey filter and it gets hot because no cold air any help

[@jonathanraul4086]

Ty nice video

[@acservicetechchannel]

Glad to help Jonathan!

[@johnrealdeal]

I've got a buddy that's supposed to come over but I figured I would give it a shot on here. My high temperature limit switch keeps killing my furnace. My filter is clean and even when I bypass my high temperature limit switch it's still shuts off and throws the same code. My buddy came over and clean the flame sensor because he thought that it was possible that the fan isn't aware it needs to kick on because the flame sensor was so dirty. Anybody has any more suggestions let me know. I've never cleaned my evaporator coils didn't notice a thing that needed to be done. I've lived in this house for 4 years so I know it's been at least 4 years that they haven't been cleaned. I looked at it from the top and it didn't appear to be crazy dirty. However I couldn't get a good enough angle to see it from the bottom.

[@markhoffmann5941]

#21. loose fan belt on a belt drive blower, #22 adjustable pulley not set properly or worn grooves, # 23 failing fan motor running slow, 3 phase motor running backwards, volume dampers closed too much,

[@kenfrievalt7826]

Is it possible for a duck to make a nest in a duct

[@acservicetechchannel]

That has to with migration patterns and the location of the building along with the visibility of the air conditioner from the sky!

[@garyhiland6013]

The duck may need to duck if the duct is undersized.

[@dwight.bennett]

19 problems a technician can fix and one problem that is intermittent and hard to price the repair of @2:31! 🤣

[@acservicetechchannel]

Yeah its a problem when a huge dog lays on a heavy gauge floor grille!

[@pimppappi702]

Thanks

[@nastynixon2046]

Hey Craig my Linux thermostat that will not come on And somebody had changed the wires and cut off the old one and added a Black pull out fuse nd the repair man is going take forever I would like to see like a fix myself can You are someone help please I'll Email you a picture

[@throttlebottle5906]

ahh, the game of find the supply registers, only improved upon by the game of "find the return grilles" why doesn't my system heat and cool? you can hear the ducts screaming like a banshee upon entering, well uncover, clean and open all the vents..... I've seen countless of them covered over because "they gather pet hair and dirt", yeah, that's why you have a vacuum cleaner I reply (facepalm)...

[@acservicetechchannel]

Yeah and some techs don't want to ask to go through the building but I find that I need to in order to get the system as a whole approach. I only need to see everything to anticipate what problems we are going to incur next, thanks!

[@fastcar42069]

3 ton system (oversized tbh) 9 supply runs of 6 inch pipe, so roughly 900cfm they got 5 runs closed off and even had 3 of them covered with giant magnets to keep their rabbits from getting cold sooo.... 4 6 inch runs to pump some wimpy airflow for 3 tons of air conditioning in humid illinois. Yeah they were pissed when i gave them an earful about their bullshit. They cooked the outdoor unit from years of that bullshit too, i couldnt get the charge dialed in right anymore. Gave up and told them to keep all the registers open from now on and control the temp off the thermostat like a normal human being.

[@tommyho6437]

i think ductless split unit is the future....

[@acservicetechchannel]

I think you are right!

[@Fox9582]

2:36 what air supply are you talking about? 🤣

[@joleneweaver7578]

Just my bedroom is the only one that doesn't flow properly