Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 7/21/2015

Central ac is blowing hot air in two rooms of house

Central ac is blowing cold air in front of house but the back two bedrooms are blowing warm air.

Do you have the same question? Follow this Question

3 Answers

Angie's List Member Answer

Angie’s List Members can login here to view this answer.

Not an Angie's List Member?

Join to view this answer. Members also get reviews on local service providers, plus save up to 50% on popular home projects from top-rated professionals!


Very unusual. Possibly uninsulated ducts to the back bedrooms,but even that I'd think the air who not be "warm". Can you tell us more? Type of system,did it work well in the past,new issue,any work/repairs done recently??


Answered 5 years ago by BayAreaAC


As BayAreaAC said - odd, especially if this is a new thing.

You can respond back using the Answer This Question button right below your question, as if you were answering your own question.

Assuming this is new, I would guess either a lot of hot air blowing across the ducts at the back of the house (open door on basement or crawlspace and very hot outside temps maybe ?), you have two A/C units and one has failed, or you have a heating pump with separate heating elements front and back of the house, which would be odd but happens - and one of those elements is one - perhaps because back thermostat was bumped up ?

Couple of other possibles - you have a two-zone system and the back zone has turned almost all the way off, so airflow is very low and heating up before it gets there; or you have an opening in the duct or inspection plate fell off in the duct to the back rooms that is allowing the airflow to pull in outside hot air with it (by venturi effect), causing dilution of the cold air so it comes out warm. Ditto to "duct tape" on joints that came off and is letting a lot of dilution air into the back half of the system.

Also, if a zoned system using a duct splitter valve or "gate" or "damper", if the gate or damper solenoid fails you could lose most cooling to one zone - ditto if it came loose or spring broke and it moved, or a kid played around with the control arm setting.

You said "central air" - but if a mini split system (ductless), with individual fan and evaporator units mounted on the wall in various rooms, if the evaporator flow valve fails in one unit, the fan might work but you would not get cooling, so you would get room temp air circulation from that unit.

Ditto with the A/C only ducted systems (commonly round flex ducting) that use fans in the rooms to move the air rather than a central air handler - if the ducting gets separated or torn, can pull in warm air at the damaged place and blow that around.

Another distinct possibility - especially if attic-run ducting - two zone system and the return ducting for the back rooms came loose or broke, so you are getting hot outside or attic air for the return air, which the air conditioner cannot then cool enough - especially if return air comes in after rather than the evaporator (though that is poor practice).

Either way, you need a Heating and A/C contractor to track down the issue probably, unless you are a good DIY detective.

Answered 5 years ago by LCD


Here are a few more links FYI on the general issue of unbalanced airflow or hot/cold rooms that might help too - some relate only to a potential two unit A/C system for your case -

Answered 5 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy