New central a/c unit will not shut off. How can I get it to reach desired temperature?

Question

A new furnace and a/c compressor were installed in the middle of summer last year, and they will not shut off (reach the desired temperature) of 70 degrees in the house. The house is not very well insulated, and suffers from old windows and doors that are not fully sealed. What steps can I take to eliminate the problem on a low-cost budget since we are renters? Thanks in advance for any help towards a solution

Answer 1

um, it sounds like you already know the answer. the t-stat is not recognizing the set point. assuming it's a new t-stat, and not faulty, i would bump it up to 73-75 degrees and see if the unit cycles. if it does, you simply arent reaching the set point. 70 f is very cool....from what you say and the set point you have, its just not reaching the temp where unit shuts off. bump up the t-stat and see if unit cycles. this issue is very fixable!

Answer 2

one thing you failed to mention is how hot is it outside, a heat pump will run until t-stat  temp is met, if its 95 out side chances are it will not shut off. make sure cool air is coming out of the vents there should be about a 20 degree seperation between stat and vent air, example t--stat set to 70, vent air 50..if you are not getting that then, the unit needs simply replaced,  other than that time to insulate the house or find a new place to rent

Answer 3

HVAC Tech.:  The sources of  heat gain you describe will overwhelm your a/cs ability to reduce the temperature. The more you can block the outside (hot) air from coming in the more effective the a/c can be.Insulate and seal what you can, it will help. Change the return air filter to keep the system at maximum performance, once a month, more often if needed.

Answer 4

turbine or roof vents get the heat out of attic it wont infiltrate living space thus cooling the house

Answer 5

check with the installer. unit too small or not working right.  check in air and out air for a 18 to 20 differential.