We built a new house in 2005-2006. Early 2006 we had a Carrier Infinity heat pump installed. I believe it was 17 SEER with 9 HSPF. The cost in the summer isn’t bad at all, but the cost in the winter is killing us. The auxiliary heat is staying on about 80-90% of the time. We are using the Carrier programmable thermostat (66 at night, 70 in morning, 66 when we leave, 70 in the evening). After some research here it looks like the 4 degree difference is making the aux heat come on. The part that gets me worse is that the aux heat comes on to even keep it a 70. It’s been mid 50s and sometimes in the 60s outside and the aux heat comes on to keep it at 70. From some previous posts I read, I probably need to call the tech, but that brings up another problem. The HVAC contractor is one of the contractors I don’t recommend when I talk to other people thinking about building. For one thing, one of them stole some copper pipe from the house when they were installing the system (there were also several other problems during the install). I called last winter (06-07) and told them about the aux heat problem and the tech told me “that’s normal”. I would probably call someone else, but I bought a 10 year parts and labor warranty from them. I’d like to have an idea about how it should be setup before I call them again.
- At what temperature should a lockout be set, to keep the aux heat from coming on?
- Should I just set the temp of the house to 70 and not use the programmable part of the thermostat (that don’t seem right though)?
- Is there a way to keep the aux heat from coming on in the 4 degree increase?
- Is there any other information I need to know before calling?
Many, many thanks for any help!!!