A couple of years ago we replaced the inside heat/AC unit (don't know the technical name). Last August the outside unit (heat pump?) finally died and we replaced it. We had no problems with the AC as it ran in the summer, but once the weather got cold and we started using the heater, we've had nothing but problems.

When the heat is on, the thermostat is set for 69, but once that temp is reached, the heater continues to run. We've been awakened in the middle of the night with the house temp at 81 and the heater still running. Also, the heater will not turn off when this happens. We have to turn on the air conditioner and let it switch over so we can turn the system off.

Since this problem began, the company that installed both portions of the system has been out to look at the problem several times. So far they've replaced the thermostat twice, replaced a circuit panel in the outside unit, and replaced the pipe that goes from the outside unit to the inside unit (a lovely pipe that's now attached to the outside of my house because they didn't want to cut into the wall).

I'm getting ready to call the company again, but maybe someone here will have a suggestion. This is a Lennox system, and it wasn't cheap. I'm ready to tell them to come get it and call someone else.