Since the beginning of December when a honeywell VisionPRO TH8000 series was put in, the heat pump has not been throwing heat. The guy doing the work has changed the contactor, defrost control board, and refrigerant and when on the phone with honeywell to try to troubleshoot the problem, they said it was the compressor. Rather than go through the issue of replacing this and possibly not work, he put in a Ducane heat pump, initially had a Bryant. The heat pump still will not throw heat. We are running our Emergency heat which is propane. He has no idea as to what it may be, and plans on trying a different thermostat to see if the problem is with that, and contacting honeywell again. All fuses have been checked and are fine. Just looking for a little bit of advice on what may be wrong, and would be greatly appreciated.