It worked fine all summer until last few months. When I have it to cool it blows air but not cold air. Now that I want heat it blows cool air and not hot air. It took it 30 minutes to heat my 1000SF home from 64 degrees to 65 degrees. What could be the problem?

Circuit breaker size for a carrier unit model number fb4anf018 I got this unit from a model home as a garage booster, no info on the unit as to max breaker size. I bought a 40 amp dbl pull to wire it up. Also there are two black and one yellow, am I to assume both black wires attach to the white...

Live in mobile home with an intertherm unit outside unit is no longer running didn't know if it even needs to be running with the heat

Please let me know what factors should be measured to assertain the capacity of a AHU or a Packaged unit. What does it mean by on coil temperature and off coil temperature ?

I have a heat pump and ac unit outside. The inside blower fan still working but the outside unit humming. Are there any quick fixes here