I have a dual-fuel system, heat pump with gas aux. I have noticed that the external temperature as displayed on the thermostat rises several degrees when the unit runs (5 or more degrees). I am wondering if this could cause the unit to sometimes switch back and forth between heat pump and gas when it is really cold enough to use gas exclusively.
I assume the problem is that there is some waste heat near the unit while it is operating, and the temperature at the probe rises. Is this normal?
I am thinking of remounting the probe a few feet away from the unit.