I have a pair of heat pump/ac units. One for the lower, larger area of my home and one for the smaller upper level of my home. Both have Janitrol HPT18-60 thermostats and both units have aux heat coils in the blowers for "emergency heat".
In a previous home i switched out old mercury switch dial Honeywells in favor of Home Depot type electronic programmable thermostats and this was a money saving upgrade to my old oil burner I believe.
However in this case I have heard on home improvement cable shows that electronic programmables often DECREASE the effeciency of heat pumps with aux heat. Is this true? Any help is appreciated. I want to save money, not throw it away.