For those of you with a dual fuel system, where do you find that you like to cross over to the furnace from the heat pump?
I woke up last night and noticed that the heat pump was on for an extended period.
The temperature outside was 9 degrees F, and the inside temperature was a degree or two below my setting of 67*.
So, I switched the system to Emergency Heat, (which is our propane furnace), and will switch back later today when the temps rise.
Any idea of where the generally accepted changeover should take place? I realize that there are differences based upon homes, prices of electricity vs. fuel etc, but I'm speaking more from the point of view of the system laboring to keep pace with the cold and efficiency.
Thanks.