Originally posted by: Hoober
I had a heat pump put in this past summer instead of a traditional A/C unit. We didn't rip out the traditional natural gas-fired furnace, though. There's a thermostat on the heat pump that signals the control board the outdoor air temperature. If it's below 40 degrees F, the control board uses the furnace to satisfy calls for heat. Otherwise, it uses the heat pump.
What you did is becoming more and more common. Esp now with gas/heating oil getting so high. A lot of new builds do this now as backup if one, electric/gas/oil, get to high you have the other to fall back on.
