Very likely. I know someone who accidentally had the switch on heat pump in the wrong position--and had a horrifying power bill.I only have a heat pump, so it's not going to be able to keep up with 8 degrees F.
Thinking of running the Emergency Heat on the two units to see if that works, but would probably need to sell my truck to pay for it.
I think I said this before here, but I lived one place with a heat pump and woodstove for a few months. During one cold snap, when the heat pump struggled, I put that stove into use.


