Our downstairs unit runs off of natural gas in the winter........it is a "gas pac", electric in the summer and gas in the winter. The upstairs unit is a heat pump, which is totally electric. We also have a wood burning stove as well as a kerosene heater. As long as my birds are warm enough, the rest of us will be fine, I'm sure. I'm trying to add layers and prep everyone to dress warmly because I do NOT want those units running constantly!

Logan