Thats the only thing to wonder about. I would say if you frequently see 25 f. or lower through the winter it may not be right for you. If you stay above in the majority, the heat pump with nat. gas backup is just what you need. By the way if your home is 2800 sq ft or less, and has one system, a 15-16kw standby gen will take care of you. They start at around 3000 on e-bay direct from fact. w/warranty delivered to door. They run on nat. gas. Generac is a darn good brand and I have installed quite a few. Good luck! P.S. an electric backup in furnace is commonly 60 amps, and boy will your meter spin!!