Hello, My husband and I are building a house in Bellefontaine, Ohio, and we have had some conflicting information given to us. Some tell us to do all electric geo unit, such as climatemaster or waterfurnace, and some tell us to do a carrier geo system with a propane backup furnace. The winters get very cold here, but we are doing sprayfoam insulation. I've heard of people with very high electric bills during colder months with the all electric unit using backup heat strips when the geo can not keep up, but today I had an installer tell me that doing a propane backup is not the way to go? Any information would be helpful. Electric or propane backup?