I just got my bill for Nov. and Dec. It's $599.00 House is 4600 square feet, all electric, on geothermal and I heat the attached 650' garage to 56 degrees. I'm hoping to have the radiant heat on in my new 1360' shop next winter and see what those costs are before deciding on a waste oil boiler which I would also use to supply some heat to the house. Power here is just a little over $.14 KWH. Summer usage is about $250.00 for two months keeping the a/c at about 74 degrees. Total for last year was a shade over $2500.00. Not cheap, but hard to justify cutting wood or putting up with the heat