we have two heat pumps and air handlers, (i have no idea what i'm talking about, so ignore me if i'm way off) and the new one we have a great. the ones that were presents when we moved in were way to anemic, and could never heat the house properly. we have a weird situation where we're all electric, and the electric is cheap. we do have a propane tank, but not the large ones to heat the house. the only time it gets pricey is if it drops to below 10 or so for extended periods of time. then it will run constantly, and we can have bills in the $450-500 range. that being said, we crank the air in summer, have our pool set to 87-90, and it may cost me $200 a month.