I guess if the wiring is correct, I'm left to wonder what the problem may be. It just doesn't seem right that a new unit would be using considerably more electricity compared to an old one in the winter. I haven't seen many complaints on here about the electric usage so it seems like something must be unique with my situation. All the numbers that the installer tested for appear to be inline with what they should be so I don't know what to think now. I guess I have until May to decide to have them rip this unit out and try something else but as far as efficiency is concerned, I didn't see too many units out there that were as efficient as this unit was so it'll be fun trying to find an alternative system.