With all of this heat and discussions about insulating materials, I just wondered want kind of electricity bills are you 2 coolers getting. Received mine yesterday, $400.00 for a 3000 sf home. I don't know if thats alot compared to yours but that's a 70% increase from last years bill. And the 2 hottest months are still around the corner. Any recomendations for do it yourself insulation materials?