I'm glad , too, as I learned our bills are also pretty high. I have the same questions you do about what contributes to other people's bills, including square footage, amount of people/high energy using pets in household, insulation levels, energy efficiency of appliances, presence or lack of HVAC or window a/c heating/cooling, structural integrity of household structures ie are windows/doors well-sealed, and so on. It might make excellent formal poll material, though the amount of questions one could cram is almost endless!