2 adults here, in our little 2 bedroom unit in summer the power bill is about $140, and goes up to $200 for a couple of the coldest months over winter. I have the one tiny cube tank heated to 19 degrees in the garage, 2 little tanks in the house. We heat the bedroom at night and the computer room in the morning until the sun arrives. I dry as much washing on the line as I can throughout winter so only have to finish things off in the dryer most of the time. I'd really like to have a warmer house but it costs a lot. Gas was the best heater we had but I don't like the condensation and damp that followed using it. We are moving soon to a house with carpet, and lots more sun so I look forward to a warmer living room. :happy2: