here in cali if u go over a certain KW they charge u double the price. i run a 1000 + 400, the 1000 watt runs 12 hours and the 400 was running 18 and my bill jumped 150 a month. i am also running 12000 btu ac for 8 hours a day, my central air runes like it normally dose. u should look in to programs they have if any to lower ur bill. last year my wife and i went to montana for 2 weeks. well they closed out the account we had, it was in her x"s name, i got a 500 dollar bill for 2 weeks, we werent even home. this shit went on for 5-6 month by this time i owed 3,000 dollars. we finally compared bills and their was different rates and account numbers. we called them and they told us that it was because we started a new account, suprized as hell i told her we didnt know anything about it and the rate changed. we were on a care plane that was a lot lower rate. so they switched to to the program. i asked them why they didnt say anything about this program to began with, they said that ant are job to tell u about special programs. there janeky fuckers they is.