We've been there 2 yrs and the home is like 3,400 sq - its kinda gonna go like this
Gas > Summer months $15/20 ... Electric Summer $300+...Our highest was like $350...I keep the house cold and when sports are on, every TV in the house runs.
Fall/Winter - Gas typically between $150/225 ... Electric then falls off to around $125+ ... This is during football season and again EVERY TV is running ... I'm not in the running for energy conservationist of the year
Water/Sewer, DoBoy is right, around $100...$140 summer with irrigation running