Something isn't right with your central heat unless it's all electric. Do you know what type of heating it is? Gas, propane, heat pump? I live in the Northeast and my heating bill is less than $250 a month during the coldest months.
its all electric. Gas is not standard in new construction here, it has to be specifically ordered by the homeowner, due to the fact that hardly anybody has gas lines ran to their property. Nothing in this house is gas.