We live in southern Tennessee, where it's been hotter than Vulcan's anvil this summer. Winter cost is around $70 a month because our house (three bedrooms) is largely heated with natural gas. Summer creeps up as the temperature increases and the central air conditioning is used more. It generally tops out at $240 in the month with the hottest weather.

We did join the electric company's stakeholder plan to build a solar electric "farm" and should eventually start seeing lower electric bills.