Weatherproof your home
Energy is expensive enough as it is without warm and cool air seeping through the cracks and hiking up your bills. The average American household can save about 10% to 20% on their overall energy bill with some of the proper insulation techniques recommended by the U.S. Department of Energy.
Ask your favorite hardware clerk about caulk, weather-stripping tape and other materials for sealing your home tight. The salesperson can probably give some pointers, and there are numerous online tutorials. Also, make sure your window coverings are adequate for blocking out the sunlight on hot summer days.