There are a number of things you can do to trim heating bills [1] in the winter and keep your cool in summer. Make sure hard-won comfort stays indoors by bulking up insulation, sealing leaky ductwork, and adding new weatherstripping to drafty doors and windows. Create climate control with a programmable thermostat. Keep heating and cooling systems in tune with annual service inspections, and be vigilant about changing filters. And if you’re able, begin replacing inefficient windows [2] with Energy Star qualified models, which will improve your home’s value as well as its indoor climate.
Links:
[1] http://www.moneypit.com/article/tips-reduce-heating-costs
[2] http://www.moneypit.com/audio-q-a/replacing-energy-inefficient-windows