Have your heating system inspected regularly

“especially if it's natural gas. A $50-100 annual tune-up can help reduce your heating costs by up to five percent. “

http://www.powerhousetv.com/Energy-EfficientLiving/Energy-savingsTips/027471

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If you have a forced-air furnace, do NOT close heat registers in unused rooms.

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Change or clean your furnace filter once a month