Install a programmable thermostat.

 “If you use it to set back the temperature by 10 degrees for eight hours every night, you'll lower your heating bills by 10 percent. A $50 digital thermostat can pay for itself in energy savings in less than a year. “

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

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Don't set the thermostat higher than you actually want it.

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