Lower your thermostat. Try reducing your usual daytime temperature by at least one degree. For each lowered degree, you'll save one to three percent off those heating bills. At night, turn down the thermostat to 60 degrees: It's much healthier, you'll feel better when you awaken, and you'll save money. If you go away for a weekend or more, lower thermostat to 55 degrees.
Run bathroom and kitchen exhaust fans less. Exhaust fans pull warm air out of the house and let in cooler air that will need to be heated. Use fans only when necessary.
Close the damper on your fireplace when not in use. If not, your chimney will draw warm air out of the room and create a draft.