Your utility probably also offers programs to encourage energy efficient lighting, heating systems, appliances, etc. Central heating systems should have regular tune-ups to ensure they're running safely and efficiently. Be sure they are set to manufacturers specifications. Newer units are as pleasant to use as old water-wasters but save water and energy. For safety, use a thermometer to confirm that the temperature at the tap nearest the tank is no more than 120 degrees.
Fireplaces are notorious energy hogs because they require a tremendous amount of air.
Even when you're not burning warm air races up the chimney. To reduce heat loss, install and use glass doors. Keep the doors and damper closed whenever there's no fire in the grate. Use compact fluorescent bulbs for outside lighting and indoor security lights. Contact the Energy Outlet or your local electric utility for information on choosing the best bulb for your application.