Replace incandescent lights with fluorescent or LED lighting. If this is not possible, reduce the wattage of light bulbs in lamps and light fixtures. This also reduces the amount of heat the air conditioner has to remove.
Set your thermostat at 68 degrees Fahrenheit during the day and 60 degrees at night or when you are away from home for more than four hours. If you have a heat pump, set your thermostat back no more than 3 to 4 degrees.
Keep the fireplace damper closed unless in use. An open damper can be compared to keeping a 48-inch window wide open during the winter. Close the damper as soon as you are certain the fire is completely out.