Have the duct system inspected to be sure it is properly connected, sealed tightly, and well insulated. If your home is heated electrically, consider installing an energy-efficient heat pump system to save 30 to 40 percent on your heating costs. A heat pump is most efficient in moderate climates such as Southern California. Invest in a programmable thermostat that will raise and lower the temperature according to your schedule. It will pay for itself in a year or two.
Windows provide views, natural lighting, ventilation, and solar heating in the winter.
Unfortunately, they can also account for 10 to 25 percent of your heating bill. In warmer climates, select windows with spectrally selective coatings to reduce heat gain. Install storm windows to reduce the heat loss through the windows by 25 to 50 percent. Passive solar design can be very effective for saving on heating and cooling costs. Placing large insulated windows on the south walls with a heat-absorbing slab, may keep your home warm all day without using the furnace.