Seal up the heat leaks. Seal the heat leaks around windows and doors with caulking. Look for places where you have pipes, vents or electrical conduits that go through the wall, ceiling or floor.
Replace your old gas appliances with an ENERGY STAR® water heater or furnace. If your gas water heater is more than ten years old, think about replacing it with a newer, more efficient model. The best indicator of a water heater’s efficiency is the Energy Factor (EF). The higher the EF, the more efficient the water heater.
Eliminate wasted energy. Turn off lights in empty rooms. Shorten showers. Simply reducing that lingering time by a few minutes can save hundreds of gallons of hot water per month for a family of four. Cutting your showers in half will lower your water heating costs by 33 percent.