Keep light bulbs clean Clean bulbs give off 50 percent more light than dusty ones, giving you all the light you’re paying for.  If that turns out to be more light than you need, try a smaller bulb. Check seals on refrigerator and freezer doors Magnetic door seals can weaken their grip on the edge of the refrigerator or freezer cabinet.  Test the seals regularly by closing a piece of paper in each door at several places around the perimeter.  If the paper pulls out easily, the seal is weak.  You may need to adjust the door or install a new seal.

Keep your refrigerator cool
When a refrigerator is surrounded by warmth, its compressor must work overtime. A decrease in 5 degrees in ambient temperature can cut energy consumption by 20 percent.  To keep your refrigerator cool, allow about 2 inches of airspace between the appliance and nearby walls and cabinets; doing so offers an escape route for heat from the compressor and condensing coils.  Shield your refrigerator from direct sunlight, and position it as far as practical from the stove, dishwasher, and heating vent.

Blue flame is good!
In gas stoves, ovens, water heaters, and the like, blue flames mean efficient burning.  If flames are yellow, try increasing the air supply by adjusting the shutter, which is usually located under the stove top.

Degrease the oven door seal
A tight seal between the oven door and the cabinet will ensure maximum heat retention.  Gently clean the seal and the cabinet where they meet with hot, sudsy water or a general-purpose kitchen cleaner, dabbing the liquid onto the mesh seal with a cloth.  Take care not to move or damage the seal.

Plug air leaks that raise utility bills by letting outdoor air into the house
Less obvious leaks can occur where plumbing, ducting, and electrical wiring penetrate exterior walls.  Having your home tested with a blower door will help to identify and cure the problem areas.