The appliance replacement most likely to produce the greatest energy savings is your refrigerator. An older fridge can cost about $20 to run every month. Replacing an old fridge with a new ENERGY STAR®-rated model can cut that down to less than $5 a month. The ENERGY STAR® label certifies that the appliance saves energy. New refrigerators will include an additional label, the Energy Guide label, which shows how much energy it uses annually and compares that to the most and least efficient models available.