Open the doors only as long as necessary and make sure they fully close. Loss of cold air results in unnecessary operation and increases the amount of electricity used. Check to be sure the light goes out when you close the door, by depressing the button located on the door frame. The coils are at the bottom or rear of the refrigerator. If they are allowed to accumulate dust and dirt, as much as one-fourth more energy is required to maintain proper temperature.
Dirty coils can also contribute to the premature failure of the refrigerator motor.
Use a refrigerator coil brush or a vacuum to clean the coils. For safety reasons, always unplug your refrigerator before cleaning the coils and take care not to disturb any electrical wires. Check the door seals for a tight fit. First remove any dirt or grime. Then look for cracks, gaps, and damage.