Choose a refrigerator size based on the needs of your family - a refrigerator will use a little less energy when it is comfortably full (but not overfilled).
Thick frosts reduce your refrigerator's cooling ability. If you don't have a FROST-FREE model, defrost your refrigerator when frost is 0.6 to 1.3cm thick.
Don't open your refrigerator door needlessly. Have it open as short a time as possible. Decide what you want to get out before you open it and remove several items at once, you'll reduce loss of cold air.
Cool hot foods slightly by letting them stand before placing in your refrigerator. (But to prevent bacterial growth allow no longer than 2 hours).
Be sure the seal around your refrigerator is intact. If you shut it on a sheet of paper anywhere round the edge, it should grip it.
Cover all liquids stored in the refrigerator (especially frost-free models). Besides stopping them picking up taints, this will stop them evaporating away. Anything that evaporates inside the refrigerator will form as frost on the evaporator and take more energy to melt off.
Don't place the refrigerator near the stove or against an un-insulated wall facing the sun.
Allow adequate space above, behind and on the sides for free air circulation - at least 20 mm at the sides and 50 mm at the top and back but the more the better. Don't cover your refrigerator with any material that will prevent air flowing around the cabinet sides.
Thaw frozen foods in your refrigerator rather than on the bench.
Don't run you refrigerator or freezer compartment colder than you need them.
If you are buying a new refrigerator, buy an efficient one (look at the energy label). The cost of electricity to run a refrigerator for its life will be equal to about half of what you pay for it to begin with. It is well worth while to buy a more efficient one.
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