Make sure your freezer is the ideal temperature. By keeping your freezer at 0 degrees Fahrenheit, you actually can reduce the amount of energy you use.
Keep the freezer door closed. Make sure your door seals are airtight and minimize the amount of time the freezer door is open, so you can keep the cold air in and the warm air out.
An easy way to make sure your freezer is efficient is by making sure it's never empty. Keep your freezer full, and it won't have to work so hard to keep cool.
Leave a space between your wall and cabinets and your freezer to allow air to circulate around the condenser coils.
ENERGY STAR® compact freezers use at least 10% less energy than required by current federal standards.