Frost acts as an insulator and forces your fridge or freezer to work harder. Auto-defrost refrigerators take care of this problem for you but use more energy. Make sure your refrigerator and freezer doors seal airtight. Close a dollar bill or piece of paper in the door. If it pulls out easily, your refrigerator may need a door hinge adjustment or a new gasket.
Dirty coils make the refrigerator work harder and use more energy.
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