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Frost Free Fridge Freezers Frost-free fridge freezers circulate air to keep frost from forming on the evaporator in the freezer. If ice does form on the evaporator, it will inhibit air flow and cooling problems will arise. This can cause food items to be obstructed, affecting the taste and smell. It also takes up space. It can also force the fridge to work harder and consume more energy. Cost Frost-free freezers eliminate manual defrosting which can be a lengthy task