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Frost Free Fridge Freezers Frost-free refrigerator freezers circulate the air to keep the formation of frost on the evaporator of the freezer. If ice builds up on the evaporator, it will hinder air flow and cause problems with cooling. This can cause food to be obstructed, affecting the flavor and odor. It also occupies space. This can make the fridge work harder and use more electricity. Cost Frost-free freezers can be defrosted manually, which can be a tim