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How to Keep Your Fridge and Freezer Frost Free If your freezer is stuffed with leftovers and frozen food items, the air won't circulate as efficiently as if it was empty. If you want to avoid freezer frost, keep your freezer empty to allow for good air circulation. Also, take out any leftovers as often as you can. Refrigerators that automatically defrost (or those that have manual defrosting) have rods in the back of the freezer wall that heat up and melt frost. Frost-free refrigerators have a fan which circul