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How to Keep Your Fridge and Freezer Frost Free If your freezer is stuffed with leftovers or frozen food, it will not defrost as quickly as one that has enough space to allow air to circulate. If you wish to prevent freezer frost, keep your freezer completely empty to ensure air circulation and remove any leftovers regularly. Fridges that automatically defrost (or those with manual defrosting) contain rods in the back of the freezer wall. They heat up and melt frost. Frost free functions like an air circulator.