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Choosing a Small Frost Free Fridge Freezer Frost can cover and build up in freezers, leaving less space for food. It also covers temperature sensors and vents which makes the freezer work harder. Preventing frost is as simple as keeping the humidity low, closing the freezer door with a secure latch, and avoiding frequent openings. However, these actions aren't always enough. Here are a few examples of Frost-free freezers eliminate the necessity of manually defrosting the interior, preventing the accumulation of frost. They do this by using a timer and heating coil