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Choosing a Small Frost Free Fridge Freezer Frost can cover and build up in freezers, leaving less room for food items. It also covers temperature sensors and vents, forcing the freezer to work harder. Keeping humidity levels low by closing the freezer door with a secure seal and making sure that the freezer door is closed at all times are important ways to prevent frost. However, these measures aren't always enough. Features Frost-free freezers do away with the need to manually defrost