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A packed freezer is the best way to keep the biggest energy hog in the home running more efficiently; frozen food needs less energy to stay frozen and it helps keep the freezer at the optimal temperature. Dip food in water and then place it inside a freezer bag; the ice coating creates an extra layer of protection that prevents freezer burn. Hot foods (soups, sauces) should be cooled at room temperature, then placed in the refrigerator to chill even more and then eventually placed in the freezer; the foods will freeze better. Never refreeze foods that have thawed; freeze does not kill bacteria.