A Fast Freeze function to rapidly cool foods by running the compressor for a predetermined amount of time and thus temporarily lowering the freezer temperature below normal operating levels. Keep the refrigerator temperature at or below 40� F (4� C). The freezer temperature should be 0� F (-18� C). Check temperatures periodically. Appliance thermometers are the best way of knowing these temperatures and are generally inexpensive. Yes, a freezer should be cold enough to freeze your food. But if it's too cold then you risk an increase of frost and ice build-up. If you notice that your refrigerator feels warm, but the freezer is very cold, then your defrost heater might be defective. Deep Freeze may refer to: 'Deep freeze' proprietary name for Racemic menthol cooling gel for non-prescription medicinal use such as sports injuries. 'Deep freezer' or chest freezer, a stand-alone freezer unit for preserving food in contrast to a freezer atop a refrigerator.