A freezer is a special type of refrigerator that stores food at freezing temperatures. Inside a freezer, it is normally -18 °C (0 °F). Freezers can be found in household refrigerators, as well as in industry and commerce. When stored in a freezer, frozen food can be stored safely for a longer time than storing at room temperatures.
Domestic freezers can be a separate compartment in a refrigerator, or can be a separate appliance. Household refrigerators usually have a separate compartment where the heat pump is used to pump even colder temperatures to the contents. Most household freezers maintain temperatures from -23 to -18 °C (-9 to 0 °F). Some freezer-only units can achieve -34 °C (-29 °F) and lower. Most household refrigerators generally do not achieve a temperature lower than -23 °C (-9 °F), because it is difficult to control the temperature for two different compartments. This is because both compartments share the same coolant loop.

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