A freezer is an appliance with a thermally insulated compartment and a heat pump to cool and maintain the temperature in the inside of the freezer below the freezing point of water. Freezers are most often including as a compartment of a standard refrigerator, but they are also available as stand-alone appliances or built into the kitchen. Stand-alone freezers may be found in households that store high quantities of frozen goods, but most freezers are used in commercial applications within food service industries. Since the 1940s, the configuration of the freezer on top and the refrigerator on bottom had been the most popular refrigerator organization. Recently, many combination refrigerators with freezers include chilled water, defrosting, and an ice dispenser in the door. Through the development of the freezer, frozen foods, previously a luxury, became commonplace.
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