A device that maintains a temperature below the freezing point of water is called a freezer.
Freezer units are used in households and in industry and commerce. Food stored at or below -18 °C is safe indefinitely. Most household freezers maintain temperatures from -23 to -18 °C, although some freezer-only units can achieve -34 °C and lower. Domestic freezers can be included as a separate compartment in a refrigerator, or can be a separate appliance. Domestic freezers are generally upright units resembling refrigerators or chests. Many modern upright freezers come with an ice dispenser built into their door. Some upscale models include thermostat displays and controls, and flat-screen televisions have even been incorporated.