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*’freezer units’ are used in ‘households’ and in ‘industry’ + ‘commerce’*
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Food stored at or below −18 °C (0 °F) is safe indefinitely
Most household freezers maintain temperatures from −23 to −18 °C (−9 to 0 °F), although some freezer-only units can achieve −34 °C (−29 °F) and lower.
Refrigerator freezers generally do not achieve lower than −23 °C (−9 °F), since the same coolant loop serves both compartments:
Lowering the freezer compartment temperature excessively causes difficulties in maintaining above-freezing temperature in the refrigerator compartment.
Domestic freezers can be included as a separate compartment in a refrigerator, or can be a separate appliance.
Domestic freezers may be either upright, resembling a refrigerator, or chest freezers, wider than tall with the lid or door on top, sacrificing convenience for efficiency and partial immunity to power outages.[20]
Many modern upright freezers come with an ice dispenser built into their door.
Some upscale models include thermostat displays and controls, and sometimes flat screen televisions as well.
Home freezers as separate compartments (larger than necessary just for ice cubes), or as separate units, were introduced in the United States in 1940
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*’frozen foods’ – previously a ‘luxury item’ – became ‘commonplace’*
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