Keep the freezer closed. A closed freezer acts like an insulated ice chest. Food will usually stay frozen in a fully loaded freezer for two days if the freezer is kept closed. A freezer that is partially full will not keep more than one day.
How long the food will stay frozen depends on the amount of food in the freezer, the kind of food (a freezer full of meat or other dense foods will not warm up as fast as a freezer full of baked food), the temperature of the food when the power was interrupted, the quality of the freezer itself (a well insulated freezer with good gaskets will keep food frozen much longer than one with little insulation and poor gaskets), and the size of freezer (the larger the freezer, the longer the food will stay frozen).
Reference: When the Home Freezer Stops, Pm 1367, Iowa State University Extension
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