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ppart/iStock/Getty Images. The refrigerator is one of the most vital appliances in your kitchen because it keeps your food fresh. Unfortunately, most refrigerators don't last forever; you can expect one to function properly for an average of 13 years, according to the National Association of Home Builders.
The refrigerator will keep food safely cold for about 4 hours if it is unopened. A full freezer will hold the temperature for approximately 48 hours (24 hours if it is half full) if the door remains closed. Obtain dry or block ice to keep your refrigerator as cold as possible if the power is going to be out for a prolonged period of time.