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Maintaining the correct refrigerator or freezer temperature is important as it affects the food quality, food safety, energy costs, taste, appearance and nutrient content of stored food. Storing food at the correct temperature will slow down or stop the spread of harmful bacteria and extends the product shelf life.
As all food has bacteria, storing food in refrigerators will slow down bacteria growth whereas freezer will stop growth. It is important to take note that freezers do not kill bacteria as the bacteria will resume growth when the food is thawed.
Setting the correct refrigerator temperature is important as expiration dates on perishable food such as milk are based on the supposition that the food is kept at the appropriate temperature.
The freezer temperature affects more than whether it can produce ice. For each five degrees above the desired freezer temperature, the length of time the food may be stored is reduced by half.