Steps to Reduce Your Refrigerator's Energy Cost
From Jeffrey Orloff, former About.com Guide
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Setting the Right Temperature
Refrigerators and freezers should not be set too cold. Refrigerators should maintain a temperature of 37 to 40 degrees farenheit. Freezers should be at 5 degrees farenheit. Stand alone freezers for long storage can be set at 0 degrees farenheit.
To check your refrigerator's temperature, set a thermometor in a glass of water in the center of the appliance. Read the thermometor after 24 hours. For a freezer, place a thermometer inbetween packages. Again, read the thermometor after 24 hours.