Energy conservation fact sheets often suggest replacing appliances with more efficient models to reduce energy usage, but some can't afford a new appliance. There are still ways to save energy using existing appliances, especially the refrigerator.
Mr. Electricity estimates the refrigerator accounts for 14 percent of home energy usage, second only to an air conditioner. Unfortunately, for most homes, a refrigerator is a necessity while an air conditioner may be an unneeded luxury. Mr. Electricity also has additional and different tips here for reducing energy usage in the refrigerator.
Picture Credit: Refrigerator: http://www.flickr.com/photos/susansimon/2626829710/