1. If you want to save money on your electricity bill, a smart thing to do is to conserver energy. Keep your coils on the back of your refrigerator clean will make your fridge energy efficient.

2. Buy a refrigerator that has the Energy Star certificate, this will definitely save you money on electricity.

3. Do you have 2 fridges in your home because you have lots of food to store, consider purchasing a newer, larger fridge to store all your food in one place. This will once again save you money on your monthly electrical bill.

4. If you’re shopping around for a new fridge consider buying an manual defrost model, they use 33% less engery than automatic defrost versions.

4. Another energy conservation tip is to, keep the refrigerator temperature between 36-38° F, you don’t need it any colder than that. The colder it is, the more electricity it takes to run it.

5. Don’t stuff your fridge, for the most efficient results, fridges work best when not jam packed with food.

6. Don’t put your fridge in direct sunlight or sources of heat if possible.

source: http://www.refrigerators-reviews.com/18-useful-refrigerator-tips.html