When I was a kid, my mom told a story on herself. As a young women her refrigerator did not work so she called a repairman. He came over and vacuumed the back side of her refrigerator. She said she was embarrassed, but it did fix her refrigerator.
A refrigerator uses about 15 % of your household electricity.
A couple years ago I went to the Green Energy Fair in Duluth and I listened to a talk by Tony Mancuso. (He figures out lots of innovative ways to save energy for St. Louis County.) He also talked about how you could increase the efficiency of your refrigerator if you clean behind it, and he had some examples of brushes you could use. So, I purchased this nifty brush that Prof. Cricket is posing by, but I never used it.
About a month ago our refrigerator started making all kinds of funny noises. It was very loud. So I spent a good hour using the brush behind the coils and especially the areas close to the floor and near the fan.
Now our refrigerator isn't making any more funny noises and it is quiet.
Here is a link on how to clean the coils for your refrigerator
http://www.ehow.com/how_2026039_save-energy-fridge.html
This above example talks about removing a plate. I did not do that.
Here is another blog, Brave New Leaf, with a post about how to clean the coils:
http://www.bravenewleaf.com/environment/2008/03/scary-and-new-c.html