Your refrigerator will work more efficiently and last longer if you keep it at the right temperature. If you think colder is better, you’re wrong! It makes the motor work harder, wastes energy, and can spoil some foods such as tomatoes and fruit. According to the U.S. Department of Energy the ideal temperature should be between 35° F and 38° F. Next thing to do is to check the seals around the doors. Slide a dollar bill in letting half stick out when you close the door. If you can pull it out easily you should replace the seals.