Keeping your refrigerator at 42 degrees Fahrenheit will help keep your food cold and help keep your energy bills down. The drawback is that if you have a lot of food in your refrigerator, it may not be cold enough to keep your food fresh. If you are unsure of what temperature is best for your refrigerator. Then it is a good idea to experiment with different settings to see what works best for you. Remember that the colder the fridge is, the more electricity it will use.