Know the contents of your fridge.
Unless you live in an igloo, the temperature of your fridge is much cooler than the temperature of your home. Knowing what is inside reduces the amount of time you stand there with the door open letting all the cold air out and the warm air in, as you peruse your supply. If you think the waste of an open refrigerator is negligible, try keeping it closed more often and you might see a savings of $30-$60 a year in electricity usage! Here’s a tip to help you out. Keep a list of your fridge’s contents on the door, and cross off items after you remove them. That way you can peruse your food without opening the door (opening the door only once you know exactly what you’re after), and you’ll have a ready made grocery list (just purchase the crossed out items!).