The number one sucker of electrical power in your kitchen is your refrigerator. The standard upright fridge is horribly inefficient – whenever you open the door, cold air rushes out and needs to be replaced. There’s a simple and cost-efficient way to change that, though. Chest freezers (the kind with a hinged door on the top) are more efficient because the cold air settles to the bottom when you open the door. It’s easy to convert a chest freezer into a standard fridge with the addition of a temperature controller that turns power on and off to the unit depending on the internal temperature of the storage area. You can cut your electric bill by as much as 90% with one of these.