PHThe fuller the fridge, the more energy efficient it is
An empty fridge not only makes it more difficult to decide what to snack on, but it also wastes valuable energy. It works like this: The more empty space in the fridge, the more cold air is displaced by warm air when you open the door, requiring the appliance to generate cool air to replace it. If the fridge is packed, less cool air escapes and less energy is required to replenish it.
(S) bestlifeonline