Q's Daily DIY Green Tips: When Closed is Cool

Consider the opposite of frequently, and apply that definition to how often you open your refrigerator door.  Every time you open the refrigerator, cold air escapes causing the need for the unit to create replacement cold air to maintain the temperature.  To save energy, limit how often you close the refrigerator and the amount of time the door is open.  When closing the door, make sure it is closed tightly to limit escaping air.

P Quentin Unsworth