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Is it more efficient to leave the fridge briefly open when I am pouring milk for my tea or to close and reopen it, given warm air is introduced whenever the fridge door is opened?
Nick Baker
Colchester, Essex, UK
As the door opens, the cold, heavy air will flow out onto the floor, drawing in the room’s warm air from above. Within a few seconds, there will be a steady down-flowing convection current. Even quicker than that, the warm surfaces of the room will start radiating energy (in the form of infrared radiation) to the surfaces of the fridge’s…
