Depends a lot on humidity. Condensing a fridge full of humid air releases a fair bit of heat. Also a fuller fridge will have much more thermal mass and care le

Depends a lot on humidity. Condensing a fridge full of humid air releases a fair bit of heat. Also a fuller fridge will have much more thermal mass and care less. But yes, exchanging the entire air volume of a fridge every time you open it is very energy-wasteful.