So the cold air spills out when you open it. However the thermal mass of the air inside the fridge can’t be much compared to the thermal mass of the contents of

So the cold air spills out when you open it. However the thermal mass of the air inside the fridge can’t be much compared to the thermal mass of the contents of a normal fridge. And of course the more full your fridge, the less cold air there actually is in there to lose anyway. No doubt that a chest fridge would be more efficient on paper, but it’s far more inconvenient for everyday use. I would question if the efficiency gains are lost by all the time you’d spend with it open digging around for stuff.