Refrigerator using cold outdoor air?

The idea is sound however the costs involved in designing building and mass production is too high. Plus this system has way to many moving parts. The extra costs and the fact they would not last as long as a normal fridge gives the end user no savings.

I don't think it would work, unless it was in an unheated outbuilding or somehow had a vent to the open air.

The idea of opening a door to the outside world in freezing weather conditions is not really feasible, you'd have to reheat the room each time you opened a fridge door.

The air also would have to be heated or cooled in order to maintain an even temperature.

You could conceivably locate a ventilated locker outside as a deep freeze during your cold spell, that would work, but would it be cold enough?

Yes, but you don't win overall. In a climate that cold some of your inside warmth comes from the fridge pumping heat out. If you refrigerated using outside air, you would have to add heat from somewhere else to make up for that.

i dont no