I lived in an old house in Cincinnati years ago that had a galvanized box built into the kitchen wall under the window where you could keep food cold in the winter months. It was basically a box hanging outside the house with sliding door access from inside. Perhaps you guys in cold climates could include one of these in your remodeling plans.
If my house had one of those, it would've got torn off, insulated and dry-walled in the remodeling plans. I don't like drafts.
However, I do have an unconditioned (in the winter) room in the basement that keeps all my wine and beer at steady cellar temps. Summer time requires an A/C. But for the wine, I could ventilate it to outside air and have a freeze-ass walk-in lagering chamber. I did that one year. It was a steady 40 degrees in there. However, it being below the kitchen caused the floor to be cold.