Before the Refrigerator, There was the Root Cellar. Here's How to Build One! Stores: Jams, Salted Meat, Bread, Butter, Cheese, Milk and Cream, Apples, Potatoes, Carrots, Plums, Pears, Peaches, Tomatoes, Cabbage, Wine, Beer, Cider, Grains, Nuts, Dried food, Canned Food and MORE!
Wow, great idea, and the manufacturer actually explains it for DIY-ers! It doesn't really heat a whole house, but for a small hut, it could work on cold spring/fall evenings when you don't want to start the wood stove.