Learn how to build a solar furnace and if you have enough sun in your area this could be a perfect off grid heating solution. Made from re-purposed and or salvaged materials you can build it for very little money. If you watch the video provided it will let you see the furnace being built from start to finish. The heat is put in through a pipe and cooler air is taken out to be heated through valves that go through a board that has been inserted in a window.
