Simple, recycled, nearly zero-cost. Yet amazingly effective at capturing passive solar heat.
Window frame, aluminum cans painted black, stacked like an array of chimneys. Convection pulls cool air in from below and ejects lots of hot air from the top. The author says 105 degrees, in fact, without having the prototype properly insulated or sealed. YIKES!
http://ecotechdaily.com/2009/07/01/free-heat-from-an-old-window-and-some-soda-cans/
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