http://www.wimp.com/interestingsolution/
http://blog.makezine.com/archive/2010/06/soda_can_solar_heater.html
http://www.thegoodhuman.com/2009/06/09/solar-space-heater-made-from-soda-cans-an-old-window/
Doesn't look too hard to build. Might be a great addition to a tiny house... or too hot. Not sure which.
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