I've seen a DIY solar heater project before and this is the latest one I've come across. To be honest, I'm not sure how effective this would be in the winter, especially if you live in an apartment in the city. Still, it's a wonderful project to try out in your free time!
http://ecotechdaily.com/2009/07/01/free-heat-from-an-old-window-and-some-soda-cans/
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