I think this is a really cool project, but I'm not sure how well it would work in the winter around here. I think I would be more inclined to make this is if it didn't block light from coming in through a window and if it were more... attractive. The blockage of sunlight is a big concern here since living in an apartment often means that you probably don't get a whole lot of windows with lots of sun to begin with. Still, a passive heater that can lower your heating bills for free can be an attractive thing.
http://www.squidoo.com/beercansolarheater
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