A solar-powered air conditioner doesn't do one much good during a Vermont winter, but rather than cranking on the heater (or huddling under the heated Hello Kitty mat) just to heat things up in a relatively small garage, a clever DIYer set out to concoct his own solar heater using scrap parts and a bit of free time. The solar wall was primarily built with black-painted soda cans, a wooden wall, plexiglass cover, and an inlet and outlet to channel the air around. The homegrown "solar furnace" captured the sunlight beaming onto the south side of the building, and as cool air found its way into the toasty cans and rose through drilled out portals, it managed to heat up a respectable 15-degrees Fahrenheit before escaping into the garage. The creator did note that his next attempt would sport a relocated inlet and be much larger in size, but if you're interested in putting a few in-the-way parts to good use next winter, be sure to hit the read link for a pictorial how-to.
[Via HackNMod, thanks Joe]