DIY Solar Heater

Check this video I found on Lifehacker that explains how to build a cheap solar heater! Shouldn't cost me more than $20, and may end up saving me as much in one monthly energy bill. The time to build and the cost of materials may potentially count as an energy-efficient tax deductable.

I'm not sure how effective this would be in Seattle, but my guess is that any light (even filtered through clouds) would generate some heat. My new place cools down so quickly that I think this'll be be my next project!