This concept looks VERY intriguing to me, but rather than all those steps to convert the cardboard box, I will keep my eyes peeled while dumpster diving for pre-existing box-like structures that I can simply make black inside then afix a pane of scrounged glass or plexi-glass to trap the heat. Several of these would have been great in my Denver days, but even here in Tampa we get 30s, even 20s each winter, with some days topping out in the 50s, so one for each of my south side windows might do a lot to keep my home cozy....for free. Enjoy this great video. John
http://www.youtube.com/watch?v=zT1qO9OE9tc&feature=related
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