![]() ![]() I have a basement that is hard to keep warm. ![]() I plan to put a little solar powered fan on mine to get even more volume of air. We have been told that if you add bottles of anti-freeze, or rocks, in the unit (would take a larger, deeper unit) that the heat will keep on for about 6 hours after the sun goes down. We tested it several times and even when few clouds passed by, managed a 40 to 60 degree spread. To our amazement, after only 10 minutes in the sun, the box was throwing out a breeze of hot air (130 to 140 degrees F) while the temperature outside was 78 degrees. We cut a hole in the bottom of the back wall and a hole in the top, and sealed it all tight with silicone. ![]() When the sunlight came through the polycarbonate, it hit the "black" screen wire, and some of the light hit the aluminum foil and that reflected back creating more heat. Using old 2 x 4's, some polycarbonate panels we had in storage, we built a box, spray painted screen wire black, tacked aluminum foil on the back wall of the box. We decided to build one, 4.5' by 6.5' to check it out. The EPA, and Mother Earth, have expressed interest in "Passive Solar Heat Box" units for home and commercial building heating. ![]()
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