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We built a Heat Grabber several years ago and built it cheaply. It actually worked pretty well to keep the temp in the garage above freezing. Had we used more durable materials, I suspect it would have lasted a lot longer than just 4 years in our Midwestern climate.
I would consider filling the space with used door sized glass windows recovered from house renovations. All the light collected would heat the inside of the garage. The amount collected can be controlled by outside shading. You could install a dense wall inside the glass to store the heat for nighttime reradiating. Collecting solar heat is the easiest and most sensible use of solar energy.
FWIW - My condo has a "collector are consisting of 6' h x 12' long sliding glass doors. These are shaded in the summer with drop down white shades. They are closed off on winter nights with heavy insulted drapes on the inside. The result is we have only had to heat the main living space with a 1500 watt portable heater. We have not used the existing electric baseboard heat for over 30 years. We live in southern New Hampshire.
With the cans it sounds like a Red Green sort of project
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