THIS $30 SOLAR SETUP HEATS A 30 X 40 WORKSHOP FOR FIVE HOURS OR MORE EVERY SUNNY WINTER DAY

THIS $30 SOLAR SETUP HEATS A 30 X 40 WORKSHOP FOR FIVE HOURS OR MORE EVERY SUNNY WINTER DAY
"For a super-simple and super-inexpensive solar heating system that really works," say Don R. and George Waterman of Springfield, Missouri, "you only have to follow four rules. One, glaze with low-cost plastic film instead of glass or plexiglass ... two, use a structure's existing south-facing wall for the back of your collector ...

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