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Discussion Starter #1
Seen a few videos on YouTube of solar air heaters an they look really simple/cheap to make. Why aren't they common like solar Electric panels?
 

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Possibly because when there's enough sunshine to operate one, most potential customers feel they don't need a heater ?
 

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Discussion Starter #4
Seems to me they would make a good pair with PV panels on the roof. You could put these air panels on the south wall cos winter sun is lower.
 
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