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Here is a schematic of a solar air heater I have been inventing in my head. I hope to build one before next winter. The glass in the front facing the winter Sun will heat the black powder coated perforated Aluminium in the same way a solar water heater works. The air would be drawn through the perforations and be ducted inside the house by a low wattage fan. My calculations suggest that even with an outside temperature at 5 deg C say the house can be heated to 18 deg C +. Each square meter of this type of panel would produce a bit better than the equivalent of one KW of heat as warm air.
I thought I would throw this in for comment.
Bert
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