New to the site and figured this would be the place to bounce ideas off of. I have looked around and have not found any thing on this idea of heating a greenhouse. I know the use of thermal mass 55 gallon water barrels is not new but what about super heating the barrels with pass through air style solar collectors the ones using window screen. My thought was to build a plenum behind a barrel wall on the north side of the greenhouse and pump the hot air generated by the solar collectors into it and back to the collector.
