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Nov 28, 2020 at 3:44 comment added csk Evaporative cooling is an extremely simple concept that can be achieved with simple homemade methods. There's no need to invest in an expensive industrial swamp cooler. If you google "DIY greenhouse swamp cooler" you can find instructions.
Nov 27, 2020 at 20:26 history answered Christmas Snow CC BY-SA 4.0