Using the sun to cool your indoor grow?

It seems like magic at first, but it’s actually a clever means of passively cooling a building. Essentially, the sun acts as an evaporative cooler, allowing water to passively evaporate from a film on a roof, cooling the building. Obviously, because it’s an evaporative cooler at its core, it’s less effective in humid conditions, but still, neat idea. They tested it in Las Vegas (a hot and dry place) and found that the air conditioning electrical demand for the test building decreased by 21% during that period.

Think this would be useful for you?


The same principle was used in the past to keep water cool while driving through the desert. They were used quite a lot in Australia, but I’m sure that air conditioning has made them a bit obsolete: