I tried a regular a/c in the green house it didn't cool the gh enough to not worry about it getting too hot if I was gone .
Then got a high pressure pump fed with rain water and hooked it to a mist fan works well but uses to much rain water .It just runs the over head mist tubes now .
Back to the under bench misters hooked to regular water it is ok as long as it does not mist the plants, to much lime, turns them white .At the other house had a large evaporative cooler thru the wall , to much humidity on the river Next greenhouse will have a cool cell wall no room in the one I have now .. Gin