Mark, my greenhouse would always be about 95-F to 110-F on sunny summer days. I would hose down the floor, and spray water from the hose in the air and on the trees in an effort to cool the greenhouse down some. After I installed a Wet Wall cooler system it stays at 83-F even on the hottest days.
Nice! Yeah, would love a wet wall but I need access for the hundreds of pollinators. How do you give them access? I've got quite a few top notch bearing avocado, mango, citrus trees and soon El Bumpo cherimoya. Also pineapples etc. and come spring I have hundreds of every kind of flies, wasp, bee, moth, butterfly doing their biz.
My well water is rock hard, like a TDS of 800+ so a wet wall is out of the question. Saw one locally but he's feeding his pads with rain water. Am thinking about installing a high pressure flash nozzle system. The two Aussie Bonaire swamp coolers suck - not enough pad area and a REAL pita to maintain because of my high bicarbs water.
I too cool down the house/trees by giving them a shower with rainwater and hosing down the walls and benches with well water.