From reading the article (and thank you for posting the article), both systems, fan and wet pad, and fan and fogging work best in hot dry locations such as Arizona, as it is written in the article -- " The high-pressure fog works best in a dry climate, he says. If the outside air is humid and hot, the cooling capacity of an evaporative cooling system is very limited to just a couple of degrees Celsius." What about a humid area such as Brian's ? Here in Colorado, the area is a dry area, and evaporative cooling works really great, and I assume fogging would also. I use what is called a wet wall evaporative system, which works wonders during the summer months. Brain, does your greenhouse have roof vents?