"The Los Angeles County Arboretum has a high pressure fogger like this in their begonia (and Nepenthes) glasshouse. It produces an extremely fine fog that hangs in the air for minutes. Still, I concur with you observation that if it is operated for the lengths of time required for cooling, several hours continuous, that the plants will get wet but there will also be at least 18 hours in every 24 hour cycle that does not require use of the foggers for cooling where the plants can dry."
Go for it. I don't have sufficient information about your plan to comment any further. I visualize the LA County Arboretum that you mention above to be a very tall, high volume structure like others I have seen. I don't know that as I've never been there, but if you are comparing a 30 or 40 foot tall structure to a 10 ft wide GH with a peak of maybe 12 ft I think you are comparing apples with peanuts...but I have no idea what the LA structure or its system is like so I should shut the heck up.
I also don't understand your statement that the system will be only be required 6 hours every 24 for cooling. The only thing I know for sure about your climate is that its much different than mine. I frequently have to cool 24 hr. a day for days on end. It seems to me that you are saying that you plan to use temperature control on the fogger (not humidity control). So a lot of the wet foliage result will be dependent on how fast the foliage drys after the system shuts down. What I can say with some reasonable confidence is that if the foliage stays wet for periods of 6-8 hours, especially if it's frequently, you will have fungus issues. The problem with fungues is that the more you get, the more you get because they are sitting there spewing spores whenever the conditions are right (usually wet and cool).
Once again, I don't know enough about your system and environment to really be commenting. I'm just offering you some cautions that apply generally to greenhouses for your consideration.
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