Risk of damage from short-term exposure to extreme heat.

[Ray]

Don't underestimate the efficacy of evaporative cooling. It "works" at anything under 100% RH, but the lower the humidity of the incoming air, the more effective it will be.

Being as you're in NY, I am reasonably confident your ambient RH is not too high. They are supposed to draw outside air in, which is cooled and blown into the greenhouse, but I have seen one in operation inside of a hot, humid greenhouse in Houston, and was stunned when I felt the cooling effect in its fan blast.