Jim, when the outside temp is 95 no fan will bring it down to 80
. It has to be hotter inside then outside, no matter the air movement. I doubt if any fan can keep the temps inside at outside measurements.
I just can't understand how they have greenhouses at Selby's, for example, and have orchids growing nicely inside. I never really wondered about that until I got my own hothouse. Now I'm really curious as to how they do it. I think they have air moistening systems to keep things cool. Next time I go there, I'll do some serious investigation.
PS How is the temp difference between in and out now?