Great looking bunch o' ladies you've got there, HH!
I run 2 exhaust fans- I manage to keep the box at 1 degree above room temp with them both on, during the cooler weather I only run 1 of them...
But I've got the same problem that you have- No a/c in the house, so if the room is 90 degrees (like right now)
The box runs at 91.
About all I can do is keep the plants hydrated and hope for the best. (so far,so good)
Of course, this doesn't really help you at all...but at least you know you're not alone with
the heat problems