How about a simple experiment like

LEAVE THE DOOR ON THE CLOSET open and see what happens. Crap, all this spendy stuff????

The temp of the roots is what is important, if you are going to cool anything, cool them to the mid 60-70 range.

The air flow is necessary to remove humidity, oxygen, and heat. You get better of both if you can leave that door open an inch or so, you will have to experiment to find out how much.