Take empty 2 liter soda bottles and freeze them. Put them behind the fan and turn it on. This should help draw some cool air around the room. Not sure how much itll do though.

Also i the ambient temps in the room are 85+ you might wanna just shut the heat off to your rack. It was 88degrees in my room at thr begining of the summer before i put my AC in and i just shut off the heat in my rack for 3-4days straight. My snakes were much more content.