Box Fans?

Currently my setup is running around 86 degrees with lights on I have one box fan that is blowing hot air out of the room. AC is usually on to keep temps in check but i was curious if it would benefit anything if I stacked another box fan on top of the other so there was one blowing cool air in and hot air out. I already have the fans but just thought it might help, it is probably about to start getting hotter down here so anything to save on electricity.

better to have 2 box fans on the extract ..leave the inlet passive, even better to rig up the extra fan to a temp. controller like the Chinese Whilly, cheap and efficient, or both to a speed controller

Thanks for the tip the temps went from 86 to 81

If you have ac and its not able to keep room cool your notndoing something right. Also why would you use box fans to suck out the air conditioned air that makes no sense. Sounds to me just.make it a vemted room. in summer time yo will not be able to grow at all due to heat