Heat and wet towel in fan ?

Portable air conditioner or cooler fill with ice and water and put in front of fan

Hot Temps that's impossible to control... .... 1) air flows the most Important thing make sure the air flow is at its best it can be 2)make sure your feeding soon as the lights go off this help the food stay in the soil. Coco what ever for the most amount off time possible. 3) make sure u have a decent out take sucking all the hot shit air....

evaporative coolers -- same concept -- don't work so well, but techinically will absorb heat from the environemnt when water evaporates over time. increase surface area as much as you can and it will improve what it does. if you need more than a couple degrees cooler, this won't do much to put it in proper perspective. Condensing air works too, like with a fan and forcing it through a smaller opening. As with evaporative cooling, this will not have a big enough impact for the effort in all likelyhood.

Pump air from a portable ac into the bottom of the tent, have an extraction fan at the top of tent