Put them in the bathroom, close the door and open the window?
Heh dunno, last time I was in a dorm room was Berklee College of Music in Boston and it was three to a room. Guess you could get an appropriately-sized trash can or bin and judiciously add frozen water bottles or just go swamp cooler ghetto style with the wet shirts and the fan.
Or make a box of insulated material with foam insulation and duct tape for your fermentors, and then periodically switch out frozen water bottles.
There are a lot of options, some are more of a pain in the ass and less accurate than others.
The good news is, even if you don't do any of the above you'll end up with enjoyable, drinkable beer!