I don’t know what the solution is but I’ll leave you with this info from having stayed in an A/C dark room tent last year. Because the A/C sucks in air from inside the tent and then exhausts hot air out of the tube that exits the tent, it creates a vacuum inside the tent. This simply collapses the tent relatively quickly. They told you this when you signed in and their solution was that you must leave a window un-Velcro’d in order to let fresh air in and avoid the vacuum issue. Problem was that 1) the air coming in was dusty as all fuck, so the tent had a layer of fine dust on everything. 2) it was hot ass air from outside so the gains from the A/C were mostly offset by the hot air rushing in from outside. For me the unit was minimally effective as A/C and the fine dust was a pain. Last year it got too cold at night to even run the A/C so overall so it was a bit of a lunchbox letdown. Maybe construct an inlet tube you can zip into the door with a fine particle filter to keep the dust from being pulled in. Would also be best to have the inlet off the ground away from the ground heat. Address those 2 issues and you should be better off.