We actually had the entire side of the coop open. The doors are five feet wide. We have that covered with chicken wire that can be moved for us to do what we need to. We have electrolytes in the water. We don’t have the run completed, so the coop floor is wood (no dirt). We brought them back inside that day. So, as long as we provide plenty of cool water with electrolytes, ice, open doors, and maybe a bin with dust bath, they may be fine? It’s ok if they’re panting? Or maybe I should wait until they can access the dirt ground, where it may be cooler?