I feel like we've been living in a rain forest this summer. I've never seen such humidity. It's gross. Everything feels wet. The biting insects LOVE it. I hate it. I rehomed all my roosters about 2 weeks ago, cutting my number of chickens by half (7 standards and 1 bantam). We emptied the coop, vacuumed it, washed it, washed the floor, the walls, the nest boxes, the window... then filled it with fresh wood chips and set it all back up. Tonight I went in to tuck them in for the night and saw MOLD!!!! Mold is growing on the walls! The coop is 6x8 feet, with an open screened window, an open hatch, and an exhaust fan (bathroom fan) that is running 24-7. It is fully insulated with vapour barrier and wood paneling on the inside walls. The chips aren't wet, they haven't spilled their water. It's even growing in corners where there is no food or water kept. I would be really surprised if ventilation is the problem... I'm going to have to clean it out tomorrow. Has anyone dealt with this sort of thing? What did you do? What works and what doesn't? I could plug the heat lamp back in to dry things out maybe but that's going to be warm in there. Any thoughts appreciated.