I live in Florida and the temperatures have been in the low 80s to low 90s lately. My chicken coop has a metal roof, one doorway (facing south) that is completely open with screen on it for a breeze, and a screen door (facing east). I have a fan that I run next to the screen doorway (the door on the south side) to pull in cooler air from the outside. Somehow my coop just doesn't stay cool enough. It gets up to 99 degrees some days. I always keep plenty of water for the chickens and have been letting them free-range more during the day to find cooler shady spots...but this scares me because of the numerous hawks we have. We are planning on cutting another doorway into the coop tonight (on the north side of the coop) and putting screen up on it to help with circulation. We'll put another fan in that doorway since it sits under a pinetree and might pull in some cooler air. I plan to eventually put a screen aviary off of the coop, but that's more than an evening project. Right now I have two younger hens that I am having to put them in a wire cage outside during the day with a fan (and of course their food and water) to keep them from overheating. The coop doesn't get a whole lot of shade in the morning until 3pm. Unfortnately, we took an existing metal barn and converted it to a chicken coop, so we can't move it to a shadier spot. That would be too easy. To make a long stroy short...What is the highest known temperature that chickens can tolerate? And does anyone have any inexpensive and easy ways to cool a coop (placement of fans in a certain area, foam insulation in ceiling, etc.)?