I have a 4x7 chicken coop. This is my first year having chickens. How do I keep the coop from over heating? I have vents but it is turning into a sauna. It is a 102 degrees outside and about 90 degrees in the coop. Dont know what to do. I tried an exhaust fan and it doesn’t seem to be doing much. They have a covered run and are outside during the day.