I have a rather large coop, just screened it with hardware fabric to keep out the baddies. My problem is that yesterday 7 hens died because it got hot and they couldn't get into my garden and root around in the dirt I'm guessing. The coop is in shade 100% of the day, there was water but they still died all the same. How would you keep a good breeze of cooling system in place? It has to be passive or reactive because I'm gone during the day.