My barn is about 12 x 12, I think and it just has one big front door and vents along two of the side (the walls don't meet the roof). It gets quite hot in there so part of my improvements consisted of me cutting a "window" in the back wall. I made it a couple of feet wide and about 1 1/2 foot high and covered it securely with hardware cloth. It's up high so I don't think anything can reach it anyway. I did hang a box fan in there but have it blowing inward, so will turn it around tonight.
I also cut a small chicken door in one side and moved an old dog pen down and attached it so the hens can go from inside the barn to the little dog pen run. It's making my life a lot easier.
So after reading this, I'm wondering - should make another "window" on the remaining solid wall? It really does get hot in there.
thanks,
Phyllis