We do not have coyotes or bears here. :p
My coop is within my yard that has 6' fencing. We do have raccoons and red fox here. So far no one has gotten through the 1/4" hardware cloth on my windows. I do know that raccoons have been near, on and exploring the coop exterior over the years. If they...
I leave all 11 windows open on my big coop open from April to October. Only 4 are under the run roof.
My small coop only has 3 windows. They stay open too.