i already have 2 basement type windows(32x17 each) on the 2 front doors(its a barn style coop)..i have 2 very small gable vents on the back wall(on the bottom)..where the perch is going to be, and i was going to add another window on the side of the coop(for cross ventilation)..but my concern is the window on the side wall will have to be across form my nest boxes...will they get a draft?...also....how much do i open the windows at night?...i want them to have ventilation, but not drafts. thanks,Wendy