Most obvious place to add ventilation is high up on the wall facing into the run as the roof will help provide climate protection. Make it big enough to let natural light into the coop, as chickens will have difficulty navigating if they can't see (which may cause them to not want to go into the coop at dusk). For cross flow you can add a louvered vent on the opposite side.Thank you for the info! I can definitely add an opening. The vent hole with a fan is on the backside of this picture and the wind blows towards the coop from where the picture is taken. The picture doesn’t have the ramp and obviously can’t see the auto door. Small door is for nesting boxes and large opening is for cleanout/accessView attachment 4123738