MissE
Crowing
Ok. General rule is one square foot of permanent ventilation per bird, even in the winter. I made the mistake of insulating mine, thinking at -40f they would need it. In reality, the insulation was wasted because they needed dry air more than warm air. You don't want them to trap their body heat in the coop because that also means moisture is trapped with them.There are two vents at the north south roof, three windows, a half screen door and the chicken door. I’ll do a test this winter, if it needs any additional, I’ll install some sort of small automatic venting fan..