Montana winters are multiple feet of snow and negative 20s and worse most nights and many daysmy birds cant keep warm in tall large coops. That’s a reflection of my climate. humidity is not the issue in winter, and is easily remedied in summer. they said Iowa winters were brutal, if that means they are like my winters then thats how we deal with them. warm coops keep them alive. and during summer when heat is the issue we open the coops up so their is ventilation and the coops can cool off. i don’t know what your winters are like, I don’t know how you keep your birds warm, this is how we do it. And it’s worked for at least 10 years so I’m sticking to it.