Well it's only open air on one side which is facing south for the summer breeze, but I'm planning on adding another section to the open side in the future to give them more room, but I was planning on leaving it open on that side. My other knotheads that free range won't even entertain the idea of sleep under cover or in a nice coop so I figured since 11 months out of the year it's hot I thought I would leave it open. I can always put plastic up if I think it's gonna get to cold! Oh and my dad told me today he should finish my nest boxes for the new coop! But I will say I'll believe it when I see em! I hope he does build them though!