Linda - love your coop! Teach1 - I have one roost that is four feet and another that is three feet. I have six five-week-old chicks and was wondering, too, about the space. It'll be cozy, but it might also make it warmer from their body heat. Will definitely need to close up the windows with plexiglass or something solid like that. The roof line has small place that serves as ventilation and is also protected from the elements. I think the ventiliation is fine - it's the drafts from the windows that would be problematic, I think. Thanks so much for the feedback, I really appreciate it!