Right now our chicks are in the old coop, in which the only ventilation is the windows on either end. We are building a new coop which will have vents up high for winter and windows all around for summer. What temp do I need to watch for to close the windows? I am concerned about them not getting enough ventilation if I close them so I want to wait until it's absolutely necessary. I'm really hoping our new coop is ready soon but it's slow going. DH is getting ready for harvest so he only has time to work on it for a couple of hours a day. The chicks are 17 weeks old and right now, in a coop that is about 4 x 6.