Hi everyone! I first want to say this forum has been most helpfull! we are new to chickens and we didn't realize how much we didn't know! I live in the Northwest, and am not sure about winter. I know chickens are pretty hardy (at least the ones I got) in winter. There really is only a few weeks total that it gets below freezing in the winter. Anyway, I was wondering if I had enough ventilation for the winter time. We will have 2 opening windows for summer time. We put a total of about 18 1" holes in the bird blocking that will have screening over them. Is this going to be enough for winter when they are all closed up? Thanks! I will post some pics as soon as I figure out how!