With windows closed how much ventilation do you have? You still need to have around 1 sq ft (or more) per bird open even in winter.Have plenty of windows in coop should I plastic some to keep drafts out if there are any? Only leave one or two. Close windows on cold nights? Wrap run? I’m in NJ (south) so it’s usually mild like 35-45 in winters but they say we may have more snow this year?
Your temperatures are milder than mine. I do not wrap nor cover my run nor do I close windows, unless there's a sideways wind blowing straight into the windows (which is rare). I have additional ventilation even with windows closed. If you get frequent windstorms, then wind protecting the run against predominant winds might be a good idea, but snow can also be dealt with by just shoveling it.