For a Woods Coop the front windows are always open -- the coop should be oriented so that side faces away from the prevailing winds. The clerestory windows are closed in winter.
Summer airflow:
Winter airflow:
1. The Usual Guidelines
For each adult, standard-sized hen you need:
4 square feet in the coop (.37 square meters)
10 square feet in the run (.93 square meters),
1 linear foot of roost (.3 meters),
1/4 of a nest box,
And 1 square foot (.09 square meters) of permanent, 24/7/365 ventilation...