Hello! New to the forum and having a lot of problems trying to figure out the right way to ventilate a coop during the winter. I have a small flock in my coop which has 2 functioning windows, but no vents or fans in it. I live in northern Wisconsin and I understand there is a need to prevent frostbite here, but need to understand what I need to have or install to achieve this. I seem to have been receiving a lot of contrardictory recommendations. Thank you!!