Hi All! Having some frustration with figuring out ventilation in these temps here in northern Wisconsin. Lows in -20 (not including windchill) and staying that way. I hear not to put water inside.. but water freezes outdoor in an hour and chickens aren't interested in going outside anymore. Would a fan in the coop help? Opening the windows would create huge drafts based on placement and other recommendations haven't panned out. Would it make sense to create holes in the roof now in these temps? My poor rooster has started to get frostbite and trying to remedy the situation ASAP. Please help! Thank you!