I have a coop that I ordered and I'm learning that there are some things that need to be adjusted...specifically the ventilation. My coop is 8x4 with a people door and a window opposite each other on the short ends. There is a drop down vent that is about 3'' by 6'. The coop was adequately ventilated this summer, but I am a little worried about the winter. I don't want to leave the window cracked or the vent open because it is right at roost level. I thought about adding a cupola, but my roof line is only 8 ft long, and I cant find one small enough and I'm not handy enough to build my own. I only have a few inches of space above the window and no room over the door which i could cut out and cover with some wire...I think. Help!