I have heard so much about the need for ventilation. I know I have that but I think it borders on drafty. This is a real newbie question but what is the difference? My coop is insulated but the entire ridge of the roof has a cap with openings (pole barn construction). Also there is a 2-3 inch opening along both eaves the full length of the coop. I was told this summer I have good ventilation, but now that it is 31 degrees and windy (Northern Michigan weather) I think it is drafty. I would like a good balance but I have never heard a concrete answer.