Hello everyone, this will be the first winter with my flock. I have been reading a lot about ventilation during the winter but I'm still confused. I have 4 hens and a relatively small coop. (They have a 22' x 22' run) I have been closing the popdoor at night lately as it is getting cold here in nj. Want to know if I'm doing more good than harm. Should I vent more or insulate more? I have attached a pic of my setup. Any recommedations would be appreciated.