Loved this article! This is my first winter with chickens in New England and I've been doing my best to make sure my Rhode Island Reds are comfortable. I have a large coop and am totally against having any electricity near my chickens. I insulated the coop walls and created a drop ceiling below the vents. I did leave gaps for air circulation. This article made me feel less crazy about doing this. Thank you. We've already had a little taste of mild winter temps with frost every morning for the past two weeks and daytime temps in high 30's to low 40's. The gang was out their in the run acting normal, even during the Nor'easter we just had. The insulated coop has not dropped below 35 degrees at night, it's usually between 40 and 45 degrees. So I'm guessing once the real winter temps settle in I'll be hanging heavy duty clear vinyl sheets on their run to keep it warm. (quick note: their run is covered with corrugated metal roofing)