I am in north/west NJ. It can get pretty cold around here. I have 25 layers, mostly RI Reds. The coop is half of a 12x24 horse barn so the chickens area is 12x12 with a 12 foot ceiling. I screwed some 8" wide plywood shelving about 4 foot off the ground which they always use. The barn has a plywood floor which is insullated underneath with TEX bubble foil. We use shavings on the floor and I clean the perching shelves every day. My question is, is there anything I have to do to keep the chickens comfortable during the winter. I was thinking of building a smaller (perhaps 4x8) raised enclosure within the 12x12 and adding a flat panel heater. But I don't know if they would use the enclosurer or not? And I'm not sure if they would need more ventalation than that. Can anyone advise me as to the best way to keep them comfortable during the cold months? Would just adding bales of hay or (maybe it should be straw) in the 12x12 help and forget about the smaller enclosure? Would more shavings on he floor help? etc. Thank you.