Thank you Paulajon!! I appreciate your info! That's my thought too so I've kept the pop door closed the past 2 days. My coop is 8x12 (chicken area is about 8x8) with gable vents at both ends. My nesting boxes are about 18 inches up one wall. I've placed a cardboard box--on it's side--under the boxes to block wind from the popdoor. I've also layered this area with hay so they can huddled in that. I'm doing DLM but I think it's too dry to give off any real heat. Surprisingly my silkie & sizzles were the ones that loved to be out in the pen. I have a heat lamp w/dome. I also had a 100 watt bulb in the chicken area & in the storage area but DH changed them to twirly energy saving ones. And while I do love him, he is so tight he squeaks. His concern is how much the heat lamps & coop lights affect the electric bill. Do you see a big increase?