I have a coop that isn't insulated but is completely enclosed- just a small door for them to come in and out of. The coop is located between a row of pine trees, so it's pretty well blocked from wind. Heat lamps are NOT an option. I keep fresh straw in the coop and they have constant water and food. I had one hen die yesterday and two again today. I found them outside of the coop laying in the snow. Any other tips? Am I forgetting something? It has been freezing here in Minnesota. Negative wind chill. I'd hate to lose any more! I feel terrible.