I live in northern Wisconsin…right on Lake Superior. We get very cold weather here, and last night it was down to 6 degrees. I decided to leave a red heat lamp on all night for the hens, as they seemed to be cold. The coop is built well and has 6 inches of pine shavings on the floor. The chickens can come out into a run during the day that we put hockey glass around to cut down on the wind….that's right up here it's plexi glass ….the hens seem to do well with this. I am wondering if it is overkill to have the heat lamp? Is there a magic temp to shoot for, or is it personal choice? Some of the hens are only 5 months old, and the rest are about 8 months old. I just don't want them to get chilled. I don't see any evidence of bullying Any tips for this super cold climate? I have noticed that some of the hens don't want to lay in the nesting boxes anymore, and have been laying in the coop on the floor…. stinkers!!