I live outside Madison Wisconsin, it is very cold here, we have had -18 wind chills and below zero weather. My hens are in a metal shed. I put two heat light lamps in with them. One to keep there water from freezing and the other so that they could go under it for warmth. They are not using it! Are they dumb or are they not cold? How could they not be cold! I'm cold! Sorry if this is a stuiped question, I have only had hens for 6 months. Thank-you