I have read a lot of posts here about the cold snap, some with very cold temps don't do much others do. As a rule, if there is one. What is a reasonable temperature for the chickens, to let out. If its about 15 degrees, and protected from the wind? Is there some ball park figures so I know I am being kind to them? I have an insulated chicken house 22 hens. The water has frozen in the coop, but I doubt it gets below 20 in there. We are getting around 5 above or so here tonight. I wonder should I put a light in there with them, and or, keep them in for the day to help heat the house? thanks.