I purchased and am raising chickens in the Rocky Mountains. My chickens were bought mid April and so far I bought 15 and all 15 are laying. I wanted to know how warm the coop should be during our first big storm that we are having. Yesterday I opened their little hatch door, and I saw that they had come out, but it wasn't much into the 20's. Today it was blowing snow so I kept them in. My coop is 8x8 with OSB siding inside. I also am doing the Deep Liter method. In the front I have stuffed straw in between interwall and outer wall. I just haven't gotten to the back which faces the north. Should I use a heat lamp and if not now when? They are laying more and more each day. I have a mixed flock, 6 Aruacanas,2 Light Brahmas, 2 buff Orpingtons,4 New Hamshire Reds and 1 Black Australorp. It's been super fun, so I want to keep it that way. I don't want to do somehthing that would cause them to get too cold. Thanks....rEGGae chick!