Okay here's some factors I live in Montana and it can get pretty cold during the winter time. I live in the mountains, it can get -22 below sometimes and we can get 4 feet of snow. I was wondering could I let me silkies outside they are 3 months old now. Would a heat lamp work just fine. I have a dog house that's next to the big coop. Was wondering what about my other bantams too.. Should I keep all these guys inside for the winter ??