I have a couple of Blue Andalusians and found out that they are not cold hardy. I live in E. Tenn. and we sometimes get into the teens at night but really have very little snow. At what degree should I provide heat in the coop? Should I put it beside the roosts or below since warm air rises? Is a heat lamp OK or should I plan on something else? I know winter is a ways off but I would like to be prepared.