I have 3 chicks, a 5 week old roo, and two 4 week old girls. For our heating method we use a heat lamp. The roo is very hot under the heat lamp but the others aren't ( the lamp is 40" away from ground). Any ideas on how to keep the girls warm without him over heating? Could we put him outside even though it is winter? When would be a good time to start taking them outside?