The chicks will be 5 weeks old this Thursday. They are currently still in their brooder in the house, but without the heat lamp. They are pretty well feathered out by now, just a little chick fluff left. There are 23 of them, 10 bantams and 13 standard sized breeds. Temps during the day for the next week range between 65*F.-80*F., with night temps down to 47*F. tonight, but warming up into the 50's and 60's at night from there. Will they be ok outside (in the coop) without a heat lamp?