Hello Our first foray into chickens.. we picked up 6 Black Australops last week. They are now 2 weeks old, I suspect a few are older as they are much taller and have more feathers.. They have been living in our den in a guinea pig cage with a heat lamp. They are really running around their little pen.. Our coop arrived today, an Amish barn, 8x8. At what point can they go out into their coop, but not be outside to run free.. just in their coop.. with their heat lamp etc? We live in NY, about 1/2 way between Albany and NYC. Nights here are around 40 degrees F at this point.. Thanks!!!