My 6 chicks are two weeks old today and are moving from the house to the garage in their plastic tub brooder. We've had the heat lamp on them continuously, but I have provided a bit of "shade" with a tea towel so the light isn't so bright all the time. Our coop and run is all set to go when they are ready to move in, but I am assuming they need to stay in the brooder for another week or so? Is 3 weeks of age too early to move to the coop? It's a small coop (the Chick-n-Barn by Ware). How do you transition from a constant heat lamp to no light at night? Or do you need to keep a light on in the coop? I'm not comfortable putting a heat lamp the coop. We are in N. Idaho and the temps are in the 50's overnight. Thanks for your insight!