At six weeks they should be fully feathered and OK without extra heat.Great Thread! I am sick of having the chicks, that are six weeks old, in the house! Coop is not ready yet- next week is the goal. It's supposed to be in the 40's tonight and I really want the brooder out of my office and on the screen porch. I was nervous about the low temps but from what I hear from all of you, they should be fine with a heat lamp. Yay!