Is the only 'requirement' is that they are feathered out? I have 15 chicks in a 3x4 brooder...which will last them till about a month. (space wise). Pending everyone has feathers, and the coop is built...could I put them outside? I'd prefer not to have to run extension cords for a heat lamp...or do you think it would be best to just separate the flock for an additional 2 weeks or so?