I have 4 in the house that are 7-8 weeks old, not under lights, at 'room temperature' which is about 60 at night and 70 during the day, and 11 fully grown in the coop I'd like to put them in. I could put them in the bathroom for some transition time as I can keep it about 50-55 in there with the door closed (we don't use central heat)..Do you think that's advisable or not necessary? If necessary, for how long? We are in the mid to upper 30's during the day right now and the mid 20's at night, I have an incandescent bulb in the coop that is just warm enough to keep their water from freezing. What do you think?