Ok, I have 3 chickens. A Rhode Island Red, Silkie, and a Barred Plymouth Rock. They have completely outgrown their brooder. They are 8 1/2 weeks old; and I recently finished my coop and moved them out today. I am afriad that they be cold and cause health problems. I live in Sacramento , California, so tempteratures usually are mid-70's during the day and dip into the upper to mid-40's at night. I was wondering if they are ok out there. Do they still need they're heating lamp? Or will the huddle together and sleep? The coop doesn't have horrible drafts. Thanks for help in advance.