i have 5 chickens that appear to be fully feathered (this is my first go around). They will be 8 weeks tomorrow. They have been outside everyday in the coop and we bring them in at night. They are never happy to come in and seem to be ****** in their brooder (which is in the house-not garage or shed temp wise). We live in California where it is in the 40s at night. Are they ready to stay outside?