It's forecast to get down into the 50's later this week. I'm wondering if I need to consider adding heat lights to my henhouse, especially at night. My chickens are almost 6 months old and not babies anymore. I know some breeds are more cold resistant than others. I have BR, Wyandotte and EE. They are also free range during the day. I know nothing about temperature control after they are fully feathered. Please help educate me!