Ok so I am new to chicken life I have inherited 3 silkies, a frizzle, 3 Brahmas, a buff orpington, 2 ameraucanas and a few more. Most are over a year, but a few are about 6 months. My coop is made of chicken wire and plywood. 2 sides are wire and 2 sides are wood. Do I need to put a lamp in the coop for heat. I'm worried they're going to get to cold at night. Today when I left for work there was frost on my car. I dont want them to freeze! They are kinda spoiled What do you guys think???