I have some new born easter eggers and a couple marans in a brooder in my spare bedroom. They were born thursday and seem to all be healthy. I have a brooder in my coop I want to put them in to free up my bedroom, but this morning when I went to check om my chickens outside, my broody hen " Big Momma" was under the heat lamp. Is it to cold for the chicks at night now? I have heat lamps, but seeing my grown hen under one makes me nervous. There is an open window in my coop, I have hardware cloth on, should I put plastic on it? Im new to chickens still so any advice is greatly appreciated!