Hi, I am in Sophia NC .. Originally from Lexington NC ... Maybe someone that know's how our crazy weather changes here can help me .. I have 18 chicks and they are 5 weeks old .. There brooder is getting really crowded ... They are still under a red heat lamp 250 watt .. I was wanting to switch then to their coop ... Does anyone know if it's too cold out for them to be switched?.. There is no way too put a light in the coop ... It's small but a lot bigger than there brooder box .. We have a PVC pipe run coming off the coop so they could have some yard play .. What is everyone's opinion?.. They are standard size birds all hens ... Barred Rock,RIR,Light Buff Orpington, Brahma's and austrolorpes (sp)Thank Kim