I have 17 4.5 week old chicks (2 of which are silkie bantams; rest are all large breed). I'm in Alabama and the weather is running 60s in the day with upper 30s-low 40s at night. They are bursting out of the indoor brooder and seem unhappy. I'd love to move them into their outdoor coop but I am afraid it's too cold. They would be confined to the coop which is very secure and well-built. When will it be safe for me to move them? I don't want to use supplemental heat plus it would be difficult for me to get electricity to the coop that could power a heat lamp. Maybe could run a heating pad? I have to run extension cord from my house and it's a pretty long way. I need your suggestions!!! Thanks!