I need to find out how old chicks have to be before you put them outside in the coop/run in Ky when it's Cold? It is about 21 degrees out here right now. I have three totes full of chicks. One tote is full of 6-8 week old chicks and they are tryinging to fly (well....Jump out, they are silkies). We built them some hen houses out of wood and I was thinking about putting carpet over the outside to keep out the cold, putting a 250 watt lightbulb in the coop/run.? They are fully feathered now, but I just need a little feedback on this subject from others who live in the cold states? I know everybody don't keep their chickens in the house. I would at least like to get these older ones out in the pen if it won't hurt them? Thank you!