We have 9 chicks we got from Idealpoultry - we received them on 10/16. They've been in the garage so far with a heat lamp. They have a hot spot so they come and go from the heat. We live in mid GA so we've had some nights in the upper 20s outside. I have the ability to heat the coop/brooder outside but would feel safer not to have to heat it. When would you put them outside ?