I am a first time chicken owner and need some help.. I have 6 new chickens (3 Leghorns and 3 Sexlinks) they are turning 4 weeks this Friday! They are currently in my brooder box with my 2 new chicks (EE and Sussex) and I don't know when to put them outside in the coop! I live in north Georgia and the current temperature is around 70 during the day and 50 and below during the night. If the go out in the coop right now they will not have a heat source. Just wanting to hear everyone's opinion on what I should do.. Coop pictured below!!!