I have 7 leghorns and they are 3.5 weeks old! I've been letting them spend all day in their coop and then bringing them back in their brooder at night. I was wondering if I can leave them out all night in their coop? The weather is 80 during the day and 55-60ish at night. I'm worried about it being too cold? They love being outside, and definitely don't want to leave when I come get them at dusk. I'm a first time chicken owner and I love my little babies! Thank you!!