Hi! I have five chicks that are six to seven weeks old. Two of them are Rhode Island Reds, two are Barred Rocks, and one is a Danish Brown Leghorn. They are my first and only chickens, but I have a coop set up and ready to go for them outside in the yard. The past two weeks I've been taking all of them outside for a couple hours every other day. Is it time for them to go outside permanently? The temperature is about 70-85 degrees during the day, but can get into the low 40's during the night. I have no way of heating the coop, so I am just worried that they might be cold during the night. Will they be ok, or should I wait another week or two? Or is there something I can put into the coop for more warmth, like extra pine bedding? Thanks!