My chicks are approx. 5 weeks old and getting rowdy in their box in the basement. I've already expanded it once. I was going to put them outside in the coop this week, but it's turned cooler. Will they be ok if I put them in the coop when temps are in the 60's during the day and lows in the upper 30's/low 40's? The coop is 4x4. I let them out in a fully enclosed pen during the day and they love it. They just need bigger quarters but I don't want them to freeze. Help?