My 6 mixed breed chickens are 8 weeks old tomorrow. Just today I was able to secure the underside of our 6x8 playhouse-to-chicken coop conversion. A light rain came in a little quicker than I had expected and I was not able to secure the inside of the coop. The chickens are in the underneath of the coop on sand. It's only supposed to get down to 52 tonight but I am nervous for the chickens. They have been in our temp regulated garage and have never been outside overnight. Will they be alright in the open underside of the coop?