Our coop is not finished and freezing weather is on its way, our ducks and chickens currently go in a pen covered in tarps. In a few days the temperature high is 25F and a low of 10F with a wind chill of around 5F and possibly some snow/ice, it will be like that for about 4 days. Will they be ok in the pen with that kind of weather? They have sand in there for bedding but I can add hay and even get some blankets to put underneath the tarps