I live in Northern Indiana and we just put sand in the coop in the fall. Before that, they had starw on the dirt floor. With all the rain and now some snow, their sand floor is wet. They have straw in the nesting boxes. I have left their pop door open to help ventilate, and they have a heat lamp that comes on from 3am-8am, mostly for the light. The walls have clear plastic on them, but I am afraid that they might be too cold and wet. What should I do? Help, please!