It's going to get down to 5° F tonight and I'm not at all prepared for it having never before seen temps like these in my years of chicken keeping. My coop is NOT insulated and when closed up only gets about 2-5 degrees above the external temps, which in our usual 40 degree nights is no issue at all, but is possibly dangerous tonight. I'm going to clear the droppings boards to minimize moisture but I need to know how I can bring the temps up inside without a heater. All ideas are welcome.