At 4:30 this morning it was 43. So not long until we start hitting freezing temps and lower. My FLOCK! is Speckled Sussex. They are allegedly hardy cold weather birds. Their coop is compact, built for 10 but I only have 5. They seem to roost together on one of the 2 roosts all facing the same way (the line of poop confirms that). Will I need to put some heat source in there or will they do fine? Because I occasionally will be gone and relying on the neighbors, I'm trying not to have to close up their small door to the pen. I also like the ventilation it provides (there is another vent at the roof line). There is plenty of straw inside and they keep rearranging it to their changing tastes.... Heat or not???