I probably don't have much to worry about as far as keeping my chickens warm throughout the winter, but I keep cypress and pine needles under the roost which is a closed room in the coop about 8X9 ft. Well I have very little room left in my compost pile for anything to be added for now, but I do have some messy litter, so I am thinking it is time to change out. Here is the thing. If I put very deep litter........much deeper than I usually do and allow them to poop away all winter, how much in temperature difference do ya'll feel I would be looking at when I really have a hard freeze? I know the decomposition will generate some warmth, but I am just curious. 7 to 10 degrees would be wonderful in my opinion, but I don't know if anyone ever did a study on it or measured the temps in their coops by the use of this method. I plan on measuring my temps though. Then in the spring, I will have lots of poop to figure what to do with.......hopefully my compost will be ready to go into the garden and I can have a fresh place.