Read up on Deep Litter method. You put down about 8-12 inches of shavings. You stir the poop in and as it decomposes, it generates heat. The shavings will also insulate the ground. Come spring you strip everything out. I put a bale of straw down because that was all I had a few weeks ago and I'm ready to clean it out. So messy.
You have to have just the right conditions for the deep litter to work. Chicken poo is high in ammonis and, it things aren't JUST RIGHT, you can end up with all kinds of respiratory problems from the ammonia.