my last two coop designs have included a raised area for the inner coop where the hens roost. I line the area with something water resistant and durable, like plastic and fill with about 8" of mulch. I typically provide lots of ventilation, except on the harshest nights in the teens. the girls go in every day and turn over the mulch and bury the droppings from the night before. I have not cleaned it out in a good 8 months. periodically I scoop some out and throw it into the composter and add more mulch. this is a variation of the deep litter method, it ain't pretty but it does the job with minimal maintenance.