My major hen house is 12 x 14 and is deep litter on a dirt floor base. For the past 14 years I have added leaves and wood shavings to the floor and allowed the hens to scratch it all up. They crush up the leaves and mix it wit their own droppings. The heat from the composting layers underneath keep the house warm enough that I never have frostbite on hens or roosters. Each spring, I haul the mix to the garden and don't have to age it further. Then I haul in sandy soil for a new base. Each year I have hung a red light over the 7 gallon water container. If temps drop to the teens, then I will turn it on.