The only place I use Sweet PDZ is on the poop board. I use a combination of pine shavings, leaves, grass clippings, straw, garden waste, etc on the floor of the coop and run. The chickens burrow in it when it's cold in winter and dig hollows and lay in them with their wings spread out wide when it's hot outside. I don't think that using PDZ on the floor of the coop would offer them much warmth in the winter, but it is certainly your call and you should do whatever you are comfortable with. For me, the PDZ on the poop board plus the deep litter on the floors keeps my coop odor free, and that works for me.