I left the sand on the floor and have PDZ mixed in with everything. It just seemed to taterin cold in there. Their area of the coop is roughly 12' x 12' with a 11' 6" peak. They roost on a rafter 6' 6" up... (tried to stop them)I'm just curious....why didn't you keep the sand for the winter? I also use sand in my run and my coops.
There are 15 birds in there. (2 small ones) I did my best to block the wind from blowing under the coop but it's pretty high off the ground in the back.