HI everyone I am in IL and it's starting to dip into the 20's at night. I have been adding some extra straw but at what point would everyone recommend putting in heat lamps? I have a flock of 10 who go in to sleep in a space of about 10 x 6, possibly larger just guestimating. Also, does everyone set up a pool for play or at what point is it too cold for them to play in the water? Thanks!