Chick cave created using hardware cloth leftover from coop construction. Sharp edges of the wire covered with two layers of duct tape to prevent any injuries. Heating pad laid over the frame, covered with a towel and an absorbent pad. I achieved 85 degrees in the cave. A little lower than it should be for the first week, so I dragged in my portable oil-filled radiator and am maintaining an even 80 degrees in the bedroom.