I wouldn't recommend a heating pad cave outdoors in zone 6 (un-insulated coop) I only used one as a back up heat source and my chicks weren't a bit impressed sorry
I would put the heating pad in the category of an electric blanket you have to hug to stay warm where radiant heat allows the chicks to stay warm from a distance like a fireplace.
Clamp Lamps with guards and insulated porcelain sockets are safe to use with ceramic heat bulbs provided they're...
I'm converting an old shed to a shelter for 2 outdoor cats .The heating pad will be put to good use in there.The only heat source it has is a black ceramic bulb.
I bought a heat pad and made a cave for my baby chicks 2 years ago and added a black ceramic heat bulb too so they had both but the pad wasn't warm enough so they never used it.Its in my closet now
Baby chicks have no body fat and lose body heat fast. Whatever you use make sure the baby chicks have a stable heat source and don' crowd one another to stay warm or they'll suffocate and die. I only use heat lamps with baby chicks sorry