Well someone in my family passed leaving me in a bad spot , so I added A heat plate ( the producers pride) to now my quail pen cause they had wire everything other than the roof. They have hay and a heat plate , I know its risky but some have froze so its better than nothing.
If you want I...
My opinion is they should be fine but extra heat won't hurt .
I would add heat if there was no fire risk. Better safe than sorry but also not worth risking a fire.
If all that makes since?