Keeping the temp at 40-50 is a virtual guarantee that, as soon as
the electric goes out for a couple of days in an ice storm or blizzard, you'll lose half your flock and every single comb and wattle in the coop! The "FB poultry doc" doesn't know what they're talking about.
I've recently quit FB entirely. Now that it's online monitoring of everything on our devices (not just FB posts) for illegal status and "seditious" behavior is "legal," I have no desire to use it any longer. I'm "legal" and "clean," but Big Brother can take a hike!