I do heat my coop when it gets 0 or below. I use a cozy legs radiant flat panel heater from target online.
http://www.target.com/p/cozy-legs-r...357#prodSlot=medium_1_1&term=cozy+legs+heater It works for me as my henhouse is pretty small (4x6)
I wasn't going to heat, but due to all the moisture this winter, I also had some frostbit combs (buff orp and golden comet), could not get it dry enough when it was 80 percent humidity outside, so added the heat. Plus, it just pretty much took the edge off, so when it was -24 outside, it was around 0 degrees inside the henhouse. 24 below is brutal, even for chickens. If the electricity went out, as my henhouse is insulated it would hold the heat for awhile, and I don't think that going from 0 to -24 would kill them. I think it is just easier on them to not have to try and use the extra energy to stay warm when it is that cold. Now, I would not recommend heating to say 50 or anything like that when it is -24 out, that would kill them if the electricity went out. but putting on some heat to heat it up to 0-10 degrees F, I think is fine. Just to take the bitter edge off.
Goose seems be better, maybe 80-90 percent herself. I threw her out with the other girls tonight, kept an eye on the situation, I didn't want to put her out there yet as I'm not sure she is strong enough to stand up to them, but the longer I wait the worse it will get. She seems to be holding her own. I need to keep an eye on the situation and make sure she is still gaining strength out there. poor little girl
she has been through alot in the last few days!