If you look back through this thread, you will see some of these broodies are pretty far north. We were around +15 for lows when my bunch hatched in November and they were fine, even running around the coop at a few days old for long periods if not all day. Of course down here my coop has no heat or insulation; actually my coop is pretty open air. That said, I admit that below zero with wind is pretty low. As much as I hate heat lamps in coops, even I would be tempted. Maybe you could at least stop the wind -- is there room for bales of hay and some plywood on top, or something like that?
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Well, I think she is pretty much out of any wind, but that might be a good idea to add in some bales of hay -- they will probably get pooped on, but such is life.
Hopefully, my broody will be able to keep them warm; I'm just not sure what to expect since this is our first broody. Thanks for your ideas, ddawn.