A couple weeks ago, I had a hen with frozen toes. We brought her in and placed her on towels with a hot water bottle underneath. We also covered her with a towel and placed a heater in front of her to help warm her up. The good news is that she's doing GREAT and shows absolutely no signs of frostbite or other distress. Because I didn't want her to get too lonely, we brought another hen in to keep her company. They've been in the basement, in our dog's crate, where it's about 60 degrees or so. Now, I need to get these hens back out into the coop. I've heard that a rapid temperature change can kill chickens. Unfortunately, it's WINTER here in Wisconsin, and the only thing we have outside is snow and COLD! When I got up this morning, it was -5. I'm sure we're going to have a warm-up to may 20-30 degrees or so. Is that too much of a change for them? The coop does have two warming lights in it. Julie PS, some of you may remember we had issues with our coop being too drafty, which is why she ended up with frozen toes. We've since taken care of that problem by wrapping the entire outside of the coop in plastic (except for the vents at the top on one wall), and stapled cardboard to the studs and stuffed it with hay. We haven't lost another chicken and haven't had another one with frostbite since taking those measures.