High temp today in Dallas is supposed to be in the 20's, down to single digits tonight. Yikes! I moved away from Vermont to get away from this kind of weather.
I have tiny bantams, so I've got an oil filled radiator running inside the coop just enough to keep it above freezing at roost level (about 38-39 degrees). I just came back from checking on the flock and they're all inside anyway, so I went ahead and closed the pop door, which should keep them a bit warmer inside. I noticed the waterer down at floor level had started to ice over, so I brought out a fresh one with warm water from inside.
It's going to be a long couple of days. If the power goes out, I'll have to bunk our girls in dog crates inside our attached garage which is big enough so that it won't get below freezing without power for 12 hours at least.
I have a great deal of sympathy for Northern chicken keepers who have to deal with this kind of weather all winter. It really makes doing the morning chicken chores hard to roll out of a warm bed and go into wind chill in the single digits!