Thanks everyone for your replies. I brought them in last night and they are happy. Unfortunately, I really didn't have a good "set up" for their temporary housing except an old blanket and a small animal playpen in the spare bedroom. What a mess this morning!! But they did not freeze, so I'm happy.
The water in their coop did not freeze last night, so it probably didn't get as cold as I thought it would. They spent the night before outside and it was down in the low 30's, and seemed to do okay. They are just about fully feathered so I may be a littled overprotected, but hey I'm a NEW MOM!!
I'll take it day by day until night temps really warm up.
Thanks again.