We just heard a lot of very rapid, insistent meowing from the utility room door.
Apparently it is Ferals In The Utility Room cold out.
We feed two ferals we call Cassius and Barton. (There used to be a Natasha but I think another house snagged her.) Every winter we put a little space heater in the utility room for them. Cassius has discovered that he can train us to come when he meows at the door.