@jca2 Central Indiana here. I did indeed stay up all night. The pipes are in the garage against the back side of the living room wall. The garage is insulated, but not heated. The weather ap said it was about 1 F, and it sure was cold in the garage last night.
Normally the heat that escapes from that wall is enough to keep everything thawed out. However last night it was well below freezing inside the garage, but I caught it just before they burst. Two space heaters and the electricity didn’t go out! Woot!
Hubby woke up and relieved me of my vigil this morning at 5, so I fell into bed. He agreed that when it warms up, we will build an insulated structure around those pipes, and maybe a little heat source as well.