This is some old footage of when our furnace went out in our house at the beginning of 2018 with outside temps reaching the single digits at times. The house was without heat for a good few weeks . This was all during the time when our daughter was in NICU for a while and that was more of a priority to us than dealing with the house. We were bouncing between my mother's house and mother-in-law's house at the time. From what I observed, our house did reach a low of 32 degrees although it's possible it could've gotten lower than that since I wasn't there all the time.
When the guys came to install the furnace I decided to just see how my lipos were doing. I knew the cold probably wouldn't hurt em, but I was still curious to see how they were holding up especially since they haven't been checked for a while.