Yeah, I will say that this isn't completely hypothetical to me. I've lived in Texas my entire life including through the winter blackout of February 2021. It was truly anomalous weather for us to be caught in single digit temperatures with no power to run any HVAC systems, and most homes don't have fireplaces. It was unpleasant, but in the end the cold wasn't particularly dangerous.
Since then, I've stored away a small indoor-safe propane heater with a few days of fuel supply and a 2KW generator.
Since then, I've stored away a small indoor-safe propane heater with a few days of fuel supply and a 2KW generator.