OP, the silly classic rock remark with the one, two, or three dogs (for heat) refers to the classic rock group Three Dog Night. Very small joke, but IF we wind up in the situation you're worried about, joking may be all we have going for us. Every bit of humor will be accepted.

We used a small kerosene heater when we lived in Japan. Of course, the houses weren't as air-tight as those here, so we used them all night on the worst weather nights. And we survived. I might not use them that way here in the US where we're so air-tight that we could die with no replacement oxygen coming into the house/apt.

We're in our late 60s/early 70s here, but out in the rural belt on the far side of Puget Sound. Lost power here the other day due to the wind storm that took down trees. Out of power for 18 hours, but then we're set up for that. Used our oil lamps for light, and managed to cook by the light of a few LED lights on the gas stove. Our hot water is gas also, so even in a long duration outage we can have a shower.

One thing you might consider is getting a few rolls of that bubble wrap and putting that up (bubble side to window surface) on the room you want to keep warm. I used clear package tape to keep it up, but you could use silicone glue too on some of the bubbles. We also built two of those candle/clay pot jobs. Ours was a set of three nested pots connected with a threaded metal eye-bolt that sits over the candle in another clay saucer for security for the candle.

As as a Christian, I believe we could see what is being called the 'snatching' of the Bride of Christ. Not a rapture, but taking out of danger of the real believers... not all those who go to church, but those who really desire to be faithful. If you're interested, one site is Thecallofthebride.com