Good plan. 50° is more than survivable.
When the power went out here in Michigan during an ice storm we opened up the vents in the basement and set the kerosene heaters below them, shut off unnecessary vents andhung blankets in doorways. It worked long enough.
When an ice storm knocked out power in NH some years ago, we went outside to survey the damage, and there were generators running EVERYWHERE.
When we were doing our house hunting, almost every place we looked at had pictures of their utility panels and water systems.
Easily half the electrical panels had build in generator hook ups.
Nor’easters knock out power pretty regularly here and generators and wood stoves are just about standard features of home ownership.
There are so few places in this country that aren’t at risk of losing power for a few days due to weather or other natural disasters, that I don’t get why more people are not better prepared.
Kerosine heaters indoors??!!