Exactly. Kerosene or propane heater and some fuel.
Big Buddy propane heater has saved my bacon twice in the last two years. I live in Texas. I can’t imagine living in the northern US without a contingency plan.
This is our backup to the wood stove. Actually been letting the boy run it on low in his room on these zero degree nights.
Designed to fit two 1 pound cylinders but can also use a hose adapter for 20 lb cylinders which you can run two of. I've always just run one 20 lb. Running the heater on high will eat up that 20 lbs in a couple of nights. I filled 2 tanks before this cold snap we're on the tail end of. I don't think we've used half a tank yet.