Something to encourage you:

My house was built in 1790, post and beam, renovated in the 80s, but still not super modern. We have a wood stove in the living room, and a couple of fans to move warmer air to the bedrooms. Works fantastic all winter - all the heat we want and it’s free.

The cellar walls are stone (fitted loosely together - no mortar or anything. Like I said, 1790), and the floor is dirt. Anyway, heating with only wood for the past ten years. In all that time, I have never, not once, seen the cellar go below 45 degrees. I have a remote thermometer down there that sends its data to a station in the living room. Temp outside could be -5. The cellar is 45, and the living room is 80. It’s fantastic.