I saw a prepper type on a video that bought a couple of dump truck loads of coal at 35 dollars a ton. Had it dumped into a big hole in his backyard and covered it in dirt.
Ten tons of coal in his own personal backyard coal mine in case of end of the world.
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seems that the coal could contaminate a well if stored like that
That’s an interesting approach.
A quick search indicates you can heat a 2500sf house with 3 tons a year in location with a Great Lakes region winter.
That sounds right to me also. But that’s what I saw on TV. I didn’t see that he lined it.