Instead of using space heaters, during chilly winters, I mine Monero using `xmrig` (MacPro5,1/VEGA64/Ubuntu). The money would have just turned into heat, anyways (might as well try to win a block/XMR), and the computer is 15+ years old (eWaste).

I know several people IRL that will pay cash for anything scarce. You probably do, too (start asking)...