Don’t think this is accurate. The difficulty adjustment will kick in and lots of energy won’t be economic. Heating with electricity in most places is already inefficient. Doing it with bitcoin miners which aren’t designed to put off heat as their primary purpose won’t heat efficiently. And the electricity costs will not be competitive with other energy sources so they won’t win enough bitcoin to justify the miner expense. Further, miners that run 100% of the time are preferred to those that run intermittently. Heating environments that have electric heaters usually don’t need heat constantly, otherwise gas / propane is a better heating technology.

There will be some niche applications, sure. But widespread electric mining replacing electric heating is too optimistic, IMO. Sorry to be a Debbie downer.