Although I am not a fan of cryptocurrency popularity (mainly because of the potential to destabilize the macro economy), and I don't know much about this company: https://qarnot.com/en/home/, but I find they have a great name suggestive of thermodynamically optimal computing, Carnot being the father of thermodynamic efficiency. Carnot came up with thermodynamics to optimize steam engines, maybe making him the most steampunk of scientists. Thermodynamically optimizing bits is an echo of that for the cyberpunk age.
> Your house is not necessarily heated with electricity.
But it will be anyway, that's a matter of a few decades now. If you're currently replacing your heating system, I should hope you're switching to electricity.
Though I'd say let's get a heat pump and save like 2/3rds of the energy compared to making the heat from scratch. Depending on the climate you might need some additional heating a few weeks per year, and then yeah sure let's do mining, but that's not a stable basis for a cryptocurrency's security.