Server Farms in the form factor of Baseboard Electric Heaters
Thermostat calls for heat, applies power (or signal) to Server Farm / Heater. It immediately goes online (Ethernet cable, or WiFi) to auction its computational horsepower. At the same time it folds proteins and searches for alien signals for charity (because: Must. Make. Heat.). Etc. Obvious.
If this concept is implemented, then CPU cycles will be nearly free in winter. Or shared cost with heat.
Seems daft not to implement it. There's only about an order of magnitude price gap between a 1kw heater and 1kw worth of CPUs.