I could see actually this working at a larger scale -- e.g. put a server room in the basement of a low-income housing project in a place with cold winters like

I could see actually this working at a larger scale -- e.g. put a server room in the basement of a low-income housing project in a place with cold winters like Chicago or Toronto and heat the building with waste heat during the chilly months. It'd also be worth it at that scale to wire the building for multi-homed fiber. Can't see it being practical at small house scale, and there's also some big security issues.