The latest bad idea: farm out servers to lots of buildings so that their waste heat can provide heat for the buildings.

That would be efficient in winter; not so much in summer. But what about the privacy implications?

The idea of "the cloud" means "Don't ask who stores your data (and can look at it); don't concern yourself with who does your computing (and controls how it is done). Put your blind faith in you-don't-know-who."

With this scheme, you put your faith in an unidentified homeowner as well as several unidentified companies.

Here's a better idea. Get your own servers to heat your water, and store your own data in them.