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.