Maybe we don't think of it as "tech", but what I would want - having bought a rather old house - is things that are passive, and will pay off future dividends.

Maybe we don't think of it as "tech", but what I would want - having bought a rather old house - is things that are passive, and will pay off future dividends. I want the place well insulated, I want windows placed in ways that will maximize pleasant and cooling breezes during good weather, ones that let in natural light but not let heat pass through during bad weather. I want good drainage, and plumbing that's easy to access and repair in case of damage or leaks.