

It sounds like a technical problem but it is a political one. You need an entity that is independent from the malicious actors wanting to use surveillance for control. Once you have that, giving that entity able to manage all aspects without bleeding private information is a technical problem, but if you don’t have one to begin with, it is without hope.
If some people have the right to enter any building and any computer to sniff data without restriction, you can’t have privacy. It is a political problem.



(Mainland France) When I was a kid, my parents decide to move to a big ancient house with thick stone walls with a lot of repairs, we talked a lot about these things. back then, in the 90s, stone walls were considered superior than average insulation, as it was mostly inexistant at the time.
Nowadays, it is much inferior and you really need to add insulation to be a bit efficient.
Yep, here 13-14°C is the temperature of all the caves (that are not high in the mountains, altitude is a factor) and incidentally the temperature considered ideal to keep red wine.
This can be used with heat wells: have a way to exchange deep heat, with circulating water for instance, and in winter you can pre-heat your home at 14°C before adding energy. It is heavy work though to bury these pipes, and the efficiency of heat pumps nowadays makes this a bit irrelevant, but it is a nice low-tech possibility.