Honestly it could be hardly used in practice. The frontier of cooling is: - living in MODERN, so air-tight, well insulated buildings, designed to get the Sun w

Honestly it could be hardly used in practice. The frontier of cooling is: - living in MODERN, so air-tight, well insulated buildings, designed to get the Sun when needed in winter, but not get it in summer with simple design choices etc; -living in places where nights are fresh and having p.v. to cool with no energy consumption from grid during the day. Now the above points are a bit bold but try reasoning why we live where we live. In the past places where circadian thermal delta was/is lower was very good places because it was less hot than now and there was no cheap heating. Similarly living in some places very deep in a valley was nice because floods was a thing anyway, but having clean water was invaluable and homes back then have had much less things who can be damaged by floods. Climate have change but technology, human living is changed much more. In the present world many inhabited parts of the world that back than was nice places, today they are not and others back than not so nice today are nice places. In the past being many in a single places means: - being able to defend against enemies - having access to all professions and services - having trade and learning opportunities - be more exposed to illness, BUT being able to get help much easier now? It means that - 9/11 alike attacks or simple drone attacks are much more easy and deadly - you get more dysfunctional services because we are too dense for them in too many place (as an example packages delivery in large condo complex vs single family homes) - be more exposed to illness, with sometimes even LESS chances of a quick aid - being mostly limited by nearby activities instead of having plenty of space for build a new one and remote work Try to weight this, in terms of opportunities, disasters and who win vs who loose.