When I saw futureproofness I thought you were going to talk about repairability. Thats probably my biggest concern. My heating system is largely made out of commodity parts. Aquastats and zone control boxes form the control system, copper pipes soldered on, pex crimped on. All parts you can buy at any hardware store in the country, and all interchangeable. As long as the actual tank and fire tubes in my boilers are intact, I can keep them running as long as there is oxygen. While I know the basics of refrigeration, I don't actually know how interchangeable any of the internals are, but I kinda expect them to be less interchangeable than my old boilers.