Yeah a large scale solution involving helium will not scale. Helium cannot be produced by any process other than hydrogen nuclear fusion, and has to be harveste

Yeah a large scale solution involving helium will not scale. Helium cannot be produced by any process other than hydrogen nuclear fusion, and has to be harvested in nature from natural gas wells. Using it in nuclear reactors is one thing, but at home? Since most of the worlds natural gas is in Qatar and Iran, the world will just have a helium resource crunch if this becomes widespread. Maybe a better working gas to use would be ammonia or desiccated propane. Maybe the ultimate solution is to have neighbourhood heating/cooling units that serve multiple and pipe hot/cold water to them.