Mini-split HVAC systems create both heated and cooled air, and send them to just the rooms they are needed, while also redistributing existing disparities of ho

Mini-split HVAC systems create both heated and cooled air, and send them to just the rooms they are needed, while also redistributing existing disparities of hot and cold. The latter being the most efficient HVAC mode of all. I could imagine at some point, all our heated and cooled air, water, and ice could be one system. For fast temperature demands, such as hot water or ice, perhaps reservoirs of chemically stored heat and cold could be built up at useful locations, for very high speed release when needed. Completely dispense with storing hot or cold air/water, except for fridges. But provide the cool air for them, as a byproduct of being one system, avoiding the local inefficiency of both cooling air in small quantities and generating heat at the same location. It would make it cheaper to have more fridges and ice makers around a houses, if you just had to plug them into power and an HVAC controlled "inlet/outlet".