Funny. The latest tech in HVAC systems is heat pump with 4 way valves and I use them all the time. Somewhat laborious to explain in detail but suffice it to say the octovalve is just two 4-way valves on one heat pump using one coolant source. One 4-way valve services heating and /or cooling of the cockpit, and the second the battery pack, depending on how the valves are routing the fluid. They either dump heat into the cooler side or drawing heat from the warmer side, thus enabling it to heat one component and cool another at the same time with only one pump. It’s not miraculous, just a hybrid of something that’s been around for a while applied o a car.
I’m not bashing Tesla; it’s brilliant. What I’m really seeing is that it also ties into Musk’s musings about going into home HVAC. If he could introduce something like this and bring your home’s climate in alignment with your car, solar roof, power walls, etc...WOW! Fun stuff!