> It's simply not efficient, even with auto-closing dampers, to zone and duct a multi-zone system with single condensing units. You are absolutely correct. Yo

> It's simply not efficient, even with auto-closing dampers, to zone and duct a multi-zone system with single condensing units. You are absolutely correct. You end-up running a huge compressor for a small zone. I've always like the idea of chiller systems and the general concept of storing what you need during times of high efficiency to bend the curve in your direction. I haven't done any math on this at all but I've wondered what it might be like to cool the massive foundation slab most homes have as well as the ground directly underneath them during the night. Again, I haven't thought this through at all. Just thinking now that you would want to treat the soil in order to have a stab at improving heat capacity, etc. You could then use that during the day in a very careful way to compensate for heat flow. I almost envision radiator panels embedded into the walls with sensors to pump heat into the cold ground only as needed. Anyhow, there's probably a million things wrong with that idea. Air conditioning is one of these things that could be so much better.