TLDR: it uses a desiccant to dry the air before it passes through an evaporative cooler, thus pre-cooling the air. At night when power is cheap it uses a heat p

TLDR: it uses a desiccant to dry the air before it passes through an evaporative cooler, thus pre-cooling the air. At night when power is cheap it uses a heat pump to dry the desiccant. You can get 4 hours use out of the desiccant. They also use alternative refrigerants "such as propane" but I do not see how that would improve efficiency, there are plenty of A/Cs using that today. I don't quite get how this reduces the energy consumption - I must be missing something here, or they've PR-ified it and it doesn't actually reduce total energy consumption, just reduces peak load. Adding water to salt and then removing it is at best an energy neutral process and in practice obviously involves losses and heat you cannot harvest (warm water vapor coming off of warm drying salt!) These A/C systems exist - search "desiccant enhanced evaporative cooling" - and have gotten more or less nowhere in the real world as far as I know. Am I missing something here or is there any actual total energy savings?