The TrilliumSeries™ Condenser uses a patented Dry-Coil Adiabatic™ Design that saves energy, reduces refrigerant charge, and lowers operating costs. With the use of proprietary logic and EcoFlex controls, the On-Demand Adiabatic™ Pre-Cooler uses water only on the hottest days to maintain condensing temperatures that typical air cooled technology can not achieve.