The RGLX series Halcyon circular-flow ceiling cassette system uses a DC twin rotary compressor, DC fan motor, and refrigerant cycle control. The units reported achieve as much as 21.4 SEER. Using 360-deg. louvers, the airflow design allows conditioned air to reach every corner of an area. Each louver can be individually programmed to customize airflow for maximum comfort and space layout. A four-speed fan control provides sound levels in Quiet Mode as low as 28 dB.