DESC: The indoor unit has been uniquely designed to provide Whisper Quiet operation while delivering comfort throughout the room(s). In addition, rotary compressors provide efficient, powerful cooling at the lowest noise levels in the industry. Fits with Various Sizes of Room and Life Style The multi-system type allows a single outdoor unit to be connected to 2 to 4 indoor units. It also solves the problem of limited installation space and does not clutter the exterior of your home. DC INVERTER is outstanding for it's RAPID COOLING & HEATING POWER. As soon as the temperature is reached, it automatically adjusts current frequency temperature fluctuation.