The newly designed Single Zone Series, with improved efficiency ratings up to 17.9 SEER, delivers high performance from the moment it's activated. In addition, its competitive price makes it a consumer favorite that's tough to beat. The featured Inverter technology is the latest evolution in compressor electro motors. A microcontroller continuously samples the ambient air temperature and the Inverter controls the electrical current of the compressor motor, regulating its speed and temperature. Inverter air conditioning units are quieter, more efficient, cost less to operate and have extended parts life. The Hessaire single zone condenser and wall mounted air handler is an ideal combination of superior product quality, energy efficiency, quiet operation and financial value. The pre-charged outdoor condenser makes DYI installation a breeze and allows for the line set to be trimmed to size without losing precious coolant. The condenser incorporates a high-performance compressor with eco-friendly, chlorine-free R-410A refrigerant.