18,000 Btu TERRA Ductless Split outdoor Unit . The Terra Ultra Efficient Ductless Mini-Split Heat Pump System is the most energy efficient system ever created from GREE. It provides unrivaled comfort, quietness and most importantly energy savings. The Terra outdoor compressor section is powered by a twin-rotary compressor with GREE's G10 Inverter technology. This inverter technology with eco-friendly R-410a refrigerant saves you energy, reduces outdoor noise and keeps the room temperature steady by eliminating the constant starts and stops of conventional systems. The terra indoor cabinet is designed to be a comfortable fit for virtually any living space. A line-set (sold separately) is required for installation - be sure to select the appropriate size.a€¢ G10 Inverter Technologya€¢ Ultra High Efficiencya€¢ 27 SEERa€¢ Energy Star Qualifieda€¢ Photocatalytic Air Filtera€¢ 3 programmable Sleep Modesa€¢ 4-way Airflow operation (Swing)a€¢ Waterfall heating airflowa€¢ 7 Fan Speeds-from Mute to Turboa€¢ Gold Fin Condensera€¢ Photocatalytic Filtera€¢ I-Feel Automatic Functiona€¢ Low Ambient Cooling to 5?Fa€¢ Optional GREE Wired Controllera€¢ Low voltage start-upa€¢ Intelligent Defrosta€¢ 5yr Parts Warranty - 7yr Compressor Warranty