The Gree GSH-12NFV 1.0 ton inverter air conditioner is a high-efficiency ductless mini-split system that performs exceptionally well in single-room applications. This air conditioner eco-friendly R-410a refrigerant with this inverter technology that can help you save energy to start and stop the traditional process running. The green air conditioner outdoor air compressor is powered by a twin-rotary air compressor.