The Infinity 20 Air Conditioner with Greenspeed Intelligence Seamlessly combines variable-speed operation with the Infinity System Control, this model was recognized as the Most Efficient of ENERGY STAR® 2019 and intelligently delivers the precise amount of cooling needed for current conditions. Then, it meticulously maintains those levels by making gradual adjustments as conditions change. You can relax and enjoy the comfort because it's one of the quietest air conditioners available, often running on lower speeds. And because it operates nearly continuously, you'll enjoy the added comfort of superior humidity removal during the hot, steamy summer months.