The XC20 is among the most energy-smart air conditioners on the market. That means you can feel good about your comfort and your energy use all year long. This product has been designated as one of the Most Efficient ENERGY STAR certified products in 2022. Products that are recognized as the Most Efficient of ENERGY STAR in 2022 prevent greenhouse gas emissions by meeting rigorous energy efficiency performance levels set by the U.S. Environmental Protection Agency.