If maximum performance and efficiency are key, look no further than our Evolution™ System heat pump. This ENERGY STAR® qualified ductless system comes with a 42 SEER rating when paired with the 619PHA High Wall – there’s nothing more efficient1! Even when temps drop to as low as -22° F outside, your interior environment stays cozy (when properly sized and matched with specific indoor units). Powerful yet quiet, our best ductless outdoor solution delivers results.