Our most efficient model, American Standard® Platinum series, includes innovative American Standard Link technology to control all of the system components. The Platinum 20 AccuComfort™ Variable Speed unit is one of the industry’s most efficient variable speed air conditioners offering up to 21.50 SEER2 and available in 2, 3, 4, and 5-ton models. This unit features a woven Spine Fin™ coil, Duration™ Variable Speed inverter-driven compressor and compatible with our American Standard Link communicating technology. Even on the hottest days, it cools your home with precision, keeping you comfortable throughout the day.