The Goodman® brand DSZC18 18 SEER Heat Pump uses the chlorine-free refrigerant R-410A and features energy efficiencies and operating sound levels that are among the best in the heating and cooling industry. The DSZC18 contains the two stage, high efficiency Copeland® UltraTech scroll compressor, which provides improved temperature and humidity control. This unit is designed for the consumer who desires superb comfort and quiet operation.