Heat Pumps Carrier® 25VNA Infinity® 20 Variable Speed Heat Pump The Carrier Infinity® Variable Speed Heat Pump with Greenspeed Intelligence and Puron® Refrigerant, Model 25VNA, is available in 2-5 ton nominal-sized units. Some of the standard Features include: 18 - 20 SEER/12 - 13 HSPF (based on tested combinations) Sound level as low as 58 dBA in low speed (Silencer System II) Variable speed compressor with capacity range from 40-100% > View the Complete Standard Features for the 25VNA Infinity® 20 Variable Speed Heat Pump Related Previous Product Next Product