From inside (document excerpt):
25HCA3 ComforttSeries 13 Heat Pump with Puronr Refrigerant Sizes 18 To 60 1 1/2 To 5 Noninal Tons Product Data INDUSTRY LEADING FEATURES / BENEFITS Efficiency S 13 SEER/ 10.1 — 10.8 EER/ 7.7 — 8.3 HSPF (Nominal) S Microtube Technologyt refrigeration system S Indoor air quality accessories available Sound S Sound level as low as 74 dBA Comfort S System supports Thermidistatt or standard thermostat controls Reliability S Puronr refrigerant — environmentally sound, won’t deplete the ozone layer and low lifetime service cost.
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A04030 the environmentally sound refrigerant S Front–seating service valves S Scroll compressor S Internal pressure relief valve S Internal thermal overload S High pressure switch S Loss of charge switch S Filter drier S Balanced refrigeration system for maximum reliability Durability WeatherArmort protection package: Carrier’s heat pumps with Puron r refrigerant provide a collection of features unmatched by any other family of equipment. The 25HCA has been designed utilizing Carrier’s Puron refrigerant. The environmentally sound refrigerant allows consumers to make a responsible decision in the protection of the earth’s ozone layer. As an Energy Starr Partner, Carrier Corporation has determined that this product meets the Energy Starr guidelines for energy efficiency. Refer to the combination ratings in the Product Data for system combinations that meet Energy Starr guidelines. S Solid, durable sheet metal construction S Steel louver coil guard S Color matched, ceramic coated cabinet screws S Baked–on, complete coverage, powder paint Applications S Longline — up to 250 ft. total equivalent length, up to 200 ft. condenser above evaporator, or up to 80 ft. evaporator above condenser (See Longline Guide for more information.) S Low ambient (down to –20_F) with accessory kit Warranty Single-Phase 5 year limited parts warranty Three-Phase S 10 year limited compressor warranty 5 year limited compressor warranty 1 year limited parts warranty MODEL NUMBER NOMENCLATURE.