Single Package Rooftop Ultra-High Efficiency Electric Cooling Units 2 to 12.5 Nominal Tons 50PG units are single-package, ultra high efficient electric cooling with optional electric heat rooftop units. These units provide industry-leading operating efficiencies, ease of maintenance, installability, and reliability. Units come pre-wired and pre-charged with Puron® (R-410A) environmentally sound refrigerant at the factory. Units are factory tested in both heating and cooling modes. 48/50PG centurion rooftop product tour Interactive Tour (requires Flash) Performance Features Puron (R-410A) HFC refrigerant SEERs up to 15.0, EERs up to 12.7 IEER up to 13.5 Low sound levels as low as 72 dB Single-stage capacity control on 03 - 07 models Multi-stage capacity control on 08 - 28 models TXV refrigerant metering system on each circuit Cooling operation up to 125° F ambient Foil faced insulation encapsulated throughout entire unit minimizes airborne fibers from the airstream