50VG Performance 16 SEER 2-Stage Packaged Air Conditioner System with Puron (R-410A) Refrigerant Single and Three Phase 2-5 Nominal Tons (Sizes 24-60) 50VG Performance 16 SEER 2-Stage Packaged Air Conditioner System with Puron (R-410A) Refrigerant Single and Three Phase 2-5 Nominal Tons (Sizes 24-60)