The 5 Ton 2 Stage 16.25 SEER heat pump system includes the following 3 HVAC units from Trane. 1) Trane 5 Ton XR17 17 SEER 2-Stage 60000 BTU Heat Pump 4TWR7060A1000D, 2) Trane 5 Ton 16 SEER 60000 BTU Convertible Air Handler TEM6A0C60H51SB & 3) Trane 20 kW (14.4–19.2 kW) Electric Heater BAYHTR1523BRKA with Breaker.