Trane 4 Ton 20 SEER XV20i 48000 BTU Variable Stage Heat Pump 4TWV0048A1000B Comfort is one of the key advantages of having the Trane 4 Ton 20 SEER XV20i 48000 BTU Variable Stage Heat Pump 4TWV0048A1000B as a member of your HVAC system. $10,399.00