Trane XR14 Series 3 Ton 36000 BTUh 4TWR4036N1000 unit is a 14.8 SEER2 outdoor split system single-stage heat pump that is both a reliable and efficient heating and air conditioning system suitable for your home HVAC needs. The 14.8 SEER2 rating of this 3 Ton XR14 single-stage heat pump will help cut the HVAC costs drastically.