By building a better heat pump, one that can perform in just about all conditions, Trane is a major driver of the rapid adoption. The Trane 20 TruComfort Variable Speed Heat Pump with WeatherGuard stands out for its innovative design along with Trane’s solid reputation for quality and reliability. BIG ENERGY SAVINGSWith a SEER2 Rating of up to 22.4 and an HSPF2 Rating of up to 10.5, the Trane 20 TruComfort Variable Speed Heat Pump with WeatherGuard is up there with the most energy efficient heat pumps our team has ever tested. We also like that the Trane heat pump uses a new refrigerant, R-454B, which boasts a Global Warming Potential (GWP) 78% lower than those of its predecessors. RELIABILITY OVER THE LONG HAULThe first version of the Trane 20 TruComfort Variable Speed Heat Pump that we installed in a tester’s home in New York has worked flawlessly for four years now, through bitter-cold winters and long, hot summers.