As of 2015, Trane rooftop HVAC units are up to 40 percent more efficient than traditional rooftop HVAC units. These rooftop HVAC units have varying efficiency rates among models.
As of 2015, Trane offers three series of rooftop air conditioning units: Intellipak, Voyager and Precedent. Each of these series offers several different models to choose between. Precedent units are the smallest units offered, while Intellipak units are the largest. The Intellipak units have some of the highest energy efficiency ratios in the HVAC industry. Trane's Voyager DC was proven to be up to 40 percent more efficient than traditional HVAC units and was awarded the Western Cooling Challenge Certification from the University of California.