Tranquility® Rooftop (TRE) Series provides a rooftop WSHP solution to meet your application needs. The TRE product line offers the option of introducing a fixed amount of outside air year-round or a modulating Economizer to provide free cooling when outdoor conditions are favorable. TRE units are designed for an extended range of source water temperatures, making it suitable for closed-loop, or ground source closed-loop systems. With high efficiency scroll compressors and belt drive motors, the TRE product line offers 13+ EER and 4+ COP.