New heat exchanger and new compressor have been developed in order to achieve high efficiency in the new series. As a result of these studies, the KXZ Series reached approximately 40% higher cooling efficiency (EER) and approximately 8% higher heating efficiency (COP). Mitsubishi VRF Air Conditioner The KXZ Series has a working range of approximately -20 degrees of heating and +46 degrees of cooling. There is a wide range of indoor units with 17 models and 92 models, including open and concealed types, offering good solutions for all applications. Mitsubishi Heavy VRF Systems will continue to develop products in order to provide high energy saving, low cost, space saving and comfortable air conditioning solutions.