In recent years, along with global demand for the reduction of carbon dioxide emissions, refrigerants with a lower global warming potential are being increasingly used in air conditioning products. The adoption of such refrigerants is necessary not only for residential air conditioners and packaged air conditioners, but also for air-cooled heat pump chillers used for air cooling/heating in buildings or water chilling/heating in factories. Because installation space is limited, it is desirable to realize both larger capacity and better efficiency at the same time. Adopting a refrigerant that can contribute to curbing global warming, Mitsubishi Heavy Industries Thermal Systems, Ltd. (MTH) has developed the highly-efficient MSV2 series of air-cooled heat pump chillers featuring the industry's largest class 70 horsepower (HP) model. This report presents the product characteristics and specifications.