HVAC units and air distribution systems form an integral part of how air-conditioning systems work inside trains. These must be of an increasingly high standard, also in terms of sustainability and energy saving. That’s without forgetting the legislative provisions that oblige us to pay constant attention to each system’s impact on the environment. The Mitsubishi Electric Klimat Transportation Systems Spa team of machine and HVAC system designers therefore constantly aim at implementing and researching products and technologies that are able to efficiently meet new requirements.