Shandong Longertek Technology Co., Ltd. engages in the research, development, production, sale, and maintenance of rail transit vehicle air conditioners and their control systems in China and internationally. It offers track and new energy vehicle air conditioners, thermal management products, air energy heat pump drying equipment, digital energy intelligent environmental control products, and their control systems, as well as new energy equipment, professional computer room temperature control products, and industrial integrated air conditioners. The company was founded in 2000 and is based in Jinan, China.