As global emergency medical service systems continue to evolve and improve, the capabilities for controlling the internal environment of ambulances are being redefined. In the past, vehicle-mounted air conditioning was often viewed merely as an optional feature designed to enhance driver and passenger comfort; however, with the ever-increasing demands of pre-hospital emergency care regarding patient physiological stability and operational continuity, electric climate control systems—operating independently of the vehicle's engine—are gradually becoming a core functional module in the new generation of ambulances.