In the race against time during emergency missions, maintaining the cabin environment while the vehicle is stationary has long been an "invisible battleground." With traditional fuel-powered ambulances, maintaining cooling or heating in the medical compartment while parked required the engine to idle continuously. This not only caused massive fuel waste and mechanical wear but also introduced engine vibrations and exhaust fumes directly into the emergency scene—pain points that compromised the precision of medical personnel and the comfort of patients. In recent years, driven by the adoption of new energy chassis technology and upgrades to vehicle electrical systems, an independent DC electric air conditioning system has quietly transformed this landscape, infusing these mobile "arks of life" with a breath of cool, green vitality.