As the modernization of global emergency medical systems accelerates, ambulances, often referred to as "ICUs on wheels," are undergoing a profound power transformation. In this transition from traditional fuel-powered chassis to new energy chassis, ensuring that the environmental control within the emergency compartment neither relies on engine operation nor fails to meet stringent medical requirements has become a key focus of the industry. Addressing this challenge, DC electric air conditioning technology specifically developed for electric ambulances is maturing, providing reliable assurance for the entire closed-loop process of emergency medical missions.