As cities worldwide accelerate the green upgrading of public transport to reduce carbon emissions and improve urban ecological quality, bus air conditioning—once seen as a “supporting component”—has gradually become a key link in promoting the low-carbon transformation of bus fleets. Its environmental performance, energy efficiency, and operational stability directly affect the overall green development level of public transport systems.
The core role of bus air conditioning in this upgrading lies in its adoption of eco-friendly technologies. Taking CO₂ air conditioning systems as an example, their use of natural refrigerants eliminates the environmental risks of traditional refrigerants (such as ozone layer damage and high greenhouse effect), making them a standard configuration for new energy buses (including electric and hybrid buses) in many regions. In actual operation, these systems can reduce the bus’s overall energy consumption by 12%-18% compared with conventional air conditioning units, which is crucial for extending the battery life of electric buses—a long-standing concern for public transport operators.
Beyond technological adoption, bus air conditioning also contributes to the “whole-vehicle green management” of public transport. We have collaborated with bus manufacturers to develop integrated cooling/heating solutions: for electric buses, the air conditioning system is connected to the vehicle’s power management system to dynamically allocate energy between driving and temperature control; for urban buses with high passenger flow, we have optimized air duct design to enhance cooling/heating uniformity, reducing unnecessary energy waste caused by uneven temperature distribution.
Practical cases further verify this role. In a southern city’s public transport fleet upgrade project, the deployment of CO₂ air conditioning systems helped the fleet reduce annual carbon emissions by over 2,000 tons, while lowering maintenance costs by 15% due to the system’s stable performance. Such results have made bus air conditioning a key consideration in public transport green procurement policies.
Looking ahead, as public transport moves toward “full-life-cycle carbon reduction,” bus air conditioning will need to deepen integration with smart urban transport systems—such as adjusting operating modes based on real-time passenger flow data—and continue to optimize environmental performance. By doing so, it will better play its role as a “green engine” for the sustainable development of public transport.
