Should the car air conditioning use internal or external circulation?
2 Answers
Whether to use internal or external circulation for car air conditioning depends on the situation. Use internal circulation for short-distance driving and external circulation for long-distance driving. Internal and external circulation in cars refer to: 1. Internal circulation means the air conditioning system is closed to outside air and only uses the air inside the car for circulation; 2. External circulation means the car air conditioning system is open to outside air, drawing in external air for circulation. Car air conditioning generally includes cooling devices, heating devices, and ventilation devices. This combined system makes full use of the limited space inside the car, has a simple structure, and is easy to operate, making it the internationally popular modern car air conditioning system.
When using the car's air conditioning, I prefer the recirculation mode to cool down quickly, reducing the compressor's workload to save fuel and make driving more economical. However, on highways, I switch to fresh air mode to introduce outside air and prevent window fogging, ensuring clear visibility for safety. In rainy weather or polluted areas, I promptly switch back to recirculation to block external dust and exhaust fumes. The key is not to use recirculation continuously, as it can lead to stuffy air and dizziness, so I manually switch to fresh air mode for about ten seconds every half hour to ventilate. Developing this habit ensures smooth operation of the air conditioning system, greatly improving comfort and keeping the car interior fresh even on hot days.
