Should the Car Air Conditioner Use Internal or External Circulation?
3 Answers
Whether to use internal or external circulation in a car's air conditioning depends on the situation: use internal circulation for short trips and external circulation for long trips. Internal and external circulation in cars refer to: 1. Internal circulation means the air conditioning system is closed to outside air and only recirculates the air inside the car; 2. External circulation means the car's air conditioning system is open to outside air, drawing in and circulating air from outside the car. The functions of a car's air conditioning are: 1. To cool, heat, ventilate, and purify the air inside the car; 2. To provide a comfortable environment for passengers, reduce driver fatigue, and improve driving safety.
As someone who frequently commutes in the city, I get stuck in traffic every day during my commute, and the air conditioning's recirculation settings are crucial. I usually prioritize the recirculation mode, especially on heavily polluted routes during rush hour, to avoid inhaling external pollutants, protect my health, and save fuel. However, keeping the recirculation mode on for too long can make the air stuffy and cause dizziness, so I switch to fresh air mode for a few minutes every 30 minutes to ventilate. On rainy days when the windows fog up, turning on the fresh air mode works wonders for quickly defogging. On highways, I prefer the fresh air mode to enjoy the refreshing breeze and stay alert. Remember to clean the air filter regularly; otherwise, no mode will work effectively. In short, switch flexibly based on the external environment and your own comfort—don’t cut corners to avoid unnecessary troubles.
Having driven long-distance for over a decade, my experience tells me that air circulation modes should be dynamically adjusted. On highways, I frequently use external circulation to introduce fresh oxygen, preventing driver fatigue and maintaining focus. During cold starts, I activate internal circulation for rapid temperature adjustment for a few minutes to save time, then switch back to external circulation to avoid stale air. In tunnels or polluted areas, I decisively switch to internal circulation for health protection. During rain, external circulation provides excellent defogging effects—safety comes first. Balancing between internal and external circulation is an art; don't rigidly stick to one mode. Refreshing the air every hour makes driving more comfortable. Maintaining good air filters enhances AC efficiency—these life details significantly impact the driving experience.
