Which air circulation mode should be used when parking a car?

[PaisleyLynn]

Whether to use the internal or external air circulation mode after parking and turning off the car depends on the vehicle's system settings or the external air environment. Long-term parking also requires consideration based on actual conditions. Some car models are preset to automatically switch to internal circulation mode after parking and turning off, while others default to external circulation mode. For vehicles without preset modes, the decision can be made based on the environment. For example, in humid, dusty, or odorous areas, it's advisable to use internal circulation to maintain cleanliness, good air quality, and dryness inside the car. However, using internal circulation in humid weather can increase moisture inside the car, potentially dampening the seats.

[DelLayla]

Having driven various cars for decades, I prefer using the recirculation mode when parked. During city driving, especially at red lights or in traffic jams where exhaust pollution is severe, turning on recirculation blocks harmful air outside to protect health. The air conditioning cools faster and saves fuel by recycling the interior air instead of processing the outside heat. It's particularly useful in summer for quick cooling. Remember to check the cabin air filter regularly, replacing it about every six months to prevent musty odors. Using recirculation briefly while parked is safe, but if waiting too long (e.g., over 20 minutes), slightly open the windows to ventilate and prevent CO₂ buildup, ensuring fresh air circulation for a comfortable and worry-free driving experience.

[SanSophie]

As a young driver, I'm used to using the recirculation button when parking—it's simple and practical. The main benefits are fuel efficiency and environmental friendliness, as it prevents hot outside air from entering and reduces the workload on the AC compressor, extending its lifespan. When stopped at a red light or in traffic, switching to fresh air mode lets in unpleasant exhaust fumes, so I switch to recirculation to block pollution and keep the cabin air clean and fresh, improving my driving mood. While automatic AC systems adjust intelligently, I prefer manual control for peace of mind. Combined with regular AC maintenance and duct cleaning to prevent bacterial growth, it's both healthy and hassle-free.

[DelCamilla]

Health is very important to me. I always use the internal circulation mode when parking to prevent external toxins such as exhaust particles and pollen from invading and damaging the respiratory system. The air conditioning efficiency is improved, and the interior temperature remains stable, avoiding large fluctuations for higher comfort. It is safe to use internal circulation for short stops, but for prolonged parking, it is necessary to open the windows for ventilation every 10 minutes or so to ensure fresh air supply. Combined with monthly checks of the air conditioning system's filters, this maintains air quality, ensuring a worry-free driving experience and easier breathing.