Should the Car Air Conditioning Use Internal or External Circulation in Summer?

[EliasLee]

In summer, it's recommended to first use the external circulation or open the windows for ventilation before switching to internal circulation. Many car owners habitually turn on the internal circulation as soon as they enter the car during hot summer days, thinking it will cool down the interior faster. However, this is incorrect because the inside temperature is higher than outside, making this approach less effective. Here are some relevant details: 1. External Circulation: This mode draws air from outside the vehicle, filters it through the air conditioning filter, and then circulates it inside the car via the blower. 2. Internal Circulation: This mode blocks the external air intake, recirculating the air already inside the car. Whether using internal or external circulation, exhaust gases inside the car will be expelled through the vents, so there's no need to worry about oxygen levels even when using internal circulation.

[BradyLynn]

During the summer heatwaves, as a frequent highway driver, I've found the best strategy for using the air conditioning is to alternate between recirculation and fresh air modes. When I first start driving, I always begin with recirculation mode because it recycles the cabin air, making the compressor more efficient and cooling the car much faster. Within minutes, the interior transforms from sweltering to comfortably cool. However, it's crucial not to keep recirculation on continuously, as the air can become stale and CO₂ buildup can cause fatigue—especially dangerous during long drives. After cooling down, I switch to fresh air mode for a few minutes every 20 minutes or so to bring in outside air, maintaining both comfort and safety. Additionally, regular AC maintenance like checking the cabin air filter and cleaning it before summer ensures better performance and energy efficiency. In short, smart mode switching delivers quick cooling while keeping driving safe.

[DeDamian]

As a mother of two, I'm very concerned about in-car air quality, especially when traveling with kids during summer. On sweltering days, I prioritize using recirculation mode to cool down the car quickly - the AC blasts cold air rapidly to protect my children from heatwaves. However, I worry stale air might make the babies uncomfortable, so after cooling I switch to fresh air mode for ventilation, alternating about every 10 minutes. Though fresh air mode cools slightly slower, it reduces odors and bacteria by introducing outdoor air, preventing drowsiness or dizziness. Actually, opening car doors to ventilate for a few minutes before driving in extreme heat makes recirculation work better when AC starts. This approach ensures family safety while making trips more pleasant. Health comes first - don't cut corners!

[DelDaisy]

As a car enthusiast, I've tried various AC settings. In summer, turning on the AC with recirculation mode does cool down the car the fastest. That's because recirculation reuses the air inside the car, reducing the compressor's workload, saving energy and cooling quickly. But the issue is you can't keep it on for too long, otherwise the air gets stuffy and affects driving concentration. I recommend using recirculation for the first 5 minutes to fully cool down, then switch to fresh air mode to maintain airflow. It's like letting the AC breathe, making the overall experience more comfortable. Simple AC maintenance, like regularly cleaning the filter, can improve performance. This method works great for short trips.