Use Recirculation or Fresh Air Mode on Highways?

[DelMadelyn]

Use fresh air mode on highways. During prolonged high-speed driving, prolonged lack of air exchange can lead to stale air inside the cabin, so the fresh air mode should be activated to facilitate timely air replacement. However, if the air conditioning is on during summer, avoid using fresh air mode as it may compromise cooling efficiency. Even if air exchange is desired, it's advisable to briefly activate fresh air mode before switching back. Fresh air mode draws external air into the vehicle, directing it through the HVAC system for heating or cooling before being discharged through the vents. Its primary function is to introduce fresh air and improve cabin air quality. This mode is typically used for defrosting in winter or defogging in summer, as external air is richer in oxygen and drier, making it more effective for these purposes. Recirculation mode, on the other hand, circulates existing cabin air without introducing external air. Its advantages include fuel efficiency and faster cooling. Use recirculation mode when operating the heater in winter or the air conditioner in summer, as it prevents external air from entering, allowing the heating or cooling system to work more effectively.

[DelWalter]

When driving on the highway, I usually prefer the fresh air (outside air) mode. At high speeds, the outside air flows quickly, and turning on the fresh air mode allows fresh air to enter the cabin, preventing stuffiness and reducing driver fatigue. However, if I encounter smog or pass through industrial areas with unpleasant odors, I immediately switch back to recirculation mode to avoid inhaling pollutants. Recirculation mode is more energy-efficient, saves fuel, and cools or heats the cabin faster, but keeping it on for too long can cause window fogging or degrade air quality. I recommend switching between the two modes: for example, using fresh air mode for half an hour before switching to recirculation. This approach ensures both safety and comfort. On long drives, this trick has helped me a lot, keeping me more alert. Also, don’t forget to regularly clean or replace the cabin air filter, as it affects the overall efficiency of the system.

[LaAlivia]

When driving at high speeds, I prefer starting with the internal circulation mode, as it makes the air conditioning or heating work much faster and more efficiently, which is especially convenient. Although the external circulation mode can bring in fresh air, the strong wind outside creates a lot of noise, and you also have to guard against dust flying around. However, keeping the internal circulation on for too long can make you feel stuffy and dizzy, so I switch to the external circulation mode occasionally to get some fresh air, like turning it on for a few minutes when entering a service area. In terms of fuel efficiency, the internal circulation mode is unbeatable, while the external circulation mode consumes a bit more energy. For safety, don’t always drive with the internal circulation on; when there are many people in the car, it’s better to crack the window slightly and use the external circulation mode. Regularly check the air conditioning filter to ensure it’s efficient and not clogged.

[DeHailey]

When taking kids on the highway, I use the external air circulation mode to prioritize fresh air, ensuring they breathe comfortably and stay healthy. The internal circulation mode is energy-efficient and eco-friendly, saving fuel costs, but prolonged use leads to poor air quality, so I set it to automatic mode for smart switching. Pay attention to the weather and environment—switch to internal mode in foggy or dusty conditions to reduce highway noise. To prevent fogging, I often leave a small gap for ventilation. Regular maintenance of the air conditioning system keeps things hassle-free.