What Mode Should the Car Air Conditioning Be Set to When Driving on the Highway?
2 Answers
When driving on the highway, it is best to set the car air conditioning to the external circulation mode, or start with internal circulation and then switch to external circulation after a while to ensure smooth air flow inside the car. Below are the relevant introductions: Internal Circulation: The so-called "internal" refers to the air inside the car. When the internal circulation mode is activated, the air is confined within the car, and outside air cannot enter. This helps maintain a constant temperature inside the car, as internal circulation significantly reduces the frequency of air exchange between the inside and outside, thereby also lowering fuel consumption. External Circulation: External circulation involves the exchange of internal air with the outside air, keeping the air inside the car fresh. This provides the driver with a comfortable driving experience and is also beneficial for health by allowing the inhalation of fresh air.
When driving on the highway, it's generally best to keep the car's air conditioning in recirculation mode. High speeds and strong winds on highways can cause dust and exhaust fumes to enter the car through fresh air intake, affecting air quality. Using recirculation blocks these contaminants while improving cooling/heating efficiency, saving fuel and hassle. I particularly recommend this method for long-distance driving as recirculation cools the cabin faster without stuffiness. But remember safety - briefly switch to fresh air mode for about a minute every hour to prevent window fogging and maintain visibility. This technique works especially well in summer heat and remains effective in winter. Always check if your cabin air filter is clean, as clogs can reduce ventilation efficiency. Road safety comes first.
