Should the Car Air Conditioner Be Set to Recirculate Mode?

[StephenLee]

Yes. Here are the situations when using the air conditioner's recirculation mode is recommended: 1. To maximize the cooling or heating effect: In hot summers, the first thing to do after getting in the car is to turn on the air conditioner. At this time, setting the air to recirculate mode can save cooling time. The same applies in cold winters when you want to quickly warm up the car interior. 2. When idling in place: When the car is idling, the engine is still running and produces a large amount of carbon monoxide and carbon dioxide exhaust, even though it's not generating power. It's essential to turn on recirculation mode to prevent outside air from entering, as the air quality behind the car is poor due to exhaust emissions. 3. When the outside air is polluted: Use recirculation mode when the outside air is poor, such as in dusty areas, places with strong odors, or during smoggy days in big cities with heavy vehicle exhaust emissions.