Here’s What the Air Recirculation Button Really Does in Your Car

When You Should Turn It Off

Despite its benefits, air recirculation isn’t ideal in every situation.

In Cold or Rainy Weather

During winter or rainy conditions, you generally want fresh air coming in. Recirculating interior air can cause moisture to build up inside the cabin, leading to foggy windows. Bringing in outside air helps reduce humidity and keeps your windshield clear.

For Long Drives

If you leave recirculation on for extended periods, especially with several passengers in the vehicle, carbon dioxide levels can slowly increase inside the cabin. While modern cars are not airtight and still allow some air exchange, you may notice the air feeling stuffy over time.

Switching back to fresh air mode periodically keeps the cabin feeling fresh and helps maintain alertness.