1. In Cold or Wet Weather (Long-Term)
Recirculating humid air (from breath, wet coats) increases fogging over time.
→ Use only briefly to defog, then switch back to fresh air.
2. On Long Drives
Stale air = drowsiness, headaches, and reduced alertness.
→ Limit recirculation to 10–15 minutes at a time on highways.
3. If Your Cabin Air Filter Is Dirty
Recirculating dirty air traps pollutants, mold, and dust in your cabin.
→ Check/replace your cabin filter every year (it’s often behind the glove box).
Pro Tips for Maximum Comfort & Efficiency
Pair with AC: Even in winter, running the A/C (with recirculation) dehumidifies air—key for defogging!
Don’t leave it on auto: Many “Auto” climate modes use recirculation without telling you.
Know your car: Some EVs (like Teslas) have automatic recirculation—but manual override is best in extreme conditions.
Final Thought: Small Button, Big Impact
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