When the button is off, your vehicle pulls in outside air, conditions it (heats or cools it), and pushes it into the cabin.
Why It Helps on Hot Days
The air recirculation feature is especially useful in warm weather. On a hot day, the air inside your car may initially be very warm, but once your air conditioning cools it down, recirculating that already-cooled air is far more efficient than constantly cooling hot outside air.
By reusing interior air:
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