Bertrand I have to strongly disagree with you.
Sweat cools you by evaporating, hence keeping your vents open is the best way to evaporate that thin layer of water on your skin and making you cooler. When humidity is really high, heat becomes unbearable because sweat accumulates and evaporates slowly. Opening the vents on your jackets and pants, allowing the maximum flow of air to pass on your body to accelerate the evaporation of water is the best way to cool you down.
Suggesting to keep your vents closed during extreme heat is IMHO a very bad advice.
Google the physics of sweats and evaporative cooling.
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