Those are great in dry climates but don’t work so well in humid places like TN.
That's the conclusion I have drawn from the many discussions on this topic.
It seems that in humid climates the best way to cool the body is to increase the air flow over the skin, so the suggestions about getting a shorter windshield, adding Baker Air Wings or the BRP adjustable deflectors are all good. Of course, well-ventilated riding gear is essential, also.