I live in a sauna down here in south GA (30 miles north of the Fl line). We've had an abundance of rain over the last two months, and combined with temps in the mid to upper 90's equals humidity above the 90% range...... in other words, it's moist down here in the land of cotton. There's so much moisture in the air that it makes pretty much any physical exertion feel to the body like you're breathing through a drinking straw.
When I was a teen, I could work 12-14 hours out in this crap cropping tobacco, pulling weeds from peanuts, and laying irrigation pipes etc. I worked in a hot industrial complex for years (we had equipment running anywhere from 300 to 1400 degrees year round) but it was drier air inside than out.
Our current A/C unit is twelve years old. The warranty ran out two years ago, but just before it did we had two new fans installed and it runs well (knock on wood).
We put a metal roof on the house five years ago and it helps some in summer, but really cut down on winter heating bills by 50%.