Hi Hkeibard-
I'm on the east coast of Central Florida, so our weather should be pretty similar. Heat has been a huge concern for me, days and nights. Cold? What's that?

I thought I'd chime in and share my setup, even though it's still evolving, and I'm only two years into this adventure myself! Chickens...or as the other half calls them, spoiled rotten little dinosaur Princesses.
During the day in the heat, I always leave a few inches of water for the hens to stand in on the shady side of the run (not for babies, of course- we want NO Drownings!) My darker hens (Barred Rocks) take advantage of it regularly throughout the day, and will just stand there for 5-10 minutes before moving on- I assume they use it more because their dark feathers hold the heat, but that's just a guess- however I have never seen my BOs or any of the Americaunas do more than cruise through the water. I tried a few different containers, but wanting low sides and enough weight that it wouldn't tip over, I found an old concrete birdbath basin worked perfectly for my little flock. I also freeze blocks of ice, and take them cool treats (almost frozen peas and corn kernels are a huge hit here) during the worst of the heat.
My coop is big for the size of my flock (5'x8'), but in the heat they will spread out along the roosting bar. Having an 8 foot bar is crazy for 5 girls, but hey, I had read so much about space, space and more space that I took it to heart and I'm glad I did.
At night, I turn on a small fan in the coop, pulling air from one side window and pushing it towards the opposite window, and not directly where the girls prefer to roost. They will move into the breeze when they want to, though.
In the run, I have a large all-weather shop fan that I run during hot days that keeps the air moving through the 20' x 8' ft long run, and I am not sure who appreciates that most- me or the girls. It also keeps the number of flying pests I deal with down.
One thing I do want to mention is mosquitoes. I have had a camera in my coop almost from the beginning, and the first night I was shocked at the incredible number of mosquitoes that were harassing my ladies. 100s of them, no joke. They clearly annoyed my hens from the constant shuffling about and failure to settle. The next day screens went up over all the openings. Sure, a stray mosquito may get into the coop during the day via the hen's door and get locked in with them, but that's better than an army, imho. Health hazard for the hens? I dunno. I do want them to be able to rest though, and it only cost me a roll of screen and some left over wood from the build. I only did the coop though, not the entire run. The shop fan does a good job of keeping they flying pests out of the run.
Hope there is something in there that helps you!