People are surprised that peaches grow in a warm climate. They grow very well, provided you buy a variety bred for mild winters and you are ruthless in March.
Chill hours, briefly
Deciduous fruit trees count hours between roughly 32F and 45F over winter and will not break dormancy properly until they have banked enough. A Georgia peach needs 800 or more. A warm climate delivers somewhere between 150 and 400 depending on the year. Plant an 800-hour peach here and it will leaf out raggedly, flower poorly and never crop.
The University of Florida has spent decades breeding peaches that need 100 to 250 hours. Florida Prince, Tropic Beauty and UFBest all fruit reliably here.
Thin the fruit, and thin it harder than feels right
This is the step everyone skips. A peach tree sets many times more fruit than it can ripen. In March, when fruit is marble sized, remove enough that what remains is spaced roughly six inches apart along the branch. You will feel like you are destroying the crop. You are converting a hundred inedible marbles into thirty real peaches, and you are preventing the limb breakage that comes from an over-loaded branch.
Prune to an open vase every winter
Peaches fruit on last year's wood. Cut the centre out, keep three or four main scaffolds, and open the tree so light reaches the interior. A crowded peach tree in Florida humidity is a brown rot problem waiting to happen.