I am unclear if the the home is frame...or if it is block with wood trim.
Most builders in Florida are now using hardi-plank ( cement board) for siding now.
If you are only replacing trim...You might use pressure treated.
There are many small contractors/builders in our area that would be glad to give you some free advise
before you tackle a project. Good luck to you.
If a frame property is well maintained and has a termite bond...there is no reason why it shouldn't last forever.