I'd say the winters are the only thing that gives me some concern.Thanks in advance.Winters are cold Summers are humid, but all and all it is a great place to be right now.

It is critical that you leave the ac on in Florida to remove the humidity.

It's ridiculously humid, even in October.

Plus, when my GF does move here to the states we have planned on moving farther North as she doesn't like the heat, humidity, and bugs :).

Naturally, I could charge higher to the end user (home owner).With all the hoo-hah over chlorinated refrigerants (there's no such thing as "freon" - that's a DuPont tradename) you're more eco-friendly if you have the chance to replace older systems.As a rental owner, you can reduce your long-run costs by replacing older systems as they fail.As a fix-and-flipper / rehabber you can get higher resale prices if you replace an older system.If you're planning what some have suggested - not replacing the condensing (outside) unit - expect them to fail during the next hot spell or extended period of high humidity.

Most of my residents enjoy this amenity, I am in Cleveland, Ohio and summer gets hot, humid and uncomfortable its a feature most appreciate it is a luxury item, so if the repair or replace is really all that cash prohibitive your call.. run a simple cash flow model on your opportunity cost, I know it sounds like a lot of work, but should only take 2 minutes you know your market, your renter profile, your rent potential, your sale potential - let the numbers do the thinking :) 

I would not use glue down in a high humid, high heat, or direct sunlight.  

One other thought, having traveled to Houston, it is very humid.

If this has high humidity, this can cause them to corrode much faster than expected.

The actual time interval would depend on a number of factors (e.g. humidity levels, air flow, etc.) that might quicken the drying process.