There are a lot of "pests" in Florida and homes with treatment systems are common. They could be either termite pre-treatment tubes used by builders to provide a preventive shield for the home for the first few years or "Baits" used around the parameter of a home to monitor for termite activity. My best answer is to ask a few more questions to determine what type of pest they are designed to treat, find out when they were installed ( they do expire), and whether a warranty is offered. The link below may also be helpful.
Yes - they work very well when they are installed and serviced properly.