We suggest that air ducts and vents should be serviced every ten years, and in warmer climates such as Florida, it is recommended to clean them twice a year - once in early spring and once in early fall. It is essential to make sure that the service provider agrees to clean all components of the system and that they are qualified to do so. Although there is still debate about the value of regular duct cleaning, there is no evidence that such cleaning is harmful, as long as it is done correctly. To sum up, it is important for homeowners in Florida (or anywhere else) who want their air conditioning systems to work efficiently and safely for years to come to consider having their air ducts professionally cleaned every three to five years depending on their individual circumstances.
In addition, you can clean the vents yourself between maintenance visits. There are several ways to keep your ducts and vents clean so that you don't have to clean them as often. Knowledge about air duct cleaning is still in its early stages, so no general recommendation can be given as to whether your home's air ducts should be cleaned.