Why do coils and blowers get dirty so fast here?
Fort Lauderdale is warm and humid for most of the year, so A/C systems run a lot. More running time means more air passes over the coil, and more dust that slips past the filter ends up on it. Humidity adds moisture, which turns dust into a film that is hard to shake loose.
The drain pan under the coil is another problem spot. Slime and sludge can build in damp pans in warm climates, and a slow drain can lead to water around the air handler. Air handlers in garages and attic closets also pull in dusty air if the cabinet or the returns leak.
If you want the whole system cleaned, ask about air duct cleaning in the same visit, since dirt can move between the ducts and the coil.

