Coil Cleaning in Tampa, FL

What actually fouls coils in Tampa houses

Go outside and look above a window. Most Florida installs have a PVC stub there. That is the secondary drain line. If it drips, the primary is blocked and the pan is already full. A rust-colored stain under that stub means it happened before. Homeowners usually read that stain as a roof leak. It isn't.

The mat never forms where you can see it. It packs onto the entry face of the A-coil, up inside the plenum. Opening the service door shows you the clean side. Plenty of Tampa plenums are fiberglass ductboard, not sheet metal. Access there means a knife cut, then mastic to close it. Peeling foil tape on a plenum is evidence of a rushed prior cleaning.

Access depends on the era of the house. Block ranches around Seminole Heights hide a vertical handler in a hall closet. Later subdivisions laid horizontal units flat in the attic. Horizontal coils drain lazily and silt their pans. Loose return boots up there inhale blown insulation year round.

Chemistry matters more than water pressure. Acidic cleaners chew aluminum, and all-aluminum coils are now common. We use a foaming alkaline product, then a gentle rinse, then flush the pan. If the coil already has pinhole formicary corrosion, cleaning buys you nothing. We will say so rather than wash a leaking coil.