Air Duct Sanitizing in Orlando, FL

Does sanitizing actually do anything after the ducts are cleaned?

Only if the dust comes out first. Antimicrobial fog lands on whatever surface it touches. Coat settled debris and you treat the debris, not the duct. So negative-pressure source removal runs first. Boots and registers get wiped by hand. So does the plenum. Then treatment goes on bare metal or sound liner.

Ask what product is being sprayed. It should be EPA-registered. The label should name HVAC or duct surfaces specifically. Read it yourself. The label also lists the re-entry time. It says whether pets need to move out. Same for fish tanks or birds. Anyone who won't show you the jug is a problem.

Porous surfaces are the hard part. Pre-1970 rigid metal with internal fiberglass liner absorbs rather than wipes. If that liner sheds fragments, sanitizing it is a stall. Replacement or encapsulation is the honest answer.

Odor that returns within weeks means water, not microbes. Around Orlando that is usually sweating boots and collars. Or flex sagging into low spots between trusses. Or a return chase pulling humid attic air through unsealed framing. Sealing and insulation repair goes in at the same visit. Dry duct stays clean. Wet duct re-colonizes no matter what was sprayed in it.