Air Duct Sanitizing in Simi Valley, CA

Does sanitizing actually fix a smelly duct system?

Only if the dust comes out first. An antimicrobial fogged over loaded supply boots just coats the debris. Sanitizing is the last step, not the service. In Simi Valley attics, most branch runs are flex. The inner liner tears at the collars after decades of attic heat cycling. Spray that torn liner and you wet exposed insulation fiber. That smells worse a week later.

Odor usually starts at the coil, not the branches. Marine layer mornings sweat uninsulated return plenums. Dust sticks to wet metal. Mold follows at the coil face and drain pan, so we look there before touching a register. A flashlight at the return filter rack tells you a lot. Gray felt on the rack edge means the single central return is pulling wall-cavity dust past a loose filter.

Rodent and bird nesting is a different job. Hillside and semi-rural attics get entry at damaged boots. Contaminated sections get removed, not treated. Sanitizing nesting debris in place is not a repair.

Remodel dust loads systems fast across this housing stock. Drywall sanding travels everywhere through an unfiltered return. If your ducts just got loaded that way, mechanical cleaning handles it. Sanitizing adds nothing. We will say so.