Air Duct Sanitizing in Los Angeles, CA

Does sanitizing actually fix a smelly duct system?

Only if the source is gone first. Sanitizer sprayed over rodent nesting in flex duct does nothing. The nest comes out, the contaminated liner section gets replaced, then treatment goes on clean metal. Same with a secondary pan that overflowed under an attic air handler. Wet fiberglass ductboard holds odor permanently. It is cut out, not sprayed.

What we treat and what we refuse differs by material. Bare galvanized trunk from the 1950s and 60s takes an antimicrobial fog well. Interior duct liner and ductboard soak it up and stay damp. Flex duct inner core is thin and tears under an agitating brush. On older joints we look for grey or black tape before any tool goes in. Asbestos-containing tape means we stop and refer out.

Check your own returns first. A single hallway grille serving the whole house pulls dust past the filter edges at high velocity. That grit lands in supply runs and no sanitizing keeps it out. Fine ash after Santa Ana fire events behaves the same way.

Coastal homes near the water have a separate problem. Damp salt air condenses on uninsulated plenums and cold boots. Rust at the seams feeds growth back. Insulation and sealing matter more than chemicals there.