Air Duct Mold Removal in La Mesa, CA

Air duct mold removal in La Mesa homes

Marine-layer mornings do most of the damage here. Cold supply plenums sweat. Condensate wicks into fiberglass liner. In older low-lying areas, slab-level crawlspace runs stay damp long after the fog burns off. That is where growth starts, not in the middle of an attic trunk line.

So the first job is finding the water. We open the plenum, check the coil drain pan, and look at boot connections at register take-offs. Disconnected boots pull attic air into supply ducts. Attic air carries dust and insulation fiber. Wet metal plus that debris equals a food source.

Porous material is the dividing line. Galvanized sheet metal from the 1950s and 60s can be cleaned and dried. Growth inside a 1970s–90s gray flex liner cannot. Those liners crack and shed anyway. That run gets cut out and replaced. Scrubbing it is theater.

On pre-1960 metal plenums you may see paper and tar wrap. We do not disturb that material. It gets left intact and referred out.

A musty odor alone is not proof. Rodent nesting in east-side attic runs smells similar. Dust on a wet coil looks like growth under a flashlight. Ask to see the photo before anyone quotes replacement duct.