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AirShield Air Duct Care

Air Duct Mold Removal in San Rafael, CA

Call (415) 223-3423
Air Duct Mold Removal in San Rafael, CA

Air duct mold removal in San Rafael homes

Summer fog sits in Marin crawlspaces long after the street dries. That matters. Many pre-1940 and 1950s-60s homes here run supply trunks through vented, damp crawl space. Cold supply metal plus humid crawl air equals condensation. Wet duct wrap stays wet. The musty smell shows up at startup, then fades, then returns. That pattern is the giveaway.

Real mold removal starts with the water, not the duct. We look for torn flex at the takeoff. Disconnected boots show up too. Returns sometimes pull unconditioned crawl or attic air. Eichler-type homes retrofitted with attic flex have their own version of this in soffit chases. We also check the evaporator coil, the drip pan, and the blower wheel. Coil biofilm smells like duct mold and often is the actual source.

Be careful what gets labeled mold. Rodent nesting and droppings in a crawl trunk can read as "dirty ducts." So can dry-season dust and wildfire smoke residue. Each needs different handling.

Honest limit: the interior liner of old flex and fiberglass duct board is porous. Growth there is not cleanable. It gets cut out and replaced. Sanitizing bare sheet metal works; fogging a soaked liner does not.

Scope follows how much porous material is contaminated and how accessible the runs are.

Same-day air duct mold removal available in San Rafael, CA.

Call (415) 223-3423

What happens after you call us

  1. 1

    Call and tell us how many supply registers you have and where the furnace sits, crawlspace, attic or closet. We book a two hour arrival window and text you the tech's name before he leaves the shop.

  2. 2

    He walks the house first, pulls a register cover, checks the return and the trunk line, then gives you one firm number. Vent count, flex versus sheet metal, and crawlspace access move that price.

  3. 3

    We tape off the registers, run the vacuum under negative pressure, test airflow at every supply, and put the covers back clean. You pay the number you were quoted, nothing added after the fact.