Air Duct Cleaning in San Mateo, CA

Frequently Asked Questions

1. My house in Baywood still has the old gravity furnace trunk in the crawlspace. Can you clean that?

   Sometimes, and sometimes we shouldn't touch it. A lot of the 1910s–1930s raised-foundation homes in San Mateo Park, Baywood and Aragon were converted from gravity systems, and the original oversized trunk is often left in place (occasionally still wrapped in asbestos-containing insulation). If we see suspect wrap, we stop and tell you; that's abatement work, not duct cleaning. Where the old trunk was abandoned and a new system runs alongside it, we clean the live ducts and leave the dead one alone. The other limit is access: these crawlspaces are tight, and panned-joist returns (floor joists used as return cavities, with no sheet metal at all) can't be brush-cleaned the way a round duct can. We'll tell you which of your returns are panned before we quote anything.

2. We're in Shoreview on a slab and the ducts are up in the attic. Is that an easier job?

   Usually yes, with one caveat. The 1945–1960 flats tracts, Shoreview, Sunnybrae, Fiesta Gardens, North Shoreview, put the whole duct run in a low attic, so we can reach most of the system from above rather than crawling under the house. The caveat is headroom. Those attics are shallow at the eaves, and if the branches to the perimeter rooms are buried in blown insulation we work slower and sometimes have to open an access point. The other thing we find in those houses is a mix: some original galvanized sheet metal, some flex added over the years by different contractors. Old flex that's crushed, kinked or hanging in a low spot doesn't clean so much as it needs replacing, and we'll say so instead of pretending a brush fixed it.

3. What actually goes wrong with ducts in San Mateo?

   A few things, over and over. Moisture in the flats: the filled bay margin keeps the water table high, so subfloor and slab-edge areas stay damp and anything metal down there corrodes faster than it should. Loading from outside: street-tree and hill-oak pollen in spring, plus fine bay-edge silt, which is what fills most filters we pull here. And disuse. The San Bruno Gap fog keeps summer cooling demand short, so a lot of systems sit idle for months and then get asked to run hard from October through April. Dust that settled all summer gets pushed through the house the first cold week. The other recurring issue is disconnected flex in attics, which heats the attic instead of the bedroom and is easy to miss until a room never warms up.

4. I'm in a condo off Hillsdale with a shared riser. Does duct cleaning even apply?

   Partly. In the denser El Camino and Hillsdale corridor buildings, your in-unit ducts and the equipment serving your unit are yours; the vertical risers and shared shafts usually belong to the building and are the HOA's or property manager's call. We can clean what's inside your unit and document what we see at the connection point, but we won't open a shared shaft without written authorization from whoever runs the building. If your complaint is odors or dust coming from a neighbor's unit, that's almost always a riser or shaft issue, and cleaning your own branches won't solve it. Tell us the building setup when you call and we'll say upfront whether the visit is worth your money.