Question 1

My ducts run through the attic and there's no crawlspace, how do you actually reach them?

Accepted Answer

That's the standard setup here, since the whole city was built on fill from the mid-1960s on with slab-on-grade floors and no crawlspaces. Access is from the attic hatch and from the registers and returns inside the house. We pull supply and return boots, run the vacuum and agitation line from the air handler side, and work the branches out from the plenum. In the earliest phases you'll usually find original sheet metal trunk and branch runs; later phases are insulated flex. Both clean, but flex needs a gentler hand so the inner liner doesn't tear away from the collars.

Question 2

Why do my supply registers look damp or stained around the edges in summer?

Accepted Answer

That's the most common thing we see in Foster City and it isn't usually a leak. The attic gets hot while the ducts above you carry cool air, and with lagoons and the bay on three sides the ambient moisture is high year-round. Condensation forms at the boot where the flex meets the register and at any connection where insulation has slumped or the vapor barrier is torn. Over time that damp spot collects dust and can go biological. Cleaning handles what's in the duct, but we'll also point out boots that need the insulation re-wrapped or the collar re-sealed. Otherwise it comes right back.

Question 3

What drives the price up or down on a home here?

Accepted Answer

Duct material and system layout matter more than square footage. An early-phase house with original sheet metal is usually straightforward. Later flex systems take longer because every branch gets handled individually and damaged liner has to be identified rather than just blown through. The bigger variable is multifamily: if you're in a townhome or condo with a shared mechanical closet and a vertical riser, the scope depends on what's yours versus the HOA's, and we sort that out before quoting. Adding dryer and bath exhaust runs also changes the number, and in condo stacks those are often the ones that actually need it most.

Question 4

How fast can someone get out here?

Accepted Answer

Foster City is compact and we're on the Peninsula, so scheduling is usually within a few days rather than weeks. Condo and townhome jobs sometimes take a little longer to book because we may need building access or an HOA window for shared closets and risers. If you're calling because a dryer vent is backing up or an exhaust run has stopped pulling, say so when you call. Those move up the list.

Question 5

Do you do same-day work, and is it worth it with all the wind and salt air here?

Accepted Answer

Same-day happens when there's an opening, more often for single-family homes than for condos where we need access arranged. As for whether it matters: the afternoon bay wind carries salt aerosol and fine shoreline silt, and that works into returns and settles in the duct run along with ordinary household dust. It doesn't mean you need cleaning every year, but it does mean filters load faster than they would inland and return grilles grey out quickly. If yours are visibly loaded and the system has never been cleaned, that's a reasonable reason to have it looked at.

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