Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Air Duct Cleaning Across Foster City
Air duct cleaning in Foster City typically runs $350 – $650 for a full residential system, and most jobs are completed in a single visit. If your home was built between 1960 and 1990 on Foster City’s engineered fill, your original rigid metal ducts are likely 35 – 60 years old and may be harboring moisture-driven microbial growth that standard dust removal won’t touch.
We’re the Air Duct Cleaning crew that serves Foster City from our San Francisco Bay Area dispatch office, and we know this city’s housing stock inside out. From the slab-on-grade ranches near Beach Park Boulevard to the low-rise condos along Edgewater Boulevard, we’ve cleaned ducts in the tight furnace closets and original metal trunk lines that define Foster City’s tract-home neighborhoods. Our technicians arrive uniformed, background-checked, and equipped with Rotobrush rotary systems and Nikro negative-air machines – the same tools commercial crews use, not hardware-store rentals. Call (361) 326-5060 for a free written estimate.
Why Hollis Air Duct Cleaning Is Foster City’s Preferred Air Duct Cleaning Company
Hollis has been part of the Garrison Partners family since 2004. That’s a track record that predates most competitors you’ll find bidding on Foster City jobs today. We don’t compete on teaser coupons; we compete on discipline – written prices, written guarantees, and a 365-Day Done Right Promise that competitors rarely match in writing.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday when your AC just started pumping musty air through the house.
Every technician follows The Garrison Code: arrive inside the quoted window, price in writing before touching equipment, complete the job by the book, and leave the site clean. In Foster City, that standard matters more than usual – because the moisture problems here are specific, and sloppy work just aerosolizes mold spores through your living space without solving anything.
We serve Foster City with crews dispatched from our Bay Area office, not subcontractors from three counties away. That matters for response time and accountability.
Residential Air Duct Cleaning in Foster City
Residential Air Duct Cleaning in Foster City means source removal from rigid metal supply and return ducts, trunk lines, and branch runs in homes built on reclaimed marshland between 1960 and 1990. The job is not primarily about dust. Foster City’s slab-on-grade construction sits on engineered fill over bay mud, and that chronic ground moisture colonizes duct interiors with mold and mildew during the mild, damp off-season. When homeowners first fire up the AC in April or May, the system pulls that musty biofilm into every room. A genuine residential cleaning removes the source, not the smell.
For a typical Foster City single-family home, residential duct cleaning runs $350 – $550. Larger homes with extended trunk lines, or properties needing video inspection and sealing, can reach $650. We price per system, not per vent, and the written quote is fixed before work starts.
Supply and Return Duct Cleaning
Supply ducts push conditioned air into your rooms; return ducts pull air back to the handler. In Foster City’s original tract homes, both are rigid galvanized steel, often with fiberglass liner that traps moisture. We clean both directions with rotary agitation and negative-air capture so dislodged material exits through our HEPA filtration, not your registers.
Full System Cleaning with Video Inspection
After wet winters, we recommend camera inspection of the main trunk. The video shows you what the technician sees – damp biofilm, standing water at low points, or rust at slab penetrations. It’s the difference between guessing and knowing whether your ducts need cleaning or replacement.
Commercial Air Duct Cleaning in Foster City
Commercial Air Duct Cleaning in Foster City covers the low-rise office buildings, medical suites, and retail spaces along Metro Center Boulevard and the waterfront commercial corridors near the lagoon. These properties share the same marshland foundation issues as residential neighborhoods, but with larger rooftop units and extended duct networks that compound moisture problems. Foster City’s marine layer keeps commercial crawlspaces and plenum areas damp year-round, and light summer AC use means systems sit idle while microbial growth spreads.
Commercial duct cleaning in Foster City typically ranges from $800 for small office suites up to $2,500 for multi-unit buildings with rooftop handlers and extensive branch runs. We price after site inspection, with a written scope and fixed total before any work begins.
Multi-Unit and Property Management Cleaning
Condo associations and commercial landlords in Foster City need scheduled cleaning that doesn’t disrupt tenants. We coordinate access, work within HOA rules, and provide before-and-after documentation for property records. Every unit gets the same standard: negative pressure, HEPA filtration, written completion report.
Rooftop Unit and Plenum Service
Commercial RTUs in Foster City pull humid bay air through damp intakes. We clean the unit cabinet, blower assembly, and connecting plenum as part of full-system service, not as a separate upsell. The plenum is where moisture first condenses; skipping it leaves the problem intact.
Trusted Brands We Service in Foster City
Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation inside rigid metal ducts, Nikro negative-air machines for controlled debris extraction, and filtration products from Honeywell, Aprilaire, and Guardsman. We don’t use hardware-store shop vacs or fogging chemicals that mask odors without removing source contamination. For Foster City’s moisture-driven problems, that distinction matters. We stock common replacement filters and media locally, so if your system needs new filtration after cleaning, we can install it same visit rather than ordering for a return trip.
Common Air Duct Cleaning Problems We See in Foster City Homes
- “Dirty sock syndrome” after the first spring AC cycle. We get clusters of calls every April from homes near Beach Park Boulevard and Edgewater Boulevard. The odor isn’t dust; it’s biofilm in damp ducts activated by airflow. Fogging sanitiser masks it for two weeks.
- Original fiberglass-lined ductwork holding moisture at slab penetrations. Foster City’s 1960s – 1980s tract homes used fiberglass board inside metal trunks. That liner degrades, traps water, and becomes a mold substrate. Cleaning removes surface growth; replacement is needed if the liner is breaking down.
- Negative pressure skipped by low-bid contractors. Without a contained vacuum source, agitation just blows spores into your living space. We see this after other companies leave Foster City homes smelling worse than before.
- Condensate pans and drain lines clogged from off-season inactivity. Foster City’s mild summers mean AC runs lightly. Standing water in pans breeds bacteria that enter the airstream. We inspect and clear as part of full-system cleaning.
Pricing for Air Duct Cleaning in Foster City, CA
A typical residential duct cleaning in Foster City runs $350 – $550 for a complete supply-and-return system. Larger homes or those needing video inspection and sealing reach $650. Commercial properties start around $800 and scale with system size.
What moves the price: square footage, number of branch runs, accessibility of the furnace closet (many Foster City hallway closets are tight), condition of original ductwork, and whether video inspection or sealing is added. We do not quote per vent. One flat price per system, agreed in writing, before any work starts.
We also do not sell fogging “sanitiser” upsells. If a contractor quotes $99 and then pushes $400 in chemicals at your door, that’s not air duct cleaning. Call (361) 326-5060 for a free written estimate with no obligation.
We Also Serve Cities Near Foster City
Our Bay Area crews also handle jobs in Los Angeles, San Diego, San Jose, and San Francisco. Scheduling and dispatch are coordinated from our San Francisco Bay Area office, with local technicians serving each metro area.
Serving Foster City, CA - Our Local Coverage Area
We’re based in the Foster City area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Air Duct Cleaning in Foster City
Your slab-on-grade home sits on engineered fill over reclaimed marshland, and chronic ground moisture has colonized your duct interiors with mold and mildew biofilm during the damp off-season. When you first run the AC in April or May, airflow reactivates that microbial growth and distributes the odor through every register. A genuine source-removal cleaning with negative pressure and HEPA filtration removes the biofilm; a fogging sanitiser only masks it for a few weeks. Call (361) 326-5060 for an inspection.
Yes. Neighboring Peninsula cities on bedrock or raised foundations don’t face the chronic slab-perimeter moisture that Foster City’s reclaimed marshland creates. Here, duct cleaning is primarily a microbial-source-removal job, not a dust-removal job. The equipment and technique are different – negative pressure and HEPA capture are essential, not optional. We see the seasonal “dirty sock syndrome” pattern almost exclusively in Foster City and similar fill-built communities.
Genuine cleaning includes mechanical agitation with rotary brushes, negative-air extraction with HEPA filtration, and camera verification of the main trunk. It should address supply and return ducts, the plenum, and accessible blower components. Upsells to reject: fogging “sanitisers” that don’t remove source contamination, per-vent pricing that balloons at the door, and ozone treatments with no proven efficacy for mold. Hollis provides one flat system price in writing before work starts. Call (361) 326-5060 for a quote that won’t change.
Video inspection is the only reliable method. If the rigid metal shell is intact with surface biofilm, cleaning restores function. If the internal fiberglass liner is degrading, crumbling, or saturated with moisture, replacement is necessary – cleaning damaged liner just distributes particles. Rust at slab penetrations or standing water in low trunk lines also indicates replacement needs. We show you the camera footage and explain what we’re seeing before recommending either option.
Yes. Low-rise condos in Foster City typically share the same rigid metal duct systems as single-family homes, just with shorter runs and centralized mechanical rooms. We adapt our negative-air setup to multi-unit access points and coordinate with HOA requirements. The same standard applies: rotary agitation, HEPA-contained extraction, written completion report. Pricing for typical low-rise units runs $300 – $450 depending on system configuration. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Foster City since 2004.