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.
Before
After
Before
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Before
AfterAir Duct Cleaning Company in Foster City, CA
Air duct cleaning in Foster City runs $350 – $650 for a typical single-system home, with most jobs scheduled within a few days and completed in three to five hours. What makes Foster City different from other Peninsula cities is the ground beneath the slab: this was marshland until the 1960s, and the engineered fill still holds moisture that migrates into duct systems. We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our crews serve Foster City from the San Francisco Bay Area office. Call (361) 326-5060 for a written estimate before any work starts.
Why Foster City Homes Are Different
Foster City sits on reclaimed land at the edge of San Francisco Bay, and that history is still in the walls. Nearly every home here is a tract house or low-rise condo built between 1960 and 1990 on slab-on-grade foundations with original rigid metal ductwork now 35 to 60 years old. The marine layer keeps humidity high year-round, while the mild summers mean air conditioning runs lightly if at all. That combination lets mold and mildew colonize duct interiors during the off-season, so our Foster City calls are more often about musty odors and health concerns than about visible dust buildup.
The original furnace closets in hallway alcoves make access tight, and retrofits are common. After wet winters, we see a predictable surge when the first warm spring day hits: homeowners turn on the AC and the whole house smells like the bay mud this neighborhood was built on. Technicians call it “dirty sock syndrome,” and in Foster City it’s a geographic condition, not a maintenance failure.
Our Main Foster City Services
Most Foster City homeowners call us for one of these three jobs, each with its own local conditions and pricing.
Air Duct Cleaning in Foster City
We clean the full supply and return duct network with a Rotobrush rotary brush system and, where accessible, a Nikro negative-air machine to pull loosened debris out of the home. In Foster City, the priority is often microbial contamination from chronic ground moisture rather than ordinary household dust. We inspect with a camera before and after so you see what came out of your 40-year-old metal ducts. Air Duct Cleaning in Foster City
Dryer Vent Cleaning in Foster City
Dryer vent cleaning removes lint buildup from the transition duct, wall run, and exterior cap. Foster City’s condo complexes often have longer horizontal runs through shared walls that sag slightly over time, creating traps where lint collects and drying times stretch past an hour. We clean the full run and check airflow with a meter. Dryer Vent Cleaning in Foster City
Duct Sealing in Foster City
Duct sealing closes leaks in the metal trunk lines and branch takeoffs with mastic and reinforced tape, or with aerosol-based methods where access is limited. Foster City’s original rigid ductwork has decades of thermal expansion stress at the joints, and slab moisture can corroze seams from the outside in. Sealing restores pressure balance and stops conditioned air from escaping into the crawlspace or wall cavities. Duct Sealing in Foster City
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Foster City
We stock parts and filters for Honeywell, Aprilaire, and Guardsman systems commonly found in Foster City’s original and upgraded HVAC installations. Most replacement components are on the van, so a filter swap or media pad change doesn’t require a return trip. our brands
Pricing for Air Duct Cleaning Company in Foster City, CA
| Service | Typical range in Foster City |
|---|---|
| Single-system air duct cleaning (up to 12 vents) | $350 – $650 |
| Single-system air duct cleaning (13 – 20 vents) | $550 – $850 |
| Second HVAC system (condo or duplex) | $250 – $450 |
| Dryer vent cleaning (standard wall run) | $120 – $180 |
| Dryer vent cleaning (long horizontal / rooftop cap) | $180 – $280 |
| Duct sealing (aerosol method, single system) | $1,200 – $2,000 |
| Duct sealing (manual mastic, accessible basement) | $800 – $1,400 |
| Sanitizing treatment (mold/mildew remediation) | $150 – $300 |
| Camera inspection with video record | $75 – $125 |
What pushes Foster City jobs toward the higher end: original metal ductwork with corroded seams requiring extra handling, microbial growth needing sanitizing treatment, and tight furnace-closet access that slows the work. The price we write down before we start is the price you pay. No per-vent add-ons, no equipment charges that appear at the door.
Neighborhoods We Serve in Foster City
We schedule Foster City jobs with routing that keeps drive time short from the Bay Area office. Most appointments are available within two to four business days.
- Metro Center
- The Vantage
- Edgewater Isle
- Brewer Island
- Sea Cloud
Service Area – Cities Near Foster City
Our crews cover the full Peninsula and South Bay from the San Francisco Bay Area office. We also schedule regularly in San Francisco, CA, San Jose, CA, and down to Los Angeles, CA and San Diego, CA through our extended Garrison Partners network.
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 Company in Foster City
No permit is required for standard interior duct cleaning in Foster City. Condo owners in complexes like Edgewater Isle should check with their HOA about exterior vent cap access or shared mechanical room entry, but the work itself is considered routine maintenance. Call (361) 326-5060 and we’ll note any access restrictions when we schedule.
We typically schedule Foster City appointments within two to four business days. Dispatch is coordinated from our Bay Area office, and we route Peninsula jobs together to keep arrival windows reliable. Call (361) 326-5060 for the next available slot.
It’s the combination of Foster City’s slab-on-grade construction, chronic ground moisture from the reclaimed marshland, and light AC use that lets mold colonize duct interiors during the off-season. The first spring warm day blows that odor through the house. A full duct cleaning with sanitizing treatment removes the source, and a camera inspection shows you before and after. Call (361) 326-5060 for a free estimate.
What happens when you call
- 1A real person answersNo phone trees - talk to a local air duct cleaning pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Foster City Customers Say
"Dryer vent was packed with lint and took two hours to dry a load. Cleaned it out from the roof cap down. One cycle again."
- Paula Q."No sales pitch. Told me which parts of the system were fine and only cleaned what needed it."
- Ted L."They checked each section with a camera and showed me the dust before and after. Thorough and honest."
- Nicole H.