Metal ductwork running through a home, insulated and sealed at the joints

Same-day air duct service in Foster City, CA

Air Duct Servicesin Foster City, CA

After a smoky summer, San Mateo County homes can hold onto the smell long after the air outside clears - because the ductwork stored the fine particles and keeps recirculating them. A trunk-first cleaning removes the reservoir the smoke settled into.

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Air Duct Service Co — Foster City, CA

Every air duct service, one Foster City call

The six services Foster City homeowners call us for most - from clearing smoke residue out of a trunk to sealing an attic system end to end. Everything on this page is air duct in Foster City, CA — the work, the local conditions and the coverage.

Technician feeding an air whip into a floor vent in a home living room

Cleaning & Care Air Duct Cleaning

Our negative-air machine seals onto the main trunk duct and puts the whole system under suction first. Then each run is scrubbed individually, so years of dust and debris travel one way only — out of the ducts and into the machine. The visit also covers the returns, where a year of rotating pollen seasons mats together. The crews behind air duct cleaning in Foster City, CA are the same ones who cover the ZIP codes listed below.

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Technician inspecting a ceiling return vent with a flashlight inside a home

Cleaning & Care Air Duct Inspection

For a Foster City home you just bought, the inspection shows the condition of the one system nobody ever shows buyers. A camera goes inside your ductwork so you can see exactly what's in there — buildup, damage or blockages — before we recommend anything. Inspections are free. That local standard is what air duct inspection in Foster City, CA means with Air Duct Service Co.

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Technician joining a duct section back together in a home attic

Repair Air Duct Repair

Crushed, torn or disconnected ducts leak the air you pay to heat and cool. We repair and rebuild damaged sections so airflow is strong and even again. Booking air duct repair in Foster City, CA takes one call, and the tech arrives with everything the job needs.

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Technician connecting a new flex duct to the furnace inside a home

Install & Replace Air Duct Installation

New duct runs for additions, remodels and system upgrades — sized, sealed and balanced so every room gets its share of heating and cooling. In Foster City, ADUs and garage conversions get ductwork sized for the space, not tied in as an afterthought. When neighbors talk about air duct installation in Foster City, CA, this is the visit they mean.

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Technician brushing mastic sealant onto a duct joint in a home attic

Repair Air Duct Sealing

Leaky joints quietly waste a big share of your airflow. We seal seams and connections with professional mastic for a tighter, more efficient system. In San Mateo County, a sealed system also keeps smoke-season air where it belongs - inside, filtered, instead of leaking at every joint. Air Duct Sealing in Foster City, CA runs on one standard: done properly, checked, and shown to you before we leave.

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Two technicians cleaning the ductwork in a home with a professional duct machine

Cleaning & Care Commercial Air Duct Cleaning

Offices, restaurants, retail and multi-unit buildings across Foster City — scheduled commercial duct cleaning with the same negative-air machine sealed onto the trunk, keeping your space comfortable, compliant and breathing clean. In Foster City, we schedule around business hours, so restaurants, offices and retail spaces stay open while the work happens. When neighbors talk about commercial air duct cleaning in Foster City, CA, this is the visit they mean.

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Need something else — a damper, a blower, a smoke problem, a bird in the flue? We cover all 27 air duct specialties. Call (888) 258-5005 and describe it.

Local conditions

Foster City ducts have Foster City problems

A duct system in Foster City may face wildfire smoke, valley heat, coastal moisture or all three across the year. This is what we actually find here, and what we check on every visit.

The smell that outlasts the smoke

Owners across San Mateo County notice it every year: weeks after a smoke event, the AC or heat still carries a faint campfire note at startup. That is smoke residue stored in duct dust, releasing a little with every cycle. Cleaning the reservoir is what ends it.

Inland heat bakes attic systems

Inland Foster City summers push attics to extremes, and the ductwork living there ages fast - tape dries, flex jackets get brittle, joints separate. Cooled air leaks overhead while the system runs long afternoons, and sealing is usually where the fix starts.

Open-window seasons load the system

California's mild months are open-window months, and everything outside - pollen, road dust, construction grit - comes in and a share of it settles into the returns. By the time the house closes up for summer heat or winter rain, the system has stored a season of it.

Crawlspace systems on older lots

Raised-foundation homes around Foster City run ducts through crawlspaces that stay cool and damp. Insulation sags, joints sweat and dust inside the runs sits in moisture - the musty startup smell in these homes is a crawlspace duct story more often than not.

Foster City sits in San Mateo County, and the ZIP list at the bottom of this page covers 1 serviceable ZIP codes — 94404 through 94404. The closest served neighbors are San Mateo, Belmont, San Carlos, and every one of them is covered by the same crews, the same day, under the same number: (888) 258-5005.

Cold air duct? Warm answer.

Same-day service, free estimates, licensed & insured — and a air duct that lights when you click the remote.

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How it works

How it works in Foster City, CA

Every Foster City visit runs the same way — booked in one call, checked inside the ducts, and finished with the before-and-after shown to you, not just described.

1. You call, we book

Call (888) 258-5005 and tell us what the house is telling you — dust that comes back within days, rooms that never quite cool, airflow that feels weak. We book a local Foster City tech, same day whenever a slot is open.

2. Free duct inspection

The visit starts with a look inside the ductwork — at the registers and at the main trunk — so the diagnosis is something you can see for yourself, and the inspection is free.

3. The work itself

A negative-air machine seals onto the main trunk and pulls debris out under vacuum while each register is cleaned in turn, so the dust leaves through the machine — not into your Foster City home.

4. Before and after, shown

You see inside the ducts before we start and after we finish, and any work beyond the cleaning is priced and agreed before it begins. Estimates are always free.

Reviews

Foster City reviews

5 stars — based on 100+ reviews. Foster City homeowners rate Air Duct Service Co five stars across Google and Facebook, and they mention the same things: the free inspection, the sealed negative-air setup that keeps the dust out of the house, and ducts they could see before and after. Call (888) 258-5005 and put us to the same test.

Questions

Asked the way Foster City asks

The smoke is gone but my house still smells like it - why?

Because the ductwork kept it. Fine smoke particles settled into the dust inside your trunk and returns during the event, and every cycle since has released a little back into the rooms. In Foster City, a cleaning from the main trunk out removes that stored residue, and the startup smell goes with it.

How often should ducts be cleaned in California?

Every few years for most Foster City homes - sooner after a heavy smoke season, a remodel, or in allergy households. Coastal and inland systems age differently, so we camera-inspect free and show you your own trunk; the right interval comes from what is actually in there.

Why does one room never cool like the rest?

Usually the run serving it: a separated attic joint, a kinked flex run, or a conversion room tied into an undersized trunk. In Foster City we trace the run on the inspection camera, and repair, sealing or a properly sized new run fixes it at the cause.

Will sealing ducts help my energy use?

In inland Foster City homes with attic systems, leaks spill cooled air into a hot attic on every cycle, and sealing them means the equipment runs less to hold temperature. We leak-check on every inspection and tell you plainly which work would actually pay off.

Do you offer same-day air duct service in Foster City?

Yes - same-day service is available in Foster City, along with free inspections and estimates before any work starts. We are licensed and insured, with 10+ years of experience and 100+ 5-star reviews. Call early in the day for the best chance of a same-day visit.

Do you give prices over the phone?

No — and be wary of anyone who does. Every duct system is a different size and condition, so a phone price is a guess that changes at your door. Our inspections and estimates are free: a tech looks inside your actual ductwork first, then gives you one clear price before any work starts.

Where we work

Foster City, CA ZIP codes we serve

Air Duct Service Co is a national company with local technicians serving Foster City street addresses across the ZIP codes below — same-day service and free estimates, every day 8 AM – 8 PM. More of California is covered from our California page. The Foster City list below covers 1 ZIP codes, 94404 through 94404.

94404

Don't see your ZIP? Foster City also uses P.O. Box and single-organization ZIP codes that have no street addresses — call (888) 258-5005 and we will confirm coverage for your street address on the call.

Also serving nearby: San Mateo, CA · Belmont, CA · San Carlos, CA · Burlingame, CA · Hillsborough, CA · Redwood City, CA.