Inside a home air duct showing dust and debris buildup before cleaning

Same-day air duct service in San Mateo, CA

Air Duct Servicesin San Mateo, CA

San Mateo homes were built across a century of styles, and their duct systems range from original metal in older neighborhoods to flex in attic retrofits. Our negative-air machine seals onto the main trunk and puts the whole system under suction first, then every run is scrubbed individually.

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Air Duct Service Co — San Mateo, CA

Every air duct service, one San Mateo call

From an older home with original ductwork to a sealed inland house that ran through smoke season, these are the six duct services San Mateo homeowners book with us. Below is air duct in San Mateo, CA in full — every service, the local conditions and the areas covered.

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. In San Mateo County, open-window months load systems steadily, and every run gets scrubbed along its full length. Air Duct Cleaning in San Mateo, CA starts with a real look at the problem — never a guess over the phone.

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

Cleaning & Care Air Duct Inspection

In San Mateo, the camera pays closest attention to attic joints, where heat and small tremors loosen connections over the years. 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. For air duct inspection in San Mateo, CA, one call books the visit and a local tech takes it from there.

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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. Air Duct Repair in San Mateo, CA starts with a real look at the problem — never a guess over the phone.

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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 San Mateo County, attic installs are routed and strapped to avoid the sags and kinks that choke older systems here. When neighbors talk about air duct installation in San Mateo, 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, sealing attic runs stops cooled air from spilling into the hottest space in the house. Booking air duct sealing in San Mateo, CA takes one call, and the tech arrives with everything the job needs.

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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 San Mateo — scheduled commercial duct cleaning with the same negative-air machine sealed onto the trunk, keeping your space comfortable, compliant and breathing clean. Around San Mateo, multi-unit buildings get a unit-by-unit plan, with each system cleaned from its own trunk. That local standard is what commercial air duct cleaning in San Mateo, CA means with Air Duct Service Co.

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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

San Mateo ducts have San Mateo problems

A duct system in San Mateo 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.

Pollen nearly all year

With something blooming in California in almost every month, pollen is not a season here so much as a rotation - trees, grasses, weeds in turn. Return ducts collect each wave, and allergy households feel the stored load most when the house is sealed tight.

Earthquake country shakes joints loose

Small tremors are a fact of life in San Mateo, and duct joints in attics and crawlspaces shift a little with each one. Over years, takeoffs loosen and seams open. A comfort problem with no obvious cause is worth a camera look at the connections overhead.

ADUs, conversions and additions

Garage conversions and accessory units are going up across San Mateo, and their ductwork is often the last thing planned - tied into a trunk that was never sized for another room. Those spaces stay uncomfortable until the run is installed, sealed and balanced properly.

San Mateo sits in San Mateo County, and the ZIP list at the bottom of this page covers 4 serviceable ZIP codes — 94401 through 94404. The closest served neighbors are Foster City, Belmont, Burlingame, 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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Questions

Asked the way San Mateo 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 San Mateo, 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 San Mateo 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.

How do you clean the ducts - what is the process?

Our negative-air machine seals onto the main trunk duct and puts the whole system under suction first. Then each individual run is scrubbed on its own, so loosened dust and smoke residue travel toward the trunk and into the machine - never back into your rooms. We finish at the registers and show you the before-and-after on camera.

What are the signs my ducts are leaking?

Rooms that lag the thermostat, long AC cycles on ordinary days, dust returning soon after cleaning and weak airflow at distant registers. In attic systems across San Mateo, heat-dried tape and shifted joints are the standing culprits, and mastic sealing is the lasting fix.

Do you clean ducts in commercial buildings here?

Yes - offices, restaurants, retail, medical suites and multi-unit buildings across San Mateo, scheduled around your hours. Commercial systems get the same method: the negative-air machine sealed onto the trunk, every run cleaned individually, and a camera record of condition.

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

San Mateo, CA ZIP codes we serve

Air Duct Service Co is a national company with local technicians serving San Mateo 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 San Mateo list below covers 4 ZIP codes, 94401 through 94404.

94401 94402 94403 94404

Don't see your ZIP? San Mateo 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: Foster City, CA · Belmont, CA · Burlingame, CA · Hillsborough, CA · San Carlos, CA · Millbrae, CA.