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 HVAC Cleaning Across San Mateo
HVAC cleaning in San Mateo typically costs between $425 and $810 for a full system, and the single biggest driver inside those ducts is usually moisture, not dust. Our crews work the same flatland neighborhoods you do: Baywood, Beresford Manor, Fiesta Gardens, Shoreview. We know what the marine layer does to a 1950s duct system in San Mateo. Call (806) 606-6902 and you’ll get a written price before any work starts, every time.
Why CleanRun Air Duct Cleaning Is San Mateo’s Preferred HVAC Cleaning Company
CleanRun has been documenting every job since 2013: written price first, photo record after. That matters in San Mateo because the highest-value work we do here is HVAC Cleaning that addresses the damp-idle cycle, not just the dust layer. A lot of crews will fog the plenum and call it a day. We photograph the inside of every duct run before and after so you can see what actually came out and what stayed behind. That record is yours to keep.
Every San Mateo job runs under the H.A.V.E.N. Standard. Haven Standard Clause 4: Documented Results. The camera goes in before we decide anything. The camera comes back out after. No narrative, just footage. Tomas Reyes, who runs CleanRun, built the standard around a simple idea: if a company won’t show you the inside of your own ducts, you don’t know what you paid for.
Our San Mateo calls are answered by a live person, and the technician who shows up is background-checked, uniformed, and named before arrival. No dispatch mysteries.
Our HVAC Cleaning Services in San Mateo
Every system has four points where San Mateo’s humidity collects and causes trouble: the evaporator coil, the blower assembly, the air handler cabinet, and the condenser outside. We clean all four and document each with photographs.
Evaporator Coil Cleaning
A dusty evaporator coil is a wet evaporator coil in San Mateo. The coil sits on the supply side and chills the air; when it’s caked with a biofilm from months of moist idle cycling, airflow drops and the system has to work harder. We clean coils with a combination of mechanical agitation and a coil-safe treatment that breaks down the microbial layer without leaving a residue that re-wets in the marine air. Typical San Mateo coil cleaning runs $145 to $260 as part of a full system clean.
Air Handler Cleaning
The air handler is the cabinet that houses the blower and coil, and in San Mateo it’s often located in the garage or a low-clearance crawl space where humidity pools. We remove the blower assembly, vacuum the cabinet interior, and clean the blower wheel fins with a non-corrosive cleaner. Beresford Manor homes with original 1960s handlers commonly have fiberglass duct board fragments collected inside the cabinet. We photograph that before and after so you can see the difference.
Blower Cleaning
A dirty blower wheel throws dust into every register. In San Mateo’s damp air, that dust becomes sticky, cakes onto the wheel’s forward-curved fins, and reduces static pressure through the whole system. We pull the blower, photograph it, clean each fin, and reinstall. Blower cleaning usually runs $110 to $180 when performed with a full system clean.
Condenser Cleaning
The condenser is the outdoor unit, and in San Mateo it sits in fog most mornings. The coil picks up salt air, eucalyptus debris, and dirt from the yard. We clean the condenser coil and check the fan motor and fins. A San Mateo condenser cleaning typically runs $120 to $190 as part of a full system service.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in San Mateo
We service and clean systems built around Honeywell, Aprilaire, and Guardsman components, and we carry the tools to match: Rotobrush negative-pressure extraction, Nikro HEPA filtration, and Abatement Technologies containment equipment where needed. Aprilaire humidifiers and Honeywell media filters are common in San Mateo homes because people here understand humidity management; when we clean a system with those components, we clean them to manufacturer service intervals, not a generic one-size-fits-all checklist. We stock common filter and coil treatment supplies on our trucks so San Mateo jobs don’t get stretched over multiple visits.
Common HVAC Cleaning Problems We See in San Mateo Homes
- Mold on evaporator coils and in the air handler cabinet. The marine layer keeps coil surfaces damp for months at a stretch, and a coil that never fully dries grows a biofilm that ordinary vacuuming can’t remove. We treat the coil and cabinet, then photograph the result.
- Delaminated duct board in pre-1980 flatland homes. Baywood, Beresford, and Fiesta Gardens houses built before 1980 often have fiberglass duct board with a liner that has separated from the substrate after 50 years of crawl-space moisture. Cleaning that surface only makes it worse; replacement is the honest answer.
- Dust and debris disturbed by peninsula renovation wave. Remodels in San Carlos and Belmont drift dust and gypsum into San Mateo systems through open returns. That fine dust compacts in duct runs and needs negative-pressure extraction, not a shop vac.
- Musty smell on first heat cycle. San Mateo systems idle for months without airflow, then fire up in late fall. The first heat cycle burns off whatever grew in that damp stillness, and that’s the smell. Coil treatment and air handler cleaning address the source.
Pricing for HVAC Cleaning in San Mateo, CA
A full HVAC cleaning in San Mateo for a typical 1,800-square-foot home runs between $425 and $810, depending on system configuration and access. Add evaporator coil treatment and you’re usually in the $570 to $890 range. Condenser-only cleaning starts around $120. The variables: number of duct runs, crawl-space access difficulty, whether duct board needs replacement rather than cleaning, and whether your system has a second return. We write all of this down before work begins.
Here’s the difference with CleanRun on this specific point: Haven Standard Clause 1 says written price before any panel comes off. Not an estimate, not a range with fine print. A number. If the camera shows something unexpected mid-job, we stop, show you the footage, and write a new number before proceeding. No surprise invoices.
Call (806) 606-6902 for an exact written quote. Estimates are free, and we’ll put our number next to any competitor’s written estimate.
We Also Serve Cities Near San Mateo
Our crews handle HVAC cleaning throughout the mid-Peninsula, including Burlingame, Belmont, Millbrae, and San Carlos. Same H.A.V.E.N. Standard, same written pricing, same documented photo record. If you’re in a neighboring city and want the CleanRun approach, call the same number: (806) 606-6902.
Serving San Mateo, CA - Our Local Coverage Area
We’re based in the San Mateo 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 - HVAC Cleaning in San Mateo
Mold returns fast in San Mateo because the marine layer keeps crawl-space and attic humidity between 55% and 75% for most of the year, and systems run too little to dry out between cleanings. If the mold source isn’t physically removed from the coil and cabinet surfaces, the humid idle cycle reactivates it within weeks. That’s why CleanRun treats surfaces mechanically, not with a fogging product, and documents the result with photos.
If a camera inspection shows the duct board liner has delaminated from the substrate or is actively shedding fibers into the airstream, that system should be replaced, not cleaned. In 1950s and 1960s Baywood ranchers, especially those with original duct board in low-clearance crawl spaces, this is common. We pulled the supply and return ducts in a 1958 Beresford Manor rancher where the liner had separated and was blowing fiberglass into the registers. After camera inspection confirmed the delamination, we converted the job from a cleaning to a replacement, then cleaned the new rigid metal runs to NADCA standards with negative pressure and HEPA filtration before rebalancing the registers. You can’t clean structural failure. Call (806) 606-6902 and we’ll put a camera in before anyone touches a brush.
No. Fogging sanitizers reach exposed surfaces and leave a temporary chemical residue, but they don’t remove the mold root or the damp liner it’s feeding on. In San Mateo’s humid crawl spaces, the mold regrows within weeks because the moisture source is still there. Source removal is the only approach that holds. Avoid any company that offers “fogging” as the whole solution; if they won’t put a camera in before and after, the fog is theater.
What you’re seeing is condensation from San Mateo’s morning marine layer settling in your duct runs. Ducts running through low-clearance crawl spaces in Baywood, Beresford Manor, and Fiesta Gardens pick up that humidity and hold it because the system doesn’t run long enough to dry out. The moisture you’re finding is ambient, not from a leak. We can verify this with a camera and a psychrometer, then clean the damp surfaces and recommend whether duct insulation or sealing would help stop the cycle.
Yes, in most cases. That smell is microbial growth burning off after a long idle period in San Mateo’s humid air. Cleaning the evaporator coil, air handler cabinet, and blower assembly removes the source, and a coil treatment slows regrowth. For a lasting fix in San Mateo, the coil and cabinet are the two surfaces that matter most. Call (806) 606-6902 and we’ll show you the before and after footage before you decide anything.
Call CleanRun for HVAC Cleaning in San Mateo
If your ducts are damp, musty, or shedding fibers into your supply registers, call (806) 606-6902. We’ll book a camera inspection, write you a price before any work starts, and hand you a photo record of every duct run when we finish. That’s the CleanRun standard. No fogging theater. No surprise invoices. Just documented work, backed by the 365-Day Done Right Promise and the H.A.V.E.N. Standard.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning, serving San Mateo since 2013.
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