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 Foster City
HVAC cleaning in Foster City typically costs $425-$780 for a full-system service on a single-family home, with the work completed in half a day. If you live in a lagoon-fronting home, expect the evaporator coil and return-air ducts on the bay side to need more aggressive treatment than the street side. That directional moisture pattern is one we have tracked across hundreds of Foster City jobs since 2013, and it changes how we approach every visit. Call (806) 606-6902 and we will give you a written price for your system before any panel comes off.
Foster City is a different animal from the rest of the Peninsula. The man-made lagoons that run through nearly every neighborhood are scenic, yes, but they also keep the air damp in a way that San Mateo and Belmont never experience. Damp air moves through return ducts, settles on coils, and turns leftover construction dust into a paste. We see it on the bay side of lagoon-fronting homes more than anywhere else in the Bay Area. If you own a house here, that matters to how your HVAC should be cleaned, and by whom.
Why CleanRun Air Duct Cleaning Is Foster City’s Preferred HVAC Cleaning Company
CleanRun has been documenting the inside of Foster City ductwork since our first job in 2013. That documentation is the difference. Every visit ends with a photo record of every duct run, taken before and after, so you can see what was actually removed. Not a verbal summary. Footage. The same standard applies to the written price: Haven Standard Clause 1 means you get a written price before any work starts, on every job, with no exceptions and no “we’ll see once we get in there.”
Our technicians know which Foster City neighborhoods have the oldest original ductwork, where the fog sits longest, and how a lagoon-facing return plenum behaves differently from a street-facing one. That local knowledge is not decorative. It determines the order of operations, the dwell time on coil treatment, and whether we recommend a full source-removal clean or a targeted coil-and-blower service. Tomas Reyes, who leads our crews, trains every technician on the H.A.V.E.N. Standard, including Clause 3: Verified Crews. Every tech is background-checked, uniformed, and identified by name before arrival.
We also put our work in writing after the fact. The 365-Day Done Right Promise is a written guarantee, not a phone-call favor. If the job is not right, we make it right, and that promise rides with every invoice.
Our HVAC Cleaning Services in Foster City
Evaporator Coil Cleaning
In Foster City, the evaporator coil is ground zero for moisture-driven contamination. Lagoon humidity condenses on the coil surface, and whatever is in your air supply sticks to that wet metal. In a new build, that means drywall dust and fiberglass from construction. In an older home, it means years of organic film that cuts efficiency and drives up cooling costs. We pull the coil, inspect it with a camera, and clean it with professional-grade equipment from Abatement Technologies. You see the before and after, including the underside of the coil where most companies never look.
Air Handler Cleaning
Your air handler is the cabinet that houses the blower and the coil. When we pull the cover off an air handler in a Foster City home, we regularly find a layer of fine dust caked onto the blower wheel, the housing, and the drain pan. In lagoon-fronting homes, that dust is often damp and starting to clump. We clean the blower wheel blade by blade, clear the condensate drain line, and treat the coil. This is not a register-cleaning service; it is the inside of the machine that moves your air.
Blower Cleaning
A dirty blower wheel moves less air, works harder, and pushes whatever it has accumulated back through your home. Foster City’s marine air means the blower wheel picks up a fine, slightly sticky residue that a dry brush alone will not remove. We use agitation tools and negative-pressure extraction to pull debris out rather than blow it around, then show you the wheel in the after photo. In homes built between the mid-1960s and mid-1980s, original blower assemblies often have 40 to 55 years of accumulated film. A focused blower clean makes an immediate, audible and measurable difference in airflow.
Condenser Cleaning
The outdoor condenser coil deals with a different kind of Foster City contamination: salt air, fog condensate, and lawn debris. A condenser caked with salt film and grass clippings cannot reject heat properly, which means longer run times and higher bills. We wash the coil with the right pressure and chemistry for your equipment, clear the surrounding area, and photograph the fins so you can see the difference. Condenser cleaning is scheduled as part of a full-system service or standalone when the outdoor unit is the obvious problem.
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 Foster City
We work on Honeywell and Aprilaire systems regularly in Foster City, along with a full range of residential equipment found in the city’s 1960s-to-1980s housing stock. Because so much of Foster City was built in a compressed window, we know the original sheet-metal and early flex-duct configurations that show up in home after home here. That familiarity means faster diagnosis and less time spent figuring out what we are looking at. We also stock common replacement parts and filters for systems common to the area, which keeps the job moving without a second trip.
Common HVAC Cleaning Problems We See in Foster City Homes
- Bay-side dampness in return ducts: Return-air ducts on the lagoon-facing side of a Foster City house consistently show heavier mold and moisture staining than street-side runs. Same house, same system, two different conditions. We check both sides and document the difference.
- Post-construction debris left in new builds: Builders rarely perform a source-removal clean after final punch-out. Drywall dust and fiberglass particles sit in brand-new ducts, then meet Foster City’s humid bay air and start clumping. We have pulled this exact slurry out of homes in the Port Royal neighborhood months after handover.
- Aging original ductwork: Homes built in Foster City’s master-planned boom years, roughly 1965 to 1985, often still run on original fiberglass-lined sheet metal. That lining degrades, holds moisture, and sheds particles. Older flex ducts develop sags that trap debris. We inspect every run with a camera before we recommend a scope of work.
- Coils and blowers that never get cleaned: The most common partial service we see is a company that washes the visible registers and calls it a day. The evaporator coil and blower motor, where construction dust and mold collect fastest in Foster City’s humidity, go untouched. We open the air handler on every full-system HVAC cleaning and document what we find.
Pricing for HVAC Cleaning in Foster City, CA
A full HVAC cleaning on a typical Foster City single-family home runs $425-$780. That includes evaporator coil cleaning, blower wheel cleaning, air handler interior cleaning, condenser coil cleaning, and a documented photo record of every duct run. Larger homes with multiple air handlers or zoned systems run $800-$1,150. If your house is lagoon-fronting, we may recommend a coil treatment as part of the service, which adds $90-$160 depending on coil size. Every quote is written and delivered before work starts, under Haven Standard Clause 1. Call (806) 606-6902 and we will give you a number for your specific system, not a range you have to guess against later.
One flat price per system. No per-vent pricing. No add-on pressure once the van is in your driveway. We photograph everything, and the price is the price.
We Also Serve Cities Near Foster City
CleanRun serves homeowners across the Bay Area and Southern California. If you are outside Foster City but still need this level of documentation and written pricing, we also operate in Los Angeles, San Diego, San Jose, and San Francisco. Learn more about our HVAC Cleaning service or see what we do for Foster City homeowners specifically. The same written-price standard and photo record apply wherever we work.
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 - HVAC Cleaning in Foster City
Because the builder almost never does a post-construction source-removal clean. Drywall dust, sawdust, and fiberglass insulation particles sit in the supply and return ducts after final punch-out. In Foster City’s lagoon humidity, that debris absorbs moisture within weeks and begins to clump, then mold. We have documented this in newly handed-over homes throughout the Port Royal and Windward areas. The HVAC in a brand-new Foster City house is often dirtier than a well-maintained 10-year-old system in a drier city.
Yes, and it is consistent enough to be a diagnostic signal. Return-air ducts on the lagoon-facing side of a Foster City home regularly show heavier mold and moisture staining than the street-facing side of the same house. The persistent damp air off the water moves through the return path on that side, condenses in the ducts, and feeds biological growth. A technician working in San Mateo or Belmont rarely sees this directional pattern. We always inspect both sides and photograph the difference, because cleaning only the dry side leaves the problem half-untouched. Call (806) 606-6902 for a written quote that accounts for this.
Yes. Foster City’s original housing stock, built mostly between the mid-1960s and mid-1980s, often contains fiberglass-lined sheet-metal ducts or early flex-duct runs. The fiberglass lining breaks down over 40 to 55 years of bay-air exposure, shedding particles and holding moisture. Aggressive rotary brushes can damage that degraded lining. We use negative-pressure extraction with agitation tools sized to the duct material, and we adjust our approach after the camera inspection shows what we are working with. Older systems often need a coil and blower focus first, since that is where the worst accumulation sits.
Within the first three to six months, and ideally before you move furniture in. The longer post-construction debris sits in ducts exposed to Foster City’s humidity, the more it compacts and the harder it is to remove. We pulled the air handler cover on a lagoon-fronting home in Port Royal where the owners had moved in three months earlier. The bay-side return ducts were already coated with dark moisture staining, and the drywall dust left by the builder was mixing with damp air and starting to clump. A cleaning at 90 days would have been a straightforward source removal. At six months in a damp house on the water, it is a more involved job.
Register cleaning is cosmetic. It addresses the visible grilles and maybe the first few inches of duct behind them. A full HVAC clean opens the air handler, pulls and cleans the evaporator coil, cleans the blower wheel blade by blade, washes the condenser coil, treats the coil surfaces, and removes debris from the full duct runs with negative-pressure extraction. In Foster City’s humidity, the coil and blower are where mold and construction dust collect fastest, so skipping them means the system re-contaminates itself within weeks. We photograph the inside of everything, not just the parts you can see standing in the hallway.
Get Your Written Quote for HVAC Cleaning in Foster City
Every job starts with a written price and ends with a photo record. That is the CleanRun standard, and it applies to every home in Foster City, from the lagoon-fronting streets to the inland side near Hillsdale Boulevard. If you have a competitor’s estimate, we will put our number next to it in writing at no cost. Call us at (806) 606-6902 and we will schedule a time to inspect your system, give you a flat price, and show you what is actually inside your ducts.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning, serving Foster City since 2013.
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