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 Belmont
HVAC cleaning in Belmont means pulling apart systems that have spent decades breathing fog. Most homes here need evaporator coil cleaning, blower cleaning, and air handler cleaning done as one connected job, because contamination moves through the whole system once it starts. A typical whole-system HVAC cleaning in Belmont runs $425-$780 depending on system size and access. If you’re calling from the hillside neighborhoods above Ralston Avenue, expect the scope to include duct sealing and insulation because fog-driven moisture keeps coming back. Call us at (806) 606-6902 and we’ll give you a written price before any work starts.
We’re CleanRun Air Duct Cleaning. Since 2013, we’ve completed over 52,000 jobs across the Bay Area, every one with a written price agreed before a panel came off and a documented photo record delivered when the crew left. Our HVAC Cleaning crews know Belmont’s housing stock: the flatland tract ranches along Ralston Avenue, the split-levels and custom builds climbing toward the Belmont Hills, and the way marine fog changes how ductwork behaves in each. Dispatch and scheduling coordinate from the brand’s San Francisco Bay Area office, but the technicians who show up at your door work Belmont regularly. They’ve seen what this micro-climate does.
Why CleanRun Air Duct Cleaning Is Belmont’s Preferred HVAC Cleaning Company
Belmont homeowners don’t call us because their ducts look dusty. They call us because the condensation keeps coming back, or because a camera inspection showed something in the crawl space that a basic vacuum service never touched. We built our reputation in Belmont on documentation: every job ends with a photo record showing the inside of each duct run before and after. You see exactly what was removed and what was sealed.
Our technicians are background-checked, uniformed, and identified by name before arrival. That’s Haven Standard Clause 3: Verified Crews. Every job is quoted with a written price before work begins, with no exceptions, under Haven Standard Clause 1. And every job carries the 365-Day Done Right Promise in writing. If the work isn’t right, we make it right. Not subject to a manager’s approval. On paper.
We carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration and air quality components from Honeywell and Aprilaire. These are trade-recognized brands you can look up independently before you agree to a quote. Belmont customers who’ve had us out know the difference between a shop-vac pass and negative-pressure source removal with HEPA filtration. We also offer a Free Second Opinion on any written estimate. Bring a competitor’s quote and we’ll put our number next to it in writing.
Our HVAC Cleaning Services in Belmont
Evaporator Coil Cleaning
In Belmont, the evaporator coil is where fog-driven moisture and dust meet. The coil sits in the air handler and condenses moisture out of the air as it cools. When that coil gets coated with dust and biological growth, it can’t transfer heat efficiently. We pull the coil, clean it with professional-grade coil cleaners, and photograph the result. A typical evaporator coil cleaning in Belmont runs $180-$340 as part of a full system job. In hillside homes where condensation is chronic, we often recommend coil treatment with an antimicrobial product like Guardsman to slow regrowth between cleanings.
Blower Cleaning
The blower motor pushes conditioned air through your ducts. When the blower wheel is caked with dust, airflow drops and the system runs longer to hit the thermostat setting. In Belmont’s 1950s-1970s tract ranches, we frequently find blowers that haven’t been serviced since the original install. Blower cleaning in Belmont runs $120-$220 when done as part of a full HVAC cleaning. We remove the blower assembly, clean the wheel and housing, and check motor function. If the blower shows signs of bearing wear, we’ll tell you before any additional work is proposed, with a written number.
Condenser Cleaning
The condenser is the outdoor unit, the one sitting in your yard or on a hillside pad. Belmont’s marine layer doesn’t spare outdoor units. Fog deposits moisture, dust sticks to the wet fins, and efficiency drops. Condenser cleaning in Belmont runs $110-$200. We remove the outer jacket, flush the fins with coil cleaner, and clear debris from inside the cabinet. On fog-exposed hillside lots, we also check for corrosion on the coil fins, which the persistent humidity accelerates. If we see early corrosion, we document it in your photo record so you can track it over time.
Air Handler Cleaning
The air handler is the indoor unit that houses the evaporator coil, blower, and often the filter. In Belmont, air handlers in crawl spaces and attics absorb the same fog-saturated air that causes duct condensation. Air handler cleaning in Belmont runs $160-$300 as part of a full HVAC cleaning. We remove the access panels, clean the interior surfaces, clean the coil and blower if they’re in the same cabinet, and replace the filter if you have a standard size on hand. If the condensate pan or drain line is clogged, we clear it and document the condition before and after.
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 Belmont
We service and clean equipment from every major manufacturer you’ll find in Belmont homes: Carrier, Trane, Lennox, Rheem, Goodman, and York, plus high-efficiency systems from Mitsubishi and Daikin. We also install and maintain air quality components from Honeywell and Aprilaire, including media filters, UV purifiers, and dehumidifiers. In Belmont specifically, a whole-home dehumidifier or a smart thermostat with humidity control can make the difference between a clean that lasts three months and a clean that lasts three years. We stock common filters and replacement parts locally, which reduces turnaround time for Belmont customers. If your system needs a part we don’t have on the truck, we tell you when it’ll arrive and what the written cost is before we order anything.
Common HVAC Cleaning Problems We See in Belmont Homes
- Mold recolonization within months of a surface cleaning. A basic vacuum pass removes loose dust but doesn’t address the condensation feeding biological growth inside ducts. In fog-exposed crawl spaces and attics, surfaces stay damp enough that mold returns within one fog season unless the ducts are sealed and insulated.
- Crushed or disconnected duct runs in hillside split-levels. We regularly find flex duct sagging, kinked, or separated at the joints in tight Belmont crawl spaces. Homeowners only notice the symptoms: weak airflow in one room, a pressure imbalance, or a cold spot in winter. A camera inspection shows the actual problem.
- Liner delamination in original flex duct. Repeated condensation cycles cause the inner liner of 1970s-era flex duct to separate and flake. Those fiberglass particles then circulate through the supply air even after the blower and coil are cleaned. If we find delamination during a cleaning, we document it and provide a written recommendation for replacement or sealing.
- Fog-exposed downhill ducts that mold while uphill ducts stay clean. This is the condensation gradient specific to Belmont. The downhill side of a split-level sits in colder, wetter air near the crawl space’s fog side. We’ve documented systems where one return duct is heavily colonized and the identical duct on the opposite side of the house is clean.
Pricing for HVAC Cleaning in Belmont, CA
Here are the numbers we quote in Belmont. A whole-system HVAC cleaning, including evaporator coil cleaning, blower cleaning, and air handler cleaning, runs $425-$780 for a typical single-family home on the flatlands. Hillside homes with multi-level duct routing and difficult crawl space access run $600-$950. If you need duct sealing and insulation work because fog-driven condensation keeps returning, add $800-$1,800 depending on the linear feet of duct affected. Condenser cleaning alone is $110-$200. Coil treatment with Guardsman runs $90-$180. These are our written prices, provided before work starts, every time.
What drives the price up in Belmont? Crawl space access, duct length, how many runs need camera inspection, and whether sealing or insulation is required. What drives it down? A straightforward single-level system with good access and ducts that haven’t been contaminated by condensation. We don’t do per-vent pricing. We’ve never done per-vent pricing. You get one flat written price per system, agreed before any work begins. That’s the whole point of Haven Standard Clause 1.
To get the exact number for your home, call (806) 606-6902. We’ll ask about your system, your home’s layout, and what you’re seeing. Then we’ll give you a written price before we schedule the visit.
We Also Serve Cities Near Belmont
Our Belmont crews also cover San Carlos, San Mateo, Redwood City, and Burlingame. San Carlos homeowners deal with many of the same hillside condensation issues, but the fog gradient in Belmont is more pronounced because of how the Belmont Hills trap marine air. If you’re in one of these neighboring cities, the same written-price policy and photo documentation standard applies.
Serving Belmont, CA - Our Local Coverage Area
We’re based in the Belmont 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 Belmont
Belmont’s position at the base of the Coast Range means the marine fog layer stacks against the Belmont Hills and lingers. That keeps crawl spaces and attics at near-100% relative humidity for long stretches, while San Carlos’s flatter terrain lets fog burn off faster. The result is condensation inside duct runs in Belmont that doesn’t occur in most San Carlos homes. If your ducts lack proper insulation or have aged seals, that moisture feeds mold every fog season. The fix is not just cleaning; it’s sealing and insulating the ducts so condensation stops forming. Call (806) 606-6902 and we’ll put a written price on the whole job.
If the flex duct shows liner delamination, collapsed sections, or crushed runs, replacement is the honest answer. Cleaning can’t restore structural integrity. If the ducts are intact but contaminated, a NADCA-standard source removal cleaning with negative pressure and HEPA filtration is appropriate. We always camera-inspect before recommending anything. We’ll show you the photos and give you a written price for either path. No pressure, no vague warnings, just what the camera shows.
The condensation returns because warm interior air meets cold, fog-saturated duct surfaces in the crawl space or attic. Cleaning removes the biological growth, but it doesn’t stop the moisture from forming. To prevent recurrence, we re-seal supply and return ducts, wrap unconditioned runs with new insulation, and in some homes recommend a crawl space vapor barrier or dehumidifier. In homes off Ralston Avenue and in the Belmont Hills, these steps are often the difference between a one-time clean and an annual recurrence. If you want a written plan specific to your system, call (806) 606-6902.
In Belmont, yes. The downhill side of a split-level sits closer to the fog-exposed crawl space, where temperatures are colder and moisture content is higher. That side’s ducts condense more aggressively than the uphill side’s ducts, which sit in warmer, drier air. We document this condensation gradient routinely in hillside homes. It’s not a sign that half the system is fine. It’s a sign that the whole system needs sealing and insulation, with targeted cleaning on the affected side. Our camera inspection will show you exactly what’s happening inside each run.
A basic vacuum removal addresses loose dust but doesn’t achieve source removal, which is what NADCA-standard cleaning requires. In a Belmont tract home with original 1960s sheet-metal ducts, a surface-level clean often leaves biological growth adhered to the duct walls and fails to capture contaminants during extraction. Within months, the system looks like it was never cleaned. NADCA-standard cleaning uses negative pressure to contain and remove contaminants at the source, with HEPA filtration on the exhaust side. In Belmont’s humidity, that standard matters because anything left behind becomes a substrate for regrowth. Call (806) 606-6902 and we’ll walk you through what a NADCA-standard clean includes and what it costs in writing.
Get a Written Price for HVAC Cleaning in Belmont
You don’t need to guess what this should cost. You don’t need to sit through a sales pitch. Call us at (806) 606-6902 and tell us about your home and your system. We’ll give you a written price before any work starts, on every job, no exceptions. When the crew arrives, they’ll be background-checked, uniformed, and identified by name. When they leave, you’ll have a documented photo record showing the inside of every duct run, before and after. And if something isn’t right within the next 365 days, we make it right. Written promise, not a verbal one. That’s the standard we work to in Belmont, and it’s the only way we’ve ever worked.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning, serving Belmont since 2013.
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