Fast, Reliable Air Duct Cleaning Across Los Altos
Air duct cleaning in Los Altos typically costs $350-$850 for a full residential system, with most jobs completed in a single visit by our background-checked technicians. We serve the 94022, 94023, and 94024 ZIP codes with same-day and next-day availability, and every job starts with a camera inspection so you see what we see before any work begins.
We’ve been driving to Los Altos since 1984, long before the Foothill Expressway was the corridor it is today. Our office answers calls live, 24 hours a day, at (844) 685-6342. No voicemail, no app. If you’re in Old Los Altos, along Grant Road, or up toward the foothills near Montclaire Road, we’ll be there when we say. Los Altos homes carry a specific burden: fifty-year-old duct systems that have survived multiple wildfire seasons, temperature inversions, and well-meaning renovations that never touched the air passages behind the walls. That’s the work we do.
Why Bellows Air Duct & Vent Co. Is Los Altos’s Preferred Air Duct Cleaning Company
Ray Castillo has led Bellows Air Duct & Vent Co. since its founding in 1984, and our reputation in Los Altos is built on showing up, doing the job right, and standing behind it without paperwork or arguing. We’re not the cheapest name in the phone book, and we don’t try to be. We’re the company you call when you’ve already been burned by a low-bid operator who left dust in the trunk lines and a bill that doubled at the door.
Our technicians are uniformed, background-checked, and equipped with Rotobrush and Nikro professional-grade systems - the same brands serious HVAC contractors specify for their own jobs. Every clean includes video inspection before and after, so you have a visual record, not just our word. Most Los Altos jobs finish in one visit. Our 90-Day Done Right Promise is stamped on every invoice: if it’s not right, we return at no charge, no forms to fill out.
Calls are answered by a live person, 24/7. Our Air Duct Cleaning team knows the difference between a 1958 ranch on a flat lot near Foothill Expressway and a 1970s split-level with ad-hoc flex-duct additions. That local knowledge matters when we’re deciding whether your system needs cleaning, sealing, or a more thorough retrofit.
Our Air Duct Cleaning Services in Los Altos
Residential Duct Cleaning
Los Altos’s core housing stock - post-war ranches built 1952 to 1975 in neighborhoods like Old Los Altos and along the Grant Road corridor - carries original trunk-and-branch ductwork that has never been properly cleaned. We use camera-guided Rotobrush agitation and Nikro HEPA vacuum collection to remove embedded debris without damaging aged sheet-metal joints. A typical residential full-system clean in Los Altos runs $450-$850 depending on system size and accessibility.
Commercial Duct Cleaning
Los Altos’s commercial base includes professional offices along El Camino Real and medical suites near the downtown core. These buildings face the same wildfire smoke infiltration as residences, plus higher occupancy loads that accelerate duct contamination. We schedule commercial work to minimize disruption to your business, with upfront pricing disclosed before we start.
Supply Duct Cleaning
Supply lines in Los Altos’s older homes often show the heaviest smoke residue buildup because positive pressure pushes particulates toward room vents. Our supply duct service includes register removal, line-by-line brushing, and post-clean airflow verification. If you’ve added a whole-house purifier but skipped the ductwork, this is where we typically find the problem.
Return Duct Cleaning
Return ducts pull air back to your HVAC unit, and in Los Altos’s 1960s ranches, these lines are often original sheet-metal with deteriorated insulation and joint gaps that collect debris for decades. We camera-inspect every return run to identify separation points that cleaning alone won’t fix. When we find them, we’ll show you and explain your options.
Full System Cleaning
This is our most comprehensive service and the one we recommend for most Los Altos homes with original ductwork. Full System Cleaning covers supply and return lines, trunk lines, plenums, and the air handler cabinet. In Old Los Altos neighborhoods, we regularly find that homeowners have layered equipment upgrades - new condensers, smart thermostats, high-MERV filters - onto duct systems that haven’t been touched since the Johnson administration. The result is new hardware straining against old restrictions. Full system cleaning addresses the foundation.
Video Inspection
Every job we do in Los Altos starts here, and many should end here too if you’re deciding whether to clean or replace. Our camera systems navigate trunk lines and branch ducts to show you joint separations, insulation breakdown, smoke residue layers, and debris accumulation in real time. In a 1964 ranch off Grant Road, we recently inspected a system where the owners had installed a top-tier Aprilaire whole-house purifier without ever servicing the original sheet-metal ducts. Our video revealed decades of smoke residue layered inside the trunk line - residue from the 2020 CZU fires and earlier seasons - so the purifier was simply recirculating baked-in debris. They saw it. We cleaned it. The purifier finally worked as designed.
What happens when you call
- 1
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.
Trusted Brands We Service in Los Altos
We clean and service ductwork connected to all major HVAC brands, and we stock parts from Abatement Technologies, Guardsman, and Rotobrush for faster turnaround on Los Altos jobs. Many of our customers run Honeywell or Aprilaire whole-house air purifiers - common upgrades in this market - and we coordinate cleaning protocols to protect that equipment. Our technicians carry the fittings and adapters needed for older trunk-and-branch systems, not just modern flex-duct layouts. That parts availability matters when you’re working on a 1960s system that doesn’t match anything in the current catalog.
Common Air Duct Cleaning Problems We See in Los Altos Homes
- High-MERV filters and purifiers installed on dirty ducts. We see this constantly in Los Altos’s tech-savvy neighborhoods: a homeowner adds a whole-house Aprilaire or upgrades to MERV 13 filtration, but the underlying ductwork still carries decades of smoke residue, pollen, and agricultural dust. The new equipment strains against the restriction and recirculates embedded debris. Clean first, upgrade second.
- Original trunk-and-branch ducts with hidden joint failures. The sheet-metal systems in 1950s-1970s Los Altos ranches were built with snap-lock seams and fiberglass insulation that degrades after fifty years. Our video inspection finds separations behind walls that standard cleaning methods would miss entirely. Cleaning a separated duct line just blows debris into your ceiling or crawl space.
- Ad-hoc flex-duct extensions creating debris traps. Room additions in Los Altos often added flexible duct extensions to original trunk lines without proper support or sealing. These sagging sections collect debris and restrict airflow, but they’re invisible until we camera the full system. We’ve found extensions buried in attic insulation, completely detached, still blowing conditioned air into the rafters.
- Wildfire smoke particulates embedded beyond filter reach. Los Altos sits directly at the base of the Santa Cruz Mountains foothills, making it a first-capture zone for wildfire smoke that funnels down through the hills each fall. Smoke particulates infiltrate HVAC systems and embed in ductwork in ways that standard filter changes cannot address. The 2020 CZU fires and subsequent seasons have layered residue into systems that were already decades old.
Pricing for Air Duct Cleaning in Los Altos, CA
We’re upfront about numbers because we’ve seen what bait-and-switch pricing does to homeowners. Here’s what air duct cleaning costs in the Los Altos market:
| Service | Typical Range in Los Altos |
|---|---|
| Residential full-system cleaning (average 3-4 bedroom ranch) | $450 - $850 |
| Video inspection only (credited toward cleaning if hired) | $125 - $175 |
| Supply or return duct cleaning (single system) | $275 - $450 |
| Commercial duct cleaning (per square foot) | $0.25 - $0.45 |
| Duct repair/sealing after inspection (per linear foot) | $15 - $35 |
Factors that move the price: system size, accessibility (crawl space vs. attic), degree of contamination, and whether we find separations or damage requiring repair. We disclose the full price before we lift a single tool. The number on the phone is the number on the invoice. Call (844) 685-6342 for a free estimate - we’ll ask about your home’s age, square footage, and any equipment upgrades you’ve added, then give you a firm range.
Standing offers: $50 off any repair over $250; free second opinion on any written estimate; $89 seasonal tune-up; permanent 5% senior and veteran discount.
We Also Serve Cities Near Los Altos
Our service area covers the full Santa Clara Valley corridor. We regularly work in Los Altos and the surrounding communities: Mountain View to the north, Sunnyvale to the east, Cupertino to the south, and Palo Alto to the northwest. The same wildfire smoke and temperature inversion patterns affect all these cities, but Los Altos’s position at the foothills creates a uniquely heavy contamination burden. If you’re in any of these neighboring cities and your home dates to the 1950s-1970s, the same principles apply.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos 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 - Air Duct Cleaning in Los Altos
Standard HVAC filters capture particles down to roughly 3-10 microns depending on rating, but wildfire smoke contains ultrafine particulates below 1 micron that pass straight through and embed in duct walls. In Los Altos, where smoke funnels down from the Santa Cruz Mountains, these particulates accumulate in sheet-metal trunk lines and flex-duct interiors that filters never touch. Changing the filter protects the equipment; cleaning the ducts protects the air you breathe. Call (844) 685-6342 for a free estimate - we’ll camera-inspect and show you exactly what’s in there.
Yes, and in many Los Altos homes it’s the difference between effective and wasted investment. We’ve found purifiers straining against decades of embedded debris in original ductwork, essentially recirculating old contamination through new equipment. Clean ducts reduce the particulate load your purifier must handle, extend filter life, and allow proper airflow rates. Our video inspection will show you whether your ducts are helping or undermining your purifier. Estimates are free - call (844) 685-6342.
Signs include visible insulation crumbling, sagging sections, musty odors that persist after cleaning, and airflow weak enough to create temperature imbalances between rooms. Our video inspection identifies internal deterioration - torn inner liners, collapsed sections, or biological growth - that cleaning cannot fix. In Los Altos’s 94022 and 94024 ZIPs, we often see flex-duct added during 1980s-1990s renovations that has now reached end of life. We’ll show you the camera footage and give honest guidance on clean vs. replace. Call for a free inspection.
Some policies cover HVAC and duct cleaning as part of smoke damage claims, but coverage varies by carrier and requires documentation of contamination. We provide detailed video inspection records and written condition reports that many Los Altos homeowners have used successfully in claims. We do not bill insurance directly; we charge you our standard rate and provide the documentation you need for reimbursement. Call (844) 685-6342 to discuss your situation and schedule an inspection.
Temperature inversions trap ground-level particulates - wildfire smoke, grass pollen from the surrounding hills, and orchard-era agricultural dust - keeping them cycling through residential HVAC systems far longer than in coastal cities with stronger onshore flow. Los Altos’s position at the valley’s western edge, immediately downslope from the fire-prone Santa Cruz Mountains, means duct contamination from smoke events is measurably heavier here than in flatland cities like Sunnyvale or Santa Clara a few miles east. Your system works harder, filters clog faster, and ducts accumulate residue more quickly. Regular professional cleaning with video verification is the only way to address what’s trapped in the lines. Call (844) 685-6342 for a free estimate.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Los Altos since 1984.