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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Before
AfterAir Duct Cleaning Company in Portola Valley, CA
Air duct cleaning in Portola Valley typically runs $450 – $950 for a whole-home system, with most jobs completed in a single visit. We’re Hollis Air Duct Cleaning, and we handle the extended duct runs, multi-zone systems, and wildfire smoke residue that define work in this town. Our crews arrive inside the quoted window, price the job in writing before touching anything, and back every visit with our 365-Day Done Right Promise. Call (361) 326-5060 for a free estimate.
Why Portola Valley Homes Are Different
Portola Valley sits in a high-fire-severity zone where the Santa Cruz Mountains meet the eastern foothills, and that geography changes everything about how we clean ducts here. Dry summers and fall Diablo winds push wildfire smoke and fine ash through outdoor air intakes and attic vents, coating ductwork in sticky residue that standard vacuuming won’t touch. Winter rains follow, forcing damp, allergen-laden air through the same system. Most Portola Valley homes were built between the 1950s and 1990s, sprawling custom designs on multi-acre lots with long, winding duct runs and extensive flex duct that traps debris in ways compact suburban systems don’t. The town’s strict dark-sky and rural preservation ordinances mean nearly every home is architect-designed with complex, extended duct runs that require specialized cleaning approaches. And because most properties rely on well water and septic systems, there’s no basement or crawlspace ventilation to relieve pressure, so ducts become the primary pathway for smoke and dust to enter living spaces.
Our Main Portola Valley Services
Portola Valley homeowners call us for three jobs, each with its own challenges in this terrain.
Air Duct Cleaning in Portola Valley
We clean the full supply and return network with Rotobrush rotary brush systems and Nikro negative-air machines, pulling debris from the long, winding runs common in Portola Valley’s hillside homes. After wildfire events, we often find attic-mounted air handlers have drawn smoke directly through unsealed attic spaces, leaving fine ash that requires methodical agitation and extraction. Every job gets a written price before we start and before-and-after photos of your own ducts. Air Duct Cleaning in Portola Valley
Dryer Vent Cleaning in Portola Valley
Dryer vent cleaning in Portola Valley means navigating extended exhaust runs through custom home layouts, often with multiple bends and vertical rises that trap lint in ways standard kits can’t reach. We use professional-grade rotary tools and airflow meters to verify the vent is fully clear, not just punched through. This matters in a high-fire zone where lint buildup is a genuine ignition risk. Dryer Vent Cleaning in Portola Valley
Duct Sealing in Portola Valley
Duct sealing with mastic and specialized tapes closes the gaps where wildfire smoke, attic dust, and conditioned air leak in and out. In Portola Valley’s older flex-duct systems, we often find separations at junction boxes and crushed runs from decades of settling. Sealing improves efficiency and blocks the infiltration path that makes smoke events so severe here. Duct Sealing in Portola Valley
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Portola Valley
We stock parts and filtration products from Aprilaire, Abatement Technologies, and Guardsman, with Rotobrush systems on every truck. Most filter replacements and component swaps happen same-visit. See our brands for the full roster.
Pricing for Air Duct Cleaning Company in Portola Valley, CA
| Service | Typical range in Portola Valley |
|---|---|
| Whole-home air duct cleaning (single system) | $450 – $950 |
| Whole-home air duct cleaning (dual-zone system) | $750 – $1,400 |
| Dryer vent cleaning (standard run) | $150 – $280 |
| Dryer vent cleaning (extended/complex run) | $250 – $400 |
| Duct sealing (partial system) | $400 – $800 |
| Duct sealing (whole-home) | $900 – $1,800 |
| HVAC filter upgrade (Aprilaire/Guardsman) | $85 – $220 |
| Post-wildfire smoke remediation cleaning | $650 – $1,200 |
What pushes Portola Valley prices toward the higher end: extended duct runs with multiple zones, attic-mounted systems requiring extra access time, and heavy wildfire ash residue that demands additional agitation cycles. We give one flat price per system, agreed in writing before any work starts. No per-vent pricing, no add-ons at the door.
Neighborhoods We Serve in Portola Valley
We work across Portola Valley’s full residential area, from the winding lanes of the hillside districts to the ranch-style spreads along Portola Road. Crews dispatch from our Los Angeles coordination office and schedule Portola Valley routes to minimize drive time and keep arrival windows tight.
- Brookside
- Central Portola Valley
- Blue Oaks
- Woodside Highlands (Portola Valley side)
- Ladera
Service Area – Cities Near Portola Valley
Our crews regularly work the full Peninsula corridor. We schedule jobs in Stanford, CA, Menlo Park, CA, Los Altos, CA, and Atherton, CA on the same routing days as Portola Valley, so neighboring homeowners can book without extended waits.
Serving Portola Valley, CA - Our Local Coverage Area
We’re based in the Portola Valley 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 About Air Duct Cleaning Company in Portola Valley
No permit is required for standard duct cleaning or dryer vent cleaning. Duct sealing that involves modifying ductwork may need Portola Valley building division review if it alters the HVAC system’s capacity. We handle any required documentation and explain it before work starts. Call (361) 326-5060 if you’re unsure about your specific project.
We prioritize Portola Valley calls after red-flag warnings and major smoke events, typically scheduling within 48 – 72 hours. Our phones are answered by a live person 24/7, so you can book immediately rather than waiting for a callback queue.
Yes. We cover all Portola Valley addresses, including properties on private roads and gated lanes. Our technicians carry GPS coordinates for the winding hillside roads and confirm access details when you book. Call (361) 326-5060 to confirm coverage for your specific address.
What happens when you call
- 1A real person answersNo phone trees - talk to a local air duct cleaning pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Portola Valley Customers Say
"Sealed some leaking duct joints in the crawl space with mastic. Rooms that were always cold now get air."
- Ronald W."Dryer vent was packed with lint and took two hours to dry a load. Cleaned it out from the roof cap down. One cycle again."
- Paula Q."No sales pitch. Told me which parts of the system were fine and only cleaned what needed it."
- Ted L.