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
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Before
AfterAir Duct Cleaning Company in Duvall, WA
Hollis Air Duct Cleaning handles duct cleaning, dryer vent cleaning, and duct sealing in Duvall, WA, where the Snoqualmie Valley’s wet climate and mixed housing stock create problems you won’t find in dry-side suburbs. We dispatch crews from our Seattle office and serve Duvall homes with Rotobrush rotary brush systems and Nikro negative-air machines, pricing every job in writing before we start. Call (361) 326-5060 for a free estimate.
Most Duvall homes sit in one of the wettest lowland microclimates in the Puget Sound region. That near-constant humidity, combined with pollen from surrounding forests and seasonal rodent pressure from farmland edges, means ducts here accumulate moisture, organic debris, and blockages faster than systems in Bellevue or Redmond. We’ve cleaned ductwork in 1990s two-story builds near Cherry Valley and original metal trunk lines in valley-floor farmhouses that date back half a century. The work changes based on what the house is fighting.
Why Duvall Homes Are Different
Duvall’s geography shapes every job we do here. The city sits in the Snoqualmie Valley floor, collecting roughly 38 – 40 inches of annual rainfall with cool, damp winters that keep crawlspaces and basements perpetually moist. That moisture condenses inside ductwork, especially in flexible duct runs common in 1990s – 2010s suburban builds around neighborhoods like Duvall Hill and Big Rock. Condensation leads to mold spore accumulation, musty airflow, and reduced HVAC efficiency.
The older housing stock tells a different story. Valley-floor farmhouses and 1970s – 80s ranchers near the Snoqualmie River often run original galvanized metal ductwork with deteriorated seams and no insulation. After fall harvest and the first heavy rains, we routinely find mouse nests and acorn caches in crawlspace trunks, something dry-side cities rarely see. These homes need more than cleaning; they need inspection for intrusion points and leakage. We factor that into every Duvall quote.
Our Main Duvall Services
These are the three services Duvall homeowners call us about most. Each has its own page with detailed pricing, process, and local conditions.
Air Duct Cleaning in Duvall
Our air duct cleaning in Duvall uses a Rotobrush rotary brush system to scrub debris from interior duct walls, paired with a Nikro negative-air machine that pulls dislodged material out of your home entirely. In Duvall’s humid climate, we pay special attention to condensate lines and flex-duct sag points where moisture pools. We inspect for rodent entry, photo-document before and after, and leave you with a written report. Air Duct Cleaning in Duvall
Dryer Vent Cleaning in Duvall
Dryer vent cleaning in Duvall addresses a fire hazard that worsens in wet weather. Lint trapped in long vent runs, especially in two-story suburban builds with roof terminations, absorbs atmospheric moisture and compacts into dense blockages. We clear the full run from appliance to termination, verify airflow with a meter, and flag damaged vent hoods or improper materials. Dryer Vent Cleaning in Duvall
Duct Sealing in Duvall
Duct sealing in Duvall targets the leakage that wastes heated air into crawlspaces and draws musty, rodent-affected air back into supply lines. We apply mastic sealant to accessible joints and evaluate whether metal trunk lines in older homes need replacement versus sealing. Sealed ducts reduce energy bills and cut the humidity load your system fights year-round. Duct Sealing in Duvall
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 Duvall
We stock parts and filters from Honeywell, Aprilaire, and Guardsman for Duvall service calls, with Abatement Technologies HEPA filtration available for homes with allergy or respiratory concerns. Most replacement components arrive within 24 – 48 hours through our Seattle coordination office. See our brands for the full equipment roster.
Pricing for Air Duct Cleaning Company in Duvall, WA
| Service | Typical range in Duvall |
|---|---|
| Whole-house air duct cleaning (single system, up to 12 vents) | $380 – $520 |
| Whole-house air duct cleaning (larger home, 13 – 20 vents) | $520 – $720 |
| Dryer vent cleaning (ground-floor termination, standard length) | $140 – $190 |
| Dryer vent cleaning (roof termination or extended run) | $190 – $260 |
| Duct sealing (mastic application, accessible joints only) | $450 – $650 |
| Duct sealing with aerosolized sealant (whole system) | $1,200 – $1,800 |
| Rodent nest removal and sanitizing (crawlspace trunk line) | $280 – $420 |
| Additional HVAC zone cleaning | $180 – $260 |
Prices in Duvall run toward the higher end of these ranges when crawlspace access is tight, when original metal ductwork requires extra handling, or when fall rodent activity has left extensive nesting material. We write the price down before any work starts, and that number does not move at the door.
Neighborhoods We Serve in Duvall
We cover all of Duvall proper and the surrounding unincorporated valley floor. Crews typically schedule Duvall appointments in a morning or afternoon window, with most jobs completed in 2 – 4 hours depending on system size and accessibility.
- Duvall Hill
- Big Rock
- Cherry Valley
- Hollywood Farm area
- Snoqualmie Valley floor (unincorporated)
Service Area – Cities Near Duvall
Our crews regularly work the corridor between Duvall and surrounding communities, including Sammamish, WA to the south, Woodinville, WA to the southwest, and Redmond, WA across the valley ridge. We also coordinate with our Garrison Partners location in Monroe, GA for shared training and equipment standards. Scheduling is handled through our Seattle office with local Duvall dispatch.
Serving Duvall, WA - Our Local Coverage Area
We’re based in the Duvall 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 Duvall
We typically schedule Duvall appointments within 3 – 5 business days, with flexibility for urgent situations like confirmed rodent intrusion or complete dryer vent blockage. Call (361) 326-5060 to check current openings.
Most Duvall neighborhoods do not require HOA notification for interior duct work, but a few newer developments near Big Rock ask for 24 – 48 hour notice for any service vehicle parking. We can provide a work description letter if your HOA requests it.
Yes. We cover the unincorporated Snoqualmie Valley floor around Duvall, including properties on rural roads with crawlspace or basement duct access. Travel time is built into your written quote, not added later.
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 Duvall Customers Say
"Duct sealing along with the cleaning cut our summer bill. Straight talk and fair price."
- Gwen O."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.