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 Air Duct Cleaning Across Snoqualmie
Air duct cleaning in Snoqualmie runs $350 – $650 for a typical single-family home, with older mill-town properties or homes needing sealing work landing toward the higher end. We’re familiar with the three eras of Snoqualmie housing, from the early-1900s homes near Snoqualmie Falls to the tight 2010s construction up on Snoqualmie Ridge, and we dispatch crews from our Seattle office to reach most Snoqualmie addresses within the quoted window. Call (361) 326-5060 for a free estimate, or keep reading to understand why duct cleaning here is different from anywhere else in Washington.
Why Hollis Air Duct Cleaning Is Snoqualmie’s Preferred Air Duct Cleaning Company
We’ve been serving the Snoqualmie Valley since 2004 as part of the Garrison Partners family, and our technicians know what to expect when they pull registers in a home built during the Weyerhaeuser mill era versus one of the newer Ridge subdivisions. Our Air Duct Cleaning in Snoqualmie work is backed by the 365-Day Done Right Promise: if the work fails within a year, we return and make it right at no charge, including a free second visit. Every job gets a written price before we touch anything, and our crews arrive uniformed, background-checked, and inside the window we promised. Phones are answered by a live person 24 hours a day, 7 days a week, so you’re not waiting until Monday to schedule.
Ductwork Cleaning in Snoqualmie
Ductwork Cleaning in Snoqualmie is less about removing dust and more about addressing moisture-driven microbial contamination that builds inside metal ductwork during our long, damp heating season. With roughly 60 inches of annual rain on the wet west slope of the Cascades, condensation forms on the interior surfaces of supply and return ducts every October through April, creating ideal conditions for mold staining and musty odors that blow into living spaces when the furnace kicks on. A typical residential ductwork cleaning in Snoqualmie runs $350 – $550 for a standard system, while homes with extensive mold staining, crushed runs, or disconnected sections can reach $550 – $850 once sealing and repair work is included.
Source Removal Under Negative Pressure
We use Nikro negative-air machines and Rotobrush rotary agitation tools to dislodge and extract contamination from the full length of your duct runs. The negative-air method creates suction at the collection point so loosened debris is captured rather than pushed into your home. In Snoqualmie’s climate, this matters because biological growth adheres to duct walls more stubbornly than dry dust, and surface blow-through leaves the staining behind.
Sealing and Reinstatement
Cleaning alone doesn’t solve Snoqualmie’s moisture problem. We seal disconnected runs with duct mastic, reinstate crushed sections, and verify airflow balance at each register before we leave. On Snoqualmie Ridge homes, this sealing step is often the difference between a fix that lasts and mold that returns within two seasons.
Air Duct Inspection in Snoqualmie
Air Duct Inspection in Snoqualmie should happen before any cleaning work is priced, especially in the older mill-town homes near downtown where retrofitted ductwork was never sized for modern forced-air systems. Our video inspection runs a camera through the full trunk line and branch runs, documenting crushed sections, disconnected joints, and mold staining that can’t be seen from the register openings. A standalone air duct inspection in Snoqualmie costs $150 – $250, and we apply that fee toward the cleaning if you move forward with the work.
Camera Documentation
We record what the camera sees and show you the footage before we quote any work. In a 1920s home on Railroad Avenue, we might find galvanized ductwork with rust holes from decades of condensation. In a 2005 Meadowbrook build, we often find flex duct that has pulled loose at the collar. You’ll see exactly what we see.
Written Findings and Pricing
After inspection, we provide a written report with line-item pricing for cleaning, sealing, or repair work. The price is fixed before we start. No per-vent add-ons, no equipment charges that appear at the door. That’s The Garrison Standard.
Trusted Brands We Service in Snoqualmie
Our crews run professional-grade equipment that matches what commercial duct cleaners use: Rotobrush rotary brush systems for mechanical agitation, Nikro negative-air machines for controlled debris extraction, and HEPA filtration from Abatement Technologies to capture particles down to 0.3 microns. For homes needing upgraded filtration after cleaning, we stock Honeywell and Aprilaire media filters and Guardsman UV-C units that install at the air handler to suppress microbial growth between service visits. We keep common sizes and fittings on our Snoqualmie-bound trucks so we’re not ordering parts and making you wait.
Common Air Duct Cleaning Problems We See in Snoqualmie Homes
- Mold staining from heating-season condensation. Snoqualmie’s 60-inch rain year and persistent marine layer mean ducts stay damp inside for months. We regularly find black or green staining on the interior of metal trunk lines, especially in homes where the furnace runs hard from October through April without a whole-house dehumidifier.
- Crushed or disconnected runs in older downtown homes. The early-1900s mill-town houses near Snoqualmie Falls were retrofitted with ductwork decades ago, often run through crawl spaces with inadequate clearance. Our camera catches flex duct compressed against joists or completely separated at the collar, which explains why the back bedroom never gets warm.
- Moisture trapping in tight Ridge construction. Snoqualmie Ridge’s 2010s-era builds are sealed tight for energy efficiency, but that same tightness traps humidity from cooking, showers, and respiration with nowhere to escape except the HVAC system. Ducts in these homes show mold staining within just a few years, much faster than in the leakier vintage homes.
- Heavy biological loading at return-air intakes. Snoqualmie’s wet climate means outdoor mold spores and allergens are present year-round, not just in pollen season. Return ducts pull this load continuously, and without proper filtration it accumulates on the coil and in the trunk line.
Pricing for Air Duct Cleaning in Snoqualmie, WA
| Service | Typical Range in Snoqualmie |
|---|---|
| Standard residential ductwork cleaning (single system) | $350 – $550 |
| Cleaning with moderate mold staining / HEPA remediation | $450 – $650 |
| Full system with sealing, crushed-run repair, reinstatement | $550 – $850 |
| Standalone video inspection (credited toward work) | $150 – $250 |
| Dryer vent cleaning (add-on or standalone) | $125 – $225 |
What moves a Snoqualmie job toward the higher end: homes with original or retrofitted ductwork requiring camera inspection and repair, extensive mold staining needing source removal with HEPA containment, or multiple HVAC zones. What keeps it lower: newer, accessible ductwork in good structural condition with straightforward contamination. We price by the system, not by the vent, and we put the number in writing before any work starts. Call (361) 326-5060 for a free estimate.
We Also Serve Cities Near Snoqualmie
Our Air Duct Cleaning crews regularly work in North Bend, Issaquah, Hobart, and Sammamish, and we understand how the rain-shadow effect shifts conditions as you move east or west through the valley. Whether you’re in a 1970s Issaquah rambler or a new Sammamish build, the same Garrison Standard applies: arrive inside the window, price in writing, complete the job by the book, leave the site clean.
Serving Snoqualmie, WA - Our Local Coverage Area
We’re based in the Snoqualmie 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 in Snoqualmie
Snoqualmie sits on the wet west slope of the Cascades with roughly 60 inches of annual rain and a persistent marine layer that keeps ambient humidity high year-round. During heating season, warm air flowing through cool metal ductwork creates condensation on interior surfaces, and that moisture feeds mold and mildew growth that dry-side cities simply don’t experience at the same rate. Call (361) 326-5060 for an inspection if you’re noticing musty odors when the furnace runs.
Snoqualmie Ridge’s tight, modern construction traps interior moisture so effectively that ducts often show mold staining within just a few years, faster than in older, leakier homes where some humidity escapes through gaps in the building envelope. The moisture has nowhere to go except the HVAC system, and without proper duct sealing and balanced ventilation, microbial growth accumulates quickly. We inspect Ridge homes with the same thoroughness as century-old downtown properties, and we often find that sealing is the real fix.
We find retrofitted ductwork that was never sized for modern forced-air systems, with runs that are too narrow for adequate airflow, crushed against joists in crawl spaces, or completely disconnected at the collar. A homeowner on the Ridge called us about a musty smell that returned every October when the heat kicked on. Our tech pulled the registers and ran a camera inspection: the trunk line had visible mold staining from years of condensation, and the upstairs run had been crushed against a joist during original construction. We ran source removal under negative pressure with HEPA filtration and agitation tools, then sealed the crushed run and reinstated the air handler connection – the smell hasn’t come back through a full wet season.
Cleaning removes existing contamination but doesn’t stop new moisture from entering unsealed ductwork. In Snoqualmie’s climate, unsealed runs draw humid crawl space or attic air into the system, and that moisture condenses on cool duct walls during heating season. We seal with mastic at joints, collars, and penetrations, then verify with a pressure test, because a sealed system stays clean longer and performs more efficiently.
Yes, our work follows NADCA ACR, the Assessment, Cleaning and Restoration standard, which specifies source removal methods, containment procedures, and post-cleaning verification. We document before-and-after conditions with photo and video evidence from your own system, not stock images, so you can see what was removed and what was sealed. The 365-Day Done Right Promise covers all work in writing: if it fails, we return at no charge.
Ready to schedule? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll arrive inside the quoted window, inspect your system with a camera, put the full price in writing before any work starts, and stand behind the result for a full year.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Snoqualmie since 2004.