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.
Air Duct Cleaning Company in Black Diamond, WA
Air duct cleaning in Black Diamond, WA typically costs $350 – $650 for a whole-home system and is scheduled by appointment with a written price locked in before work begins. We’re Hollis Air Duct Cleaning, and our crews handle the unique mix of century-old coal-town housing and newer foothills subdivisions that make every Black Diamond job different. Call us at (361) 326-5060 for a free estimate.
Black Diamond’s history leaves its mark on the ductwork. In the older company-era homes near the historic downtown, we regularly find decades of accumulated coal-dust residue layered in original or retrofitted ducts. Newer builds in master-planned communities face a different problem: pollen from the surrounding Cascade foothills and wildfire smoke that pushes through gaps in the building envelope during hot, dry summers. Our technicians arrive with Rotobrush rotary systems and negative-air equipment from Nikro, and every job gets a written price before we start and the 365-Day Done Right Promise in writing.
Why Black Diamond Homes Are Different
The housing stock here splits into two distinct eras, and the ductwork tells the story. Early-1900s miners’ cottages near the historic mine sites often still run on original or partially upgraded duct systems. When we first disturb those lines, fine coal dust can release into the airstream. Our crews set up containment before agitating anything, protecting both the home and the occupants. In Lawson Hills, Ten Trails, and similar 1990s – 2000s developments, the ductwork is newer but the homes sit exposed to foothills winds that drive pollen, dust, and wildfire particulates deep into the system.
Climate plays its part too. Wet, mild winters with frequent rain and occasional valley flooding raise indoor humidity, creating conditions for mold spores to colonize duct interiors. Summers bring the opposite threat: hot, dry conditions and wildfire smoke from nearby Cascade forests that infiltrates through every gap. Black Diamond’s position in the foothills means temperature swings and pressure differentials that stress duct seams and joints more than valley-floor homes experience. We see the results in our inspections: separated flex duct, compromised mastic seals, and blower compartments loaded with fine particulates that standard furnace filters never catch.
Our Main Black Diamond Services
Black Diamond homeowners call us most often for these three services, each handled with The Garrison Standard: arrive inside the window, price in writing, complete the job by the book, leave the site clean.
Air Duct Cleaning in Black Diamond
We clean the full supply and return network with a Rotobrush rotary brush system and Nikro negative-air machine, pulling loosened debris out of the home rather than redistributing it. In Black Diamond’s older homes, we start with containment protocols for coal-dust residue; in newer subdivisions, we focus on pollen and wildfire particulate loads. Every job includes before-and-after photos of your own ducts. Air Duct Cleaning in Black Diamond is priced by the system, not by the vent, with the total written down before we touch anything.

Dryer Vent Cleaning in Black Diamond
Dryer vent cleaning here means handling the long runs common in both historic homes with retrofitted laundry spaces and newer two-story layouts in developments like Ten Trails. Lint accumulation in extended or multiple-bend runs is a genuine fire hazard, and we treat it that way. Our technicians inspect the full length with a camera when access allows, then clean with rotary tools and verify airflow recovery. Dryer Vent Cleaning in Black Diamond includes the 365-Day Done Right Promise: if airflow drops again within a year, we return at no charge.

Duct Sealing in Black Diamond
Duct sealing addresses the leaks and separated seams we find in both aging coal-era systems and newer homes where foothills wind pressure has worked joints loose over time. We apply duct sealing mastic and mechanical fasteners at every compromised point, then pressure-test to verify the seal. In Black Diamond’s climate, sealed ducts mean less moisture intrusion in winter and less smoke infiltration during wildfire season. Duct Sealing in Black Diamond is priced as a flat system rate, agreed in writing before work starts.

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 Black Diamond
We stock parts and filtration products from Aprilaire, Abatement Technologies, and Guardsman for local Black Diamond jobs, with Honeywell media filters available for common furnace retrofits. Most replacement components arrive within 24 hours through our Seattle office coordination. See our brands for the full equipment roster.
Pricing for Air Duct Cleaning Company in Black Diamond, WA
| Service | Typical range in Black Diamond |
|---|---|
| Whole-home air duct cleaning (single system) | $350 – $650 |
| Whole-home air duct cleaning (two systems) | $550 – $950 |
| Dryer vent cleaning (standard single run) | $120 – $200 |
| Dryer vent cleaning (long run or roof termination) | $180 – $280 |
| Duct sealing (single system, spot repair) | $400 – $700 |
| Duct sealing (single system, comprehensive) | $800 – $1,400 |
| HVAC blower compartment cleaning | $75 – $150 |
| Register/grille deep cleaning (add-on) | $8 – $15 per register |
Prices in Black Diamond push toward the higher end when we’re working in older homes with limited access to duct chases, extensive coal-dust containment needs, or multiple system zones. The price we write down before work starts is the price you pay. No per-vent add-ons, no equipment surcharges, no adjustments at the door.
Neighborhoods We Serve in Black Diamond
We schedule Black Diamond appointments with routing that keeps our technicians in the foothills area rather than bouncing back to metro corridors. Most homeowners book a morning or afternoon window, and we call ahead when we’re thirty minutes out.
- Historic Downtown / Coal Mine Road area
- Lawson Hills
- Ten Trails
- Morganville
- Cedar Grove
Service Area – Cities Near Black Diamond
Our crews work the full Cascade foothills corridor and adjacent valley communities. We regularly schedule alongside Black Diamond appointments in Enumclaw, WA, Maple Valley, WA, Hobart, WA, and Kent, WA. Dispatch and scheduling are coordinated from our Seattle office; technicians serve Black Diamond locally without the delays of crews routed from distant hubs.
Serving Black Diamond, WA - Our Local Coverage Area
We’re based in the Black Diamond 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 Black Diamond
No permit is required for standard residential air duct cleaning or dryer vent cleaning in Black Diamond. Duct sealing that involves modifications to the HVAC plenum or structural framing may need review; we flag any job that requires permit coordination before we quote. Call (361) 326-5060 and we’ll confirm your specific situation.
Most Black Diamond HOAs, including those in Ten Trails and Lawson Hills, do not restrict indoor duct cleaning appointments. Some require vendor proof of insurance; we carry general liability and workers’ compensation documentation and can provide a certificate on request. We recommend notifying your HOA of the appointment window to avoid gate or access issues.
Yes, we clean and seal original ductwork in Black Diamond’s company-era homes regularly. We add containment for coal-dust release and inspect for asbestos-containing materials before disturbing anything pre-1980. If we find conditions that require abatement referral, we stop, explain, and help you identify the right specialist. Call (361) 326-5060 to discuss your home’s age and layout.
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 Black Diamond Customers Say
"No sales pitch. Told me which parts of the system were fine and only cleaned what needed it."
- Ted L."They checked each section with a camera and showed me the dust before and after. Thorough and honest."
- Nicole H."Duct sealing along with the cleaning cut our summer bill. Straight talk and fair price."
- Gwen O.




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