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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After
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Before
AfterFast, Reliable Air Duct Cleaning Across Mercer Island
Air duct cleaning in Mercer Island typically runs $350 – $650 for a whole-house residential system and is usually completed in one visit. Most Mercer Island homes need it every three to five years, though the island’s heavy tree canopy and marine humidity push some properties toward the shorter end of that range.
We’re Hollis Air Duct Cleaning, and our crews have been crossing the I-90 bridge to Mercer Island since 2004. Dispatch and scheduling are coordinated from our Seattle office, but the technicians who arrive at your door live in the metro area and know the island’s roads, parking restrictions, and housing stock. We’ve cleaned ducts in 1950s ramblers off East Mercer Way, in rebuilt interiors near Mercerdale Park, and in condo stacks along the shoreline. Wherever you are on the island, we arrive inside the quoted window, price the job in writing before touching anything, and leave the site clean. That’s The Garrison Standard, and it’s how we work on every Mercer Island job. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is Mercer Island’s Preferred Air Duct Cleaning Company
Our reputation on Mercer Island was built on showing up and doing what we said we’d do. Homeowners here have told us the same story: they booked a cheap coupon deal, the crew arrived late or not at all, and the final bill had nothing to do with the phone quote. We don’t work that way. The price is written down before any work starts, and it does not move at the door.
Our technicians are background-checked and uniformed. You know who is walking into your home before they arrive. And our phones are answered by a live person, 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule your Air Duct Cleaning appointment.
Every job we do on Mercer Island carries 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. That’s backed in writing on every invoice, not something we mention once and forget.
Commercial Air Duct Cleaning in Mercer Island
Commercial Air Duct Cleaning in Mercer Island covers office buildings, retail spaces, medical clinics, and multi-unit residential properties where the HVAC system serves more than a single household. These systems run longer hours, move more volume, and accumulate debris differently than residential setups. In Mercer Island, commercial duct cleaning typically runs $800 – $2,500 depending on system size, access difficulty, and whether video inspection is included. Most commercial clients on the island schedule every two to three years, or after any renovation that generated construction dust.
Multi-Unit and Condo Systems
Many Mercer Island commercial properties are condo or apartment buildings with shared air handlers and duct runs. We coordinate with building management, work within HOA scheduling windows, and document our work for maintenance logs. Our crew has cleaned shared systems in buildings from the 1970s shoreline developments to newer stacked flats near the town center.
Post-Renovation and Construction Cleanout
Interior rebuilds are common on Mercer Island, and new drywall dust, sawdust, and insulation particles migrate straight into the duct system. We use Nikro negative-air machines to establish contained pressure zones, then agitate and extract debris without redistributing it into occupied spaces.
Air Duct Cleaning Services in Mercer Island
Air Duct Cleaning Services in Mercer Island include full-system cleaning of supply ducts, return ducts, and the plenum connections at your air handler, plus optional video inspection to document before-and-after conditions. A typical whole-house residential job on the island runs $350 – $650 for a single-system home, with larger homes or systems with multiple zones toward the upper end. We do not price per vent. One flat price per system, agreed before work starts.
Residential Whole-System Cleaning
Our residential process starts with a camera inspection where accessible, then source removal using Rotobrush rotary brush systems on the supply side and negative-air extraction on the returns. For Mercer Island’s older shoreline homes with crawlspace returns, we inspect the plenum for fir needle and moss buildup that standard register cleaning never reaches.
Video Inspection and Documentation
We offer video inspection as an add-on to any residential or commercial job. You see what we see: needle mats, mildew streaks, dust loading, or damaged flex duct. After cleaning, we run the camera again. The footage belongs to you, and it’s the proof that the work happened.
What happens when you call
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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 Mercer Island
Our equipment roster includes Rotobrush rotary brush systems and Nikro negative-air machines for the cleaning itself, plus filtration and sealing products from Honeywell, Aprilaire, and Abatement Technologies. We don’t use hardware-store shop vacs and call it duct cleaning. These are the same tools commercial crews use, maintained on schedule and explained in plain terms while we’re in your home. For Mercer Island customers, we keep common fittings and replacement media in stock, so if we find a compromised filter housing or a failed seal during cleaning, we can address it without ordering parts and rescheduling. Fast turnaround matters on an island where every trip across the bridge adds time.
Common Air Duct Cleaning Problems We See in Mercer Island Homes
- Crawlspace return plenums choked with fir needles and moss. Shoreline ramblers and split-levels from the 1950s – 70s draw return air through foundation vents, and by late spring our techs commonly find green moss mats and Douglas-fir needle buildup in the plenum before the filter ever sees it. This chokes airflow, strains the blower motor, and recirculates spores.
- Shared dryer vent stacks in condos and apartments. Mercer Island’s multi-unit buildings often route dryer exhaust through a common stack. The lint trap in each unit looks fine while the shared pathway behind the wall keeps accumulating. We clean the full run from roof cap to connection point, not just the accessible section.
- Sag points in retrofitted flex duct. The island’s 1990s – 2010s rebuilds frequently use flex duct threaded through older framing. Needle debris, humidity, and mildew collect at low points where the duct sags. A register-only cleaning misses these entirely; we inspect the full line where access allows.
- Mildew and organic growth from marine humidity. Mercer Island sees 35+ inches of rain annually and year-round humidity. Duct systems in crawlspaces and unconditioned attics develop mildew streaks that standard dust removal doesn’t address. We identify these conditions during inspection and note them in our written report.
Pricing for Air Duct Cleaning in Mercer Island, WA
Here’s what whole-system air duct cleaning costs in the Mercer Island market:
- Small to medium residential system (single zone, up to 15 vents): $350 – $480
- Large residential system (multiple zones, 16 – 25 vents): $480 – $650
- Commercial system or multi-unit building: $800 – $2,500
- Video inspection add-on: $75 – $150
- Dryer vent cleaning (whole run, not just trap): $120 – $220
These are whole-system prices, not per-vent teaser rates that balloon once the van is in your driveway. What moves the number: system size, number of zones, access difficulty (crawlspace work takes longer than basement access), and whether we find conditions that need additional attention like damaged flex duct or failed seals. We inspect first, write the price down, and get your approval before any work begins. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Mercer Island
Our crews cross the I-90 bridge daily to serve Mercer Island and the surrounding communities. We also work in Bellevue, Medina, Seattle, and Renton. Same standards, same written pricing, same 365-Day Done Right Promise at every stop.
Serving Mercer Island, WA - Our Local Coverage Area
We’re based in the Mercer Island 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 Mercer Island
Mercer Island’s dense tree canopy produces some of the highest pollen and Douglas-fir spore loads in the metro, and many older homes draw return air through crawlspace foundation vents that pull in needles, moss, and organic debris. Mainland Seattle homes with sealed basement returns rarely show the same plenum loading we see here by late spring. If your home is a 1950s – 70s rambler or split-level near the water, your returns are likely working harder than the filter rating suggests. Call (361) 326-5060 and we’ll inspect the plenum with a camera to show you exactly what’s in there.
Yes. We coordinate with your building management or HOA, work within their scheduling and access requirements, and document our work for maintenance logs. For shared systems, we establish containment at the air handler and clean the common duct runs without disrupting other units. We’ve done this in shoreline condo buildings from the 1970s and in newer stacked flats near the town center. Call (361) 326-5060 to discuss your building’s specific setup.
Our van carries contained, portable equipment that sets up at your property line or driveway. We don’t roll long hoses across sidewalks or block narrow lanes. For homes on East Mercer Way and other tight shoreline roads, we arrive with the exact footprint mapped out and park to minimize traffic impact. If your building has restricted visitor parking, we coordinate with you or management beforehand so there’s no delay at arrival.
Shared dryer vent stacks route multiple units through one common pathway. The lint trap in your unit catches surface lint, but the shared run behind the wall keeps accumulating from every unit on the line. We clean from the roof cap down to each connection point, using rotary brushes and negative-air extraction to clear the full run. This requires roof or attic access, which we coordinate with building management. The alternative is a slowly choking exhaust that extends dry times and creates a fire pathway.
Yes. Our source-removal methods, containment protocols, and equipment specifications align with NADCA ACR guidelines for residential and commercial duct cleaning. We use mechanical agitation plus negative-air extraction, inspect accessible components, and document conditions in writing. The 365-Day Done Right Promise backs every job: if our work fails within a year, we return and make it right at no charge, including a free second visit. Call (361) 326-5060 for specifics on your system.
Ready to see what’s in your ducts? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll give you a written price before any work starts, show you before-and-after photos from your own system, and back the work with our 365-Day Done Right Promise. That’s how we do it on Mercer Island. That’s The Garrison Standard.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Mercer Island since 2004.