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 Duct Sealing Across Spokane
Duct sealing in Spokane typically runs $450 – $1,200 for a whole-house system, with most rural properties landing in the $600 – $950 range once we account for outbuilding air handlers and the heavier contamination loads that come with gravel-road living. We’re the Duct Sealing team at Hollis Air Duct Cleaning, and we’ve been driving to Spokane jobs from our Seattle coordination office since 2004. Our crews know the difference between a Browne’s Addition Victorian with original galvanized trunks and a Moran Prairie ranch with aging flex duct, and we price each in writing before touching anything. Call (361) 326-5060 for a free estimate.
Spokane County’s rural outskirts – places like the unpaved stretches off Cheney-Spokane Road and the well-and-septic tracts toward Chattaroy and Green Bluff – load ductwork with road dust, field pollen, and wood-stove ash at a rate urban Browne’s Addition never sees, and outbuildings with their own air handlers need sealing scheduled as separate systems. If you’re on acreage with a gravel driveway and a wood stove, your ducts are working harder than the city average, and the service interval should reflect that.
Why Hollis Air Duct Cleaning Is Spokane’s Preferred Duct Sealing Company
We’ve built our reputation in Spokane on showing up inside the window, pricing in writing, and leaving the site clean. That’s The Garrison Standard, and it’s how every Hollis location operates, including ours serving Spokane and the surrounding county.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Phones are answered by a live person 24 hours a day, 7 days a week – no voicemail loops, no callback queues, no waiting until Monday for a scheduling question.
The 365-Day Done Right Promise covers every job we do in Spokane. If the work fails within a year, we come back and make it right at no charge, including a free second visit. We put that in writing on every invoice. Where other outfits compete on the lowest teaser price, we compete on discipline: the price is written down before any work starts, and it does not move at the door.
Our equipment roster includes Nikro negative-air machines, Rotobrush rotary brush systems, and sealing products from Honeywell and Guardsman – the same tools commercial crews use, explained in plain terms on every job.
Duct Repair in Spokane
Duct Repair in Spokane means fixing the torn, separated, or corroded sections that let heated and cooled air escape before it reaches your rooms. In Spokane’s market, most duct repair jobs run $280 – $650 depending on accessibility and whether we’re working with original galvanized steel, mid-century flex, or modern sheet metal. We see the most repair calls after winter inversions, when homeowners notice rooms that won’t heat evenly and realize conditioned air has been leaking into attics and crawl spaces for months.
Corroded Galvanized Trunks
Original galvanized steel ducts in Spokane’s pre-1950 housing stock corrode from the inside out, especially where wood-heat soot has migrated past failing seams. We cut out the damaged section, fabricate a replacement from matching gauge metal, and seal with Guardsman mastic rated for temperature cycling.
Torn Flex Duct in Crawl Spaces
Mid-century ranch homes in Moran Prairie and South Hill often have early flex duct that’s become brittle or torn where it passes over joists. We replace the damaged run with modern insulated flex, support it properly to prevent future sagging, and seal both ends with mechanical fasteners and mastic, not foil tape that will fail in the next temperature swing.
Air Duct Sealing in Spokane
Air Duct Sealing in Spokane closes the gaps, joints, and seams that leak conditioned air into unconditioned spaces. A typical whole-house sealing job in Spokane runs $450 – $1,200, with most homes falling between $600 – $950. Rural properties with outbuilding systems add $180 – $350 per additional air handler. We use a blower-door test or duct-blaster test to measure leakage before and after, so you see the actual CFM reduction in writing.
Mastic Sealing for Metal Ducts
For original galvanized and sheet-metal systems, we apply Guardsman mastic – a water-based sealant that remains flexible through Spokane’s freeze-thaw cycles – to every joint, seam, and penetration. We brush it on thick; thin coats crack. The result is a permanent seal that outlasts any tape product.
Aeroseal for Hard-to-Reach Leaks
When ducts are buried in walls or sealed chases, we offer aerosolized sealant injection that finds and seals leaks from the inside. This works well in Browne’s Addition homes where original brick and plaster make physical access impossible without major demolition.
Trusted Brands We Service in Spokane
We stock parts and sealing products from Honeywell, Aprilaire, and Abatement Technologies for Spokane customers, which means faster turnaround on jobs that would otherwise wait for Seattle supply runs. Our Nikro negative-air machines and Rotobrush agitation tools are maintained to commercial spec, and we carry Guardsman mastic in quantity for the larger rural jobs where original galvanized systems need extensive resealing. If your system uses a specific filtration brand or control board, tell us when you call – we’ll confirm parts availability before we dispatch.
Common Duct Sealing Problems We See in Spokane Homes
- Rural gravel-road dust re-entry. Unsealed plenum and boot joints on homes off Cheney-Spokane Road and toward Chattaroy pull in road dust and field pollen within a single heating season. Sealing without first source-removing the loaded duct just traps grit behind the mastic, so we clean before we seal.
- Wood-heat soot corrosion. Fine, acidic soot from Spokane’s common wood stoves migrates past failing foil-tape patches on original galvanized trunks and corrodes seams from the inside. The leak looks minor until a camera inspection shows the separation.
- Outbuilding systems get skipped. A shop or barn with its own air handler shares the property but not the ductwork. The blower motor pulls unconditioned outdoor dust straight through torn flex and unsealed collars. We schedule these as separate systems with their own sealing passes.
- Gravity furnace octopus ducts in Browne’s Addition. Original 1900s systems have massive, unsealed brick and galvanized ducts that haven’t been cleaned in decades. These require specialized negative-air equipment to handle the volume and fragility, and sealing must be done after thorough source removal.
Pricing for Duct Sealing in Spokane, WA
Whole-house duct sealing in Spokane typically costs $450 – $1,200. Most standard homes with accessible ductwork fall in the $600 – $950 range. Factors that move the needle: number of air handlers (rural properties with outbuilding systems add $180 – $350 each), duct material (original galvanized takes longer to prep than modern sheet metal), accessibility (crawl space work costs more than basement access), and whether we need to clean before sealing (loaded ducts add $300 – $500 for source removal).
We do not quote per-vent pricing. We price per system, in writing, before any work starts. Every estimate is free, and every job carries the 365-Day Done Right Promise. Call (361) 326-5060 for your exact quote.
We Also Serve Cities Near Spokane
Our crews regularly work in Airway Heights, Mead, Medical Lake, and Cheney – anywhere the gravel roads and wood-heat loads match the Spokane pattern. Scheduling and dispatch are coordinated from our Seattle office, but the technicians serving your area live and work locally. Duct Sealing in Spokane and its surrounding communities is what we do.
Serving Spokane, WA - Our Local Coverage Area
We’re based in the Spokane 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 Duct Sealing in Spokane
Every 2 – 3 years for cleaning, with sealing inspected annually. The wood-heat soot and gravel-road dust load is roughly double what you’d see in a city neighborhood, and unsealed joints re-contaminate fast. We recommend a camera inspection every other fall before heating season starts. Call (361) 326-5060 to schedule – estimates are free.
We seal both, priced as separate systems. A shop air handler with its own ductwork pulls unconditioned outdoor air through the same leaks, wasting energy and loading the space with dust. Most rural Spokane County properties with outbuildings add $180 – $350 per additional system. We’ll inspect both and quote each in writing.
Yes, by reducing the infiltration of outdoor particulate and preventing your HVAC system from pulling contaminated air through leaks in return ducts. Sealing won’t stop inversion pollution at your doors and windows, but it closes a major entry path that most homeowners overlook. We measure leakage before and after with a duct-blaster test so you see the improvement.
The scale and fragility. Original octopus gravity systems have massive galvanized trunks and brick plenums that haven’t been touched in decades. We use Nikro negative-air equipment with HEPA filtration to control dust during cleaning, then apply mastic by hand to accessible seams. Some buried sections may need Aeroseal injection. We always inspect with a camera first.
Yes, though early flex duct often needs replacement rather than sealing. The plastic becomes brittle and tears at supports. Where the flex is intact, we seal collars and junctions with mastic and mechanical fasteners. Where it’s degraded, we replace the run with modern insulated flex, properly supported, and seal the new installation. We’ll show you the camera footage and quote both options in writing.
A crew drove out past Green Bluff to a farmhouse off Day-Mount Spokane Road where the homeowner burns wood all winter and the gravel driveway kicks up dust; the original galvanized supply and return ducts in the house were holding a visible mat of ash and grit, so we pulled the registers, ran negative pressure with a HEPA filtration unit, source-removed the trunk lines, and sealed the open joints along the main trunk. In the detached shop, the separate air handler and short duct run got its own pass – sealed boots and a camera inspection that caught a torn flex connector on the supply side. We used Guardsman mastic on the sheet-metal seams and Rotobrush agitation tools through the branches.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Spokane since 2004.