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 Kent
Duct sealing in Kent typically runs $450 – $1,200 for a whole-home seal of supply and return ductwork, with most jobs completed in a single scheduled visit. Our crews dispatch from the Seattle office and serve Kent neighborhoods directly, including East Hill, Panther Lake, and the Kent Valley corridor. Call (361) 326-5060 for a free written estimate.
We’ve worked in Kent long enough to know the local housing stock: mid-century ramblers with original sheet-metal ducts, 1980s split-levels with asbestos-wrapped joints, and 1990s two-story tracts with flex runs that sag in crawlspaces. That familiarity matters because sealing ductwork in Kent isn’t the same job as sealing it in drier climates or newer construction. The Green River Valley’s damp marine air, winter flooding, and high indoor humidity create conditions that can turn a standard seal into a mold trap if the technician doesn’t understand what they’re looking at. Our Duct Sealing team treats every Kent job with that context in mind.
Why Hollis Air Duct Cleaning Is Kent’s Preferred Duct Sealing Company
Hollis Air Duct Cleaning has been part of the Garrison Partners family since 2004. We operate under The Garrison Standard: written prices before any work starts, background-checked uniformed technicians, and a 365-Day Done Right Promise backed in writing on every job. If the seal fails within a year, we return and make it right at no charge, including a free second visit.
In Kent specifically, we’ve built our reputation on showing up inside the quoted window and pricing the job before we touch anything. No estimates that balloon once we’re inside your crawlspace. Kent homeowners have seen enough bait-and-switch pricing from out-of-town crews to know the difference. Our technicians carry Rotobrush and Abatement Technologies equipment, explain what they’re finding in plain terms, and leave the site clean. Phones are answered by a live person 24 hours a day, 7 days a week, so you’re not waiting until Monday to schedule.
Duct Sealing Services in Kent
Duct Sealing Services in Kent address the leaks, gaps, and disconnected joints that waste heated and cooled air in your HVAC system. A typical whole-home seal in Kent runs $450 – $1,200 depending on duct accessibility, the extent of damage, and whether prior flooding requires remediation before sealing can begin. Most Kent homeowners notice they need sealing when rooms stay unevenly heated, energy bills spike, or musty odors persist despite filter changes.
Supply and Return Joint Sealing
We seal metal-to-metal connections with mastic compound and fiberglass mesh, then pressure-test the system to verify seal integrity. In Kent’s older homes, we often find original sheet-metal ducts with corroded joints that need cleaning and rust treatment before any sealant will adhere properly.
Flex Duct Repair and Connection Sealing
Flexible duct runs common in 1990s Kent tracts sag, tear at connections, or fill with debris. We replace damaged flex sections and seal new connections with mechanical fasteners and mastic, not tape alone, so the repair survives the next humid season.
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.
Duct Insulation in Kent
Duct Insulation in Kent prevents condensation on cool supply ducts running through hot, humid crawlspaces and attics. A typical insulation job in Kent runs $600 – $1,800 depending on linear feet of ductwork and insulation R-value. Kent’s high indoor humidity, fed by the Green River Valley’s damp marine air, makes uninsulated ducts sweat continuously during cooling season. That moisture drips onto framing, promotes mold, and degrades the duct seal beneath.
Crawlspace Duct Wrapping
We wrap accessible supply ducts with foil-faced fiberglass insulation, sealed at seams with mastic, to maintain air temperature and prevent condensation. In Kent’s flood-prone crawlspaces, we use moisture-resistant materials and document pre-existing water damage before wrapping so insurers can distinguish new work from old.
Attic Duct Insulation Upgrades
Attic ducts in Kent’s 1980s split-levels often carry minimal original insulation. We add R-6 or R-8 wrap to reduce thermal loss and prevent summer condensation that drips through ceiling registers. Every upgrade gets a written price before work begins and photos for your records.
Trusted Brands We Service in Kent
We stock parts and materials from Aprilaire, Abatement Technologies, and Guardsman for Kent homeowners, which means faster turnaround on repairs and no waiting for special orders. Our Abatement Technologies HEPA-negative-air systems handle post-flood decontamination in Kent’s water-damaged crawlspaces. Guardsman filtration products integrate with sealed duct systems to maintain air quality after the job is done. For rotary brush cleaning and debris removal, we deploy Rotobrush equipment. We keep common sizes of mastic, fiberglass mesh, and flex duct in stock so most Kent sealing jobs are completed in one visit.
Common Duct Sealing Problems We See in Kent Homes
- Rusted mid-century sheet-metal with loose asbestos-wrapped joints. Kent’s post-war ramblers and 1970s split-levels often have original ducts that corrode from decades of valley humidity. Sealing over rust without cleaning and treating the metal traps moisture and allows mold to bloom behind the sealant.
- Water-damaged flex duct in East Hill and Panther Lake crawlspaces. After heavy rain, these ducts carry silt and biological growth that standard vacuuming won’t remove. Taping or masticing damaged flex is a temporary fix that fails at the next flood and gives insurers grounds to reject a claim.
- Disconnected or sagging flex runs in 1990s two-story tracts. Kent’s suburban expansion-era homes have long flex duct runs that sag between supports, creating low spots where dust and moisture collect. Sealing the connections without addressing sagging guarantees recurrence.
- Sealing damp ducts after flooding without moisture mapping. We see this after DIY attempts and cut-rate contractor jobs in the Kent Valley: sealant applied to still-wet metal or flex, leading to musty odors within weeks and no documentation for insurance.
Pricing for Duct Sealing in Kent, WA
Whole-home duct sealing in Kent typically costs $450 – $1,200. Duct insulation runs $600 – $1,800. Post-flood remediation and sealing, which requires HEPA-negative-air cleaning, moisture mapping, and camera inspection before sealant is applied, ranges $800 – $2,500 depending on the extent of water damage and linear feet of affected ductwork.
What moves the price: duct accessibility (crawlspace height, attic hatch location), extent of rust or flood damage requiring pre-cleaning, whether asbestos-wrapped joints need encapsulation before sealing, and whether flex sections require replacement rather than repair. We give you one flat price per system, agreed in writing before any work starts. No per-vent pricing, no add-ons at the door. Every Kent job includes before-and-after photos of your own ducts. Call (361) 326-5060 for a free written estimate.
We Also Serve Cities Near Kent
Our crews work throughout south King County. We provide Duct Sealing in Kent and also serve Renton, Auburn, Federal Way, and Maple Valley with the same written pricing, background-checked technicians, and 365-Day Done Right Promise.
Serving Kent, WA - Our Local Coverage Area
We’re based in the Kent 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 Kent
Ducts can be sealed when camera inspection shows intact metal or flex with surface moisture and debris but no structural degradation, and when moisture mapping confirms materials are dry to industry standards. If standing silt has compromised flex walls or rust has perforated sheet metal, replacement is required. After a January rain event, a Panther Lake homeowner on a 1972 split-level called us with a musty smell and a blower motor cycling on high static. We camera-inspected the crawlspace duct runs, found standing silt in low spots and wet flex connections, and used Abatement Technologies HEPA filtration under negative pressure to remove debris, sanitize the affected runs, and reseal the joints; the homeowner forwarded our moisture readings and before/after photos to their insurer, and the claim covered the replacement of two unsalvageable duct sections. Call (361) 326-5060 to schedule inspection.
We provide dated camera inspection video, moisture meter readings with location mapping, and before/after photos of each duct section. This documentation package distinguishes cleanable from replaceable damage and establishes pre-existing conditions versus new flood impact. Insurers in Kent’s Green River Valley flood zone regularly accept our documentation for claim processing. Call (361) 326-5060 and we’ll explain what’s included at no charge with every inspection.
East Hill and Panther Lake sit on clay-heavy soils with poor drainage and aging perimeter foundations that crack and settle. Combined with the Green River Valley’s high water table and increasingly intense winter rain events, water enters crawlspaces through foundation gaps and overtops existing drainage. Ductwork routed through these unsealed crawlspaces becomes a collection channel for silt and moisture. Call (361) 326-5060 for crawlspace duct assessment.
Sealing reduces humidity indirectly by preventing conditioned air loss and stopping crawlspace moisture from entering the supply stream, but it does not remove humidity on its own. In Kent’s climate, we often pair sealing with proper duct insulation and recommend Guardsman filtration to maintain dry, clean air distribution. For homes with chronic humidity, we assess whether the HVAC system is properly sized for the valley’s latent load. Call (361) 326-5060 for evaluation.
We use Abatement Technologies HEPA-negative-air machines for pre-seal decontamination, Rotobrush rotary systems for duct cleaning, and Aprilaire and Guardsman filtration products for post-seal air quality maintenance. Mastic and mechanical fasteners come from trade suppliers, not hardware stores, and our technicians carry moisture meters and inspection cameras as standard. Call (361) 326-5060 to ask about specific equipment for your job.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Kent and the Green River Valley under The Garrison Standard since 2004.