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 Federal Way
We’re the crew Hollis Air Duct Cleaning sends to Federal Way when homeowners call about musty air, rooms that won’t heat evenly, or utility bills that climb for no clear reason. Dispatch and scheduling run through our Seattle office, but our technicians live and work in the South King County corridor, so we know the difference between a 1968 rambler off Steel Lake and a 2005 townhome near the Commons. That local knowledge matters because the duct problems we find in Federal Way aren’t the same ones we find inland. Call (361) 326-5060 and we’ll quote a written price before any work starts.
Why Hollis Air Duct Cleaning Is Federal Way’s Preferred Duct Sealing Company
We’ve been part of the Garrison Partners family since 2004, and our Federal Way customers know what that means: a technician who shows up uniformed and background-checked, a price written down before tools come out, and a 365-Day Done Right Promise backed in writing on every job. Our Duct Sealing team doesn’t negotiate at the door or discover “surprise” problems that weren’t in the original quote.
Federal Way homeowners aren’t looking for the lowest teaser coupon. They’re looking for a crew that won’t ghost them, won’t track mud through the house, and won’t pretend a fogging treatment fixes what is actually a condensation problem in original galvanized ductwork. We answer the phone live, 24 hours a day. No voicemail loops. No callback queues.
Our equipment roster includes Rotobrush rotary brush systems, Nikro negative-air machines, and filtration from Honeywell and Guardsman, the same tools commercial crews use. We explain what each does and why it matters to the air moving through your home.
Air Duct Sealing in Federal Way
Air Duct Sealing in Federal Way means closing the gaps, disconnected joints, and deteriorated seams in your forced-air system so heated and cooled air actually reaches the rooms it was meant for. In this market, we see two distinct jobs: sealing accessible ductwork in basements and crawl spaces on older homes, and sealing tighter, more complex runs in newer townhomes and multi-family builds. A typical whole-system sealing job in Federal Way runs $450 – $1,200 depending on accessibility, duct material, and whether we need to address biological growth first.
When Sealing Alone Isn’t Enough
We won’t seal over active mold or mildew. In Federal Way’s damp climate, particularly in the Steel Lake and Pacific Highway South corridors, original galvanized runs often sweat at the joints and grow surface biofilm. Sealing traps that growth behind mastic. The smell returns. We remove it first, dry the system, then seal.
What Sealing Actually Fixes
Loose joints in flexible duct, gaps at the plenum connection, and separated runs in crawl spaces. In Federal Way’s 1960s – 1990s housing stock, these failures are common where early flexible duct or thin galvanized metal has aged through wet winters. Sealing restores static pressure and stops the blower from working overtime.
Duct Sealing Services in Federal Way
Duct Sealing Services in Federal Way cover inspection, access, mechanical cleaning where needed, joint sealing with mastic or metal-backed tape, and post-seal pressure testing to verify the fix. We don’t quote per-vent pricing because that’s how bait-and-switch starts. One flat price per system, agreed before work begins, based on what we find during your free estimate. For most Federal Way single-family homes, Duct Sealing Services fall in the $450 – $1,200 range; townhomes and apartments with tighter access typically run $350 – $800.
Source Removal Before Sealing
Our field crews carry Rotobrush agitation tools and Nikro negative-air HEPA systems for a reason. In Federal Way, we regularly pull jobs where a previous company fogged the ducts but left the condensation-soaked insulation and bio-growth in place. The smell came back within a season. We remove the source, then seal.
Pressure Testing After the Job
Every sealing job gets a post-work static pressure check. If the numbers don’t improve, we find out why before we leave. That’s The Garrison Standard: price in writing, job done by the book, site left clean.
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 Federal Way
We stock parts and filtration products from Honeywell, Guardsman, and Abatement Technologies for Federal Way customers, which means faster turnaround when your system needs a media cabinet upgrade or specialized sealing materials. After we seal failing joints in a damp-climate home, we often recommend a Honeywell media filter with a higher MERV rating to capture the fine particulate that marine air carries in. No special orders. No waiting on shipping from out of state. Our technicians carry the equipment on the van.
Common Duct Sealing Problems We See in Federal Way Homes
- Condensation-sweating galvanized joints in Steel Lake ramblers. Original 1960s – 70s duct runs in this neighborhood were installed with minimal insulation. Cold marine air hits warm supply metal, water forms, and mildew follows. Sealing without drying and removing that growth first locks the problem behind mastic.
- Disconnected flexible duct in crawl spaces beneath Pacific Highway South split-levels. The damp ground-level air degrades early flexible duct faster than in drier climates. We find fully separated runs blowing heated air into the crawl space instead of the bedroom above.
- Undersized return ducts causing negative pressure and microbial recontamination. Federal Way’s older ramblers often have return paths too narrow for modern blower motors. Low static pressure pulls damp outside air through every gap, re-wetting sealed joints from the inside within a season or two.
- Fogging “sanitiser” treatments that leave the real problem untouched. We’ve cleaned up after competitors who charged for antimicrobial fogging but never addressed the condensation-soaked insulation or actual bio-growth. The homeowner paid twice. We don’t sell fogging as a substitute for mechanical removal.
Pricing for Duct Sealing in Federal Way, WA
Whole-system duct sealing in Federal Way typically runs $450 – $1,200 for single-family homes and $350 – $800 for townhomes or apartments with tighter access. What moves the number: crawl space versus basement access, whether we need to remove biological growth before sealing, the linear footage of duct involved, and whether the plenum connection needs rebuild or just sealant. We don’t do per-vent pricing. We don’t do teaser coupons that balloon at the door. One flat price per system, written down before any work starts, and covered by our 365-Day Done Right Promise. If the seal fails within a year, we come back and make it right at no charge, including a free second visit. Call (361) 326-5060 for a free estimate. We’ll look at your system and give you the exact number.
We Also Serve Cities Near Federal Way
Our crews work throughout South King County. If you’re in Auburn, Pacific, Milton, or Kent, the same technicians, same equipment, and same written pricing apply. We schedule Duct Sealing in Federal Way and surrounding cities from our local dispatch, so you’re not waiting on a crew driving down from Seattle traffic.
Serving Federal Way, WA - Our Local Coverage Area
We’re based in the Federal Way 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 Federal Way
Federal Way sits in a lowland bowl off Puget Sound where marine air pushes through the Steel Lake and Pacific Highway South corridors, so original 1960s – 70s galvanized duct runs in ramblers here sweat and grow mildew at the joints long before ducts in drier inland suburbs do. The combination of cold metal, minimal original insulation, and persistent dampness creates conditions we don’t see in Auburn or Kent at the same frequency. Call (361) 326-5060 if you’re catching that smell when the furnace kicks on. We’ll camera the system and show you what’s actually growing in there.
Sealing stops the smell only if the biological growth causing it is removed and the duct is dried first. Fogging sanitiser without source removal is a temporary cover-up that leaves condensation-soaked insulation and active mold in place. In Federal Way’s damp climate, that smell returns within a season because the moisture source was never addressed. We use Rotobrush agitation and Nikro negative-air HEPA extraction to remove the growth, then seal. Call (361) 326-5060 for an inspection and we’ll tell you which approach your system actually needs.
We pulled a call from a 1968 rambler a few blocks off Steel Lake where the homeowner kept getting a musty odor at the supply registers whenever the furnace kicked on. After a camera inspection, we ran agitation tools and HEPA filtration under negative pressure through the supply and return ducts, found the original galvanized runs were undersized with barely any insulation and heavy surface growth near the plenum, then sealed the failing joints and connected a Honeywell media cabinet with a higher MERV rating at the air handler. The odor cleared and the blower motor stopped short-cycling on the restricted return. Every Federal Way job follows the same sequence: inspect, remove source contamination, dry, seal, verify pressure improvement. Call (361) 326-5060 to schedule yours.
Yes, though access is often through smaller service openings or by temporarily dropping sections of ceiling in utility closets. Townhome duct runs in Federal Way’s newer stock are typically flexible duct with tighter bends, so we use smaller-diameter inspection cameras and specialized sealing tools that fit where standard equipment won’t. The price range for these jobs is typically $350 – $800 depending on linear footage and access points. Call (361) 326-5060 and we’ll assess your specific layout.
After sealing in Federal Way’s marine climate, we typically recommend a MERV 11 or 13 media filter from Honeywell or Guardsman installed at the air handler. That captures the fine particulate and mold spores that damp air carries without restricting airflow on older blower motors. We match the filter to your system’s static pressure capacity so you don’t trade one problem for another. Call (361) 326-5060 and we’ll size it correctly for your equipment.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Federal Way since 2004 as part of the Garrison Partners family.