Duct Sealing in Lake Stevens - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Lake Stevens

We’re the crew that handles Duct Sealing in Lake Stevens homes where the real problem isn’t dust, it’s what the Puget Sound dampness does inside your walls. Call (361) 326-5060 and we’ll give you a written price before any work starts.

Call (361) 326-5060

Our dispatch runs out of the Seattle office, but our technicians live and work in Snohomish County. We know the difference between a 2005 subdivision off Soper Hill Road and a 1970s rancher on the lakefront, and we know which one has crushed flex duct at the plenum and which has galvanized steel that’s rusted through. Lake Stevens grew fast in the 1990s and 2000s, and that building boom left a lot of homes with duct systems that were never properly sealed to begin with. We see it every week.

Why Hollis Air Duct Cleaning Is Lake Stevens’s Preferred Duct Sealing Company

We’ve been doing this since 2004. That’s longer than most duct cleaning outfits in Snohomish County have been in business. Our technicians are background-checked, uniformed, and expected to show up inside the quoted window, price the job in writing before touching anything, and leave the site clean. That’s The Garrison Code, and it’s how we work on every job.

Phones get answered by a live person, 24 hours a day, 7 days a week. No voicemail loops. No callback queues. When you’re dealing with a musty smell coming from your registers or a dryer that won’t vent properly, you don’t want to wait until Monday for a return call.

Every repair we make carries the 365-Day Done Right Promise. If the seal fails, if the joint pulls apart, if the problem comes back within a year, we return and make it right at no charge. That’s not a verbal promise. It’s written on every job.

Air Duct Sealing in Lake Stevens

Air Duct Sealing in Lake Stevens means closing the gaps, cracks, and disconnected joints in your forced-air system so the air you’ve already paid to heat or cool actually reaches the rooms it’s supposed to. In this climate, it’s not just about efficiency. It’s about stopping humid outside air from being pulled into your ductwork through leaks, condensing on the metal, and growing mold that your blower then distributes through every room.

Most Lake Stevens homes built between 1990 and 2010 have duct systems that were sealed at the joints with tape that’s now brittle, or with mastic that was applied too thin to survive our wet winters. The older ranchers near downtown and the lakefront often have original galvanized duct with rust holes where rodents have chewed through, or where decades of condensation have eaten the metal. We see both situations regularly.

A typical duct sealing job in Lake Stevens runs $450 – $1,200 for a whole-system seal, depending on accessibility and how much of the ductwork needs attention. Small spot repairs on accessible joints start around $180. We price by the system, not by the vent, and we write it down before we start.

Spot Sealing vs. Full System Seal

Spot sealing makes sense when you’ve got one or two known problem areas: a disconnected flex duct in the attic, a joint that’s pulled apart above the garage, a rust hole in a single trunk line. Our tech locates the leak with a pressure test and camera, seals it with mastic and foil tape or replaces the damaged section, and verifies the fix with another pressure test.

Full system sealing is what we recommend when your ducts are leaking 20% or more of their airflow, which is common in Lake Stevens subdivisions where builder-grade installation left gaps at every register boot and plenum connection. We seal from the air handler to the farthest register, then test to confirm we’ve hit our target.

Attic and Crawlspace Work

Lake Stevens’s wet winters mean attics and crawlspaces stay damp year-round. When we seal ductwork in these spaces, we also inspect for condensation damage and recommend insulation upgrades where the duct is sweating. Sealing without addressing the moisture problem just traps it inside.

Duct Sealing Services in Lake Stevens

Duct Sealing Services in Lake Stevens cover the full range of what your forced-air system needs to move air efficiently and keep your indoor air clean. That includes sealing supply and return ducts, repairing or replacing damaged flex duct, sealing around register boots, and addressing the specific problems that come with shared building systems in apartments and condos.

We were called to a 1990s two-story duplex near the Lake Stevens waterfront where the lower unit’s dryer took two cycles to dry a load. Our tech pulled the shared stack apart and found a bird nest and decades of compacted lint blocking the four-inch run above the second-floor connection. After source removal with agitation tools and a camera inspection, airflow was restored and we sealed the joint with foil tape and mastic to prevent future lint bypass.

That job illustrates why duct sealing in Lake Stevens isn’t the same as duct sealing in a dry climate or a city with only single-family homes. Our marine environment, our housing density, and our mix of building ages create problems that require local knowledge to diagnose and fix properly.

Shared Stack Sealing for Multifamily Buildings

Dense Lake Stevens apartment and condo buildings often share a single dryer exhaust stack, so lint from multiple units accumulates in one vertical run that no single resident can access or maintain. This stack design means a dryer vent fire risk here is a building-wide system issue, not an individual unit problem. We seal these stacks with proper access panels and code-compliant materials so the building can be maintained going forward.

Pressure Testing and Verification

Every sealing job we complete includes before-and-after pressure testing. We measure the leakage in CFM at 25 Pascals, seal the system, then test again. You see the numbers. We don’t guess, and we don’t call it done until the ductwork meets the standard we quoted.

Trusted Brands We Service in Lake Stevens

We carry professional-grade equipment and materials on every truck: Nikro negative-air machines for controlled containment during duct access work, Honeywell and Aprilaire filtration components for systems where we’re sealing around air cleaners, and Abatement Technologies HEPA filtration for jobs in tight Lake Stevens multifamily units where equipment access is limited and we need to run long hose runs without losing suction. We stock foil tape, mastic, and mechanical fasteners sized for everything from four-inch dryer duct to 16-inch commercial trunk line. Most repairs don’t require a parts order, which means we finish the same day we start.

Common Duct Sealing Problems We See in Lake Stevens Homes

• Crushed or disconnected flex duct in newer subdivisions. In the east-side Lake Stevens subdivisions built during the 2000s boom, builder-grade flex duct is often kinked behind drywall or pulled loose at the plenum connection. Homeowners call us thinking their furnace is failing, when it’s actually heated air dumping into the attic.
• Rust and rodent damage in older lakefront homes. The 1960s and 1970s ranchers near downtown and the Lake Stevens shoreline have original galvanized duct that’s corroded from decades of high humidity, plus entry points where squirrels and rats have chewed through from nearby wooded ravines.
• Negative pressure pulling humid air through leaks. Tight construction in newer Lake Stevens townhomes and condos creates negative pressure that sucks damp crawlspace or attic air into duct joints, causing condensation inside the system and mold growth that shows up as a musty smell from the registers.
• Shared dryer stacks clogged with lint from multiple units. Apartment and condo buildings throughout Lake Stevens have vertical dryer exhaust runs that serve four to eight units. No individual resident can clean or seal these, so lint compacts until airflow is blocked and the fire risk becomes serious.

Pricing for Duct Sealing in Lake Stevens, WA

We Also Serve Cities Near Lake Stevens

Our crews work throughout Snohomish County, including Lake Stevens, Marysville, Everett, Granite Falls, and Snohomish. Same standards, same written pricing, same 365-Day Done Right Promise in every city we serve.

FAQs About Duct Sealing in Lake Stevens