Duct Sealing in Lynnwood - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Lynnwood

Duct sealing in Lynnwood typically runs $450 – $950 for a whole-home system, and we always put the price in writing before any work starts. If you’re moving into a new townhome off 196th Street SW or settling into a rambler near Alderwood Manor, sealed ducts are what keep heated and cooled air inside your living space instead of bleeding into the attic or crawlspace. Our crews dispatch from the Seattle office and carry mastic, foil tape, and aerosol sealant rated for the damp marine conditions that define western Snohomish County. Call (361) 326-5060 and we’ll schedule a free inspection, show you what the camera sees, and give you a flat price that does not move.

Call (361) 326-5060

Why Hollis Air Duct Cleaning Is Lynnwood’s Preferred Duct Sealing Company

We’ve been sealing and cleaning ducts in the Garrison Partners family since 2004, and our Lynnwood customers know the difference between a crew that prices by the vent and one that prices by the system. Roy Castellanos runs this operation under The Garrison Standard: written prices, written guarantees, and technicians who arrive uniformed, background-checked, and inside the quoted window.

Our 365-Day Done Right Promise covers every duct sealing job in writing. If a seal fails or a joint opens within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.

Phones are answered by a live person 24 hours a day, 7 days a week. That matters in Lynnwood, where many of our calls come from homeowners who have already been ghosted by another outfit or watched a quote balloon once the van pulled into the driveway.

We know the local housing stock. From the postwar ramblers near Martha Lake to the newer townhome clusters along 196th Street, we understand which systems have original galvanized steel, which have flex duct chewed by crawlspace rodents, and which new builds still carry construction dust the builder never touched.

Duct Sealing Services in Lynnwood

Duct Sealing Services in Lynnwood address the leaks, gaps, and failed joints that let conditioned air escape before it reaches your rooms. In this market, we see two distinct problems: aging metal ducts in 1960s ramblers that have corroded at the seams after decades of wet marine air, and newer flex-duct systems in townhomes where the original installer left gaps at the plenum or used tape that has already dried and peeled. A typical whole-home duct sealing in Lynnwood runs $450 – $950 depending on system size, accessibility, and whether we need to replace damaged flex runs. We always inspect with a camera first, price in writing, and seal with mastic or aerosol methods appropriate to the duct material.

Leak Detection and Sealing

We pressurize the system and use smoke pencils or thermal imaging to find the exact points where air is escaping. In Lynnwood’s older homes near Alderwood Manor, the leaks are often at rusted sheet-metal seams; in newer construction, they’re typically at poorly sealed plenum connections or crushed flex duct in tight attic spaces.

Aerosol Duct Sealing

For systems with many small leaks distributed throughout hard-to-reach runs, we offer aerosol sealing that fills gaps from the inside. This method works well in Lynnwood’s split-levels and ramblers where crawling every joist bay with a brush and mastic would take days and disturb insulation that is already saturated from our wet climate.

Duct Insulation in Lynnwood

Duct Insulation in Lynnwood is not an afterthought in this climate, it is essential. When your ducts run through an unconditioned attic or vented crawlspace in a city where outdoor humidity stays high eight months of the year, uninsulated metal becomes a condensation magnet. That moisture drips onto ceiling drywall, breeds mold in crawlspaces, and destroys the very seals you just paid to install. A typical duct insulation job in Lynnwood runs $600 – $1,400 for wrapping or replacing existing insulation on a whole-home system, with price depending on linear footage, R-value needed, and whether the old insulation is water-damaged and must be removed first. We use materials rated for marine climates and vapor-barrier assemblies that actually work in Snohomish County conditions.

Vapor Barrier Installation

Lynnwood’s cool, wet marine air keeps outdoor humidity high for much of the year, which accelerates corrosion inside metal ducts and encourages mold growth in systems that lack proper vapor barriers. We install sealed vapor-barrier wraps with taped seams, not the loose fiberglass sleeves that sag and hold moisture against the duct surface.

Condensation Control

In crawlspaces throughout Martha Lake and the older neighborhoods off 44th Avenue West, we regularly find supply ducts dripping onto the vapor barrier below. Proper insulation with a sealed exterior jacket stops this cold-surface condensation and protects the structural integrity of both your ducts and your floor framing.

Trusted Brands We Service in Lynnwood

Our trucks carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, plus filtration and sealing products from Honeywell, Aprilaire, and Guardsman. For Lynnwood homeowners, this means we stock the mastic, foil tape, and insulation wraps that match your existing system rather than ordering parts and making you wait. Our rotary brush systems and negative-air machines are the same tools commercial crews use on hospitals and schools, and our technicians can explain what each piece does while they work. If your new townhome needs sealing after the builder’s crew walked away, we have the HEPA-filtered containment and agitation tools to clean the runs first, then seal them right.

Common Duct Sealing Problems We See in Lynnwood Homes

• Builder handover dust in new townhomes: New Lynnwood townhomes in the 196th Street corridor often get a final clean of walls and floors but the ducts are never touched, so drywall dust and construction debris stay in the supply and return runs. We were called to a new-build townhome off 196th Street SW where the owners had been in the house six months and were still wiping drywall dust off every surface, even with the air handler running and a fresh filter in place. Our tech pulled the registers in two upstairs bedrooms, ran a camera inspection down the supply and return ducts, and found a heavy settled layer of drywall dust and construction debris from the build – material the builder’s final clean never touched because the HVAC system was still covered and no NADCA standards clean was ever done. We set up negative pressure with HEPA filtration, worked the runs with agitation tools, and the surface-dust complaint stopped.
• Sealing over a dirty system: Sealing a new build’s ductwork before debris is removed just locks construction dust and drywall dust inside the runs, and the seams you seal do nothing for the dust still circulating. We inspect with a camera before we seal, every time, because sealing first and cleaning later is doing the job backward.
• Skipped camera inspections: Crews who skip a camera inspection on these newer tight systems miss debris that settled in the plenum or a flex run, so the seal looks fine and the air still smells like a construction site. Our written process requires camera documentation before and after so you see what was in there.
• Corroded original metal in mid-century ramblers: Lynnwood’s postwar housing boom left thousands of 1950s – 70s ramblers and split-levels with original sheet-metal ducts that now heave with rust and debris from decades of damp marine air. Because so much of the city’s housing is older and tightly packed along I-5, duct sealing here is less about new construction dust and more about rescuing corroded, rodent-visited systems that have never been touched.

Pricing for Duct Sealing in Lynnwood, WA

We Also Serve Cities Near Lynnwood

Our crews work throughout Snohomish and northern King counties, including Lynnwood and the surrounding communities of Mountlake Terrace, Kenmore, Edmonds, and Bothell. Dispatch and scheduling are coordinated from our Seattle office, with local crews serving each area. Whether you need Duct Sealing in a mid-century rambler or a new townhome, the same written pricing and 365-Day Done Right Promise applies.

FAQs About Duct Sealing in Lynnwood