Duct Sealing in Kenmore - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Kenmore

Duct sealing in Kenmore typically runs $450 – $1,200 for a whole-home system and is scheduled within a few business days, not weeks. We’re familiar with the specific failure patterns in Kenmore’s mid-century housing stock, and our crews serve the city from our Seattle office with dispatch windows we actually hit.

Call (361) 326-5060

Kenmore sits between Lake Washington and the Sammamish River, and that geography shapes what goes wrong inside its ducts. The 1950s-70s ranches and split-levels that dominate neighborhoods like Arrowhead and Inglewood-Finn Hill still run original unlined galvanized steel duct trunks. After 50-70 years of service, those steel runs corrode from the inside, flake zinc coating into the airstream, and develop disconnected joints where crawlspace air gets pulled straight into the living space. Our Duct Sealing team treats this as a mechanical repair job, not a spray-and-pray coating. We source-remove the corrosion, band the seams, and seal only after the substrate is sound. Call (361) 326-5060 to book a free estimate with camera inspection.

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

We’ve worked on enough Kenmore homes to know the difference between a 1962 ranch off Juanita Drive and a 1978 split-level near Bastyr University. That local knowledge matters because the duct routing, crawlspace conditions, and corrosion severity change block by block. Our technicians arrive uniformed, background-checked, and equipped with written pricing before any work starts.

Hollis has been part of the Garrison Partners family since 2004. The Garrison Standard requires showing up inside the quoted window, pricing in writing, completing the job by the book, and leaving the site clean. Every repair we perform in Kenmore carries the 365-Day Done Right Promise: if the work fails within a year, we return 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. You’ll talk to someone who can actually schedule your job, not a callback queue that dumps you into voicemail.

Duct Sealing Services in Kenmore

Duct Sealing Services in Kenmore address a problem most homeowners don’t notice until their energy bills spike or their registers start puffing fine grey dust. The process involves finding every leak in your supply and return ductwork, mechanically repairing disconnected joints, coating corroded sections with mastic, and applying sealant only to sound substrate. For Kenmore’s original galvanized steel systems, this is essential: aerosol sealants sprayed over flaking rust will skin over, then fail within a season when the scale underneath lets go.

A typical whole-home duct sealing in Kenmore runs $450 – $1,200 depending on system size, crawlspace accessibility, and how much corrosion remediation is needed. We price by the system, not by the vent, and we write the number down before any work starts.

Mechanical Joint Repair and Banding

Disconnected joints are the most common leak point in Kenmore’s older steel systems, especially in crawlspaces along the Sammamish River corridor where seasonal moisture and rodent activity accelerate deterioration. We mechanically band every separated seam before any sealant touches the surface. This is labor-intensive, but it’s the only way to achieve a permanent seal on 60-year-old metal.

Corrosion Source-Removal and Coating

Flaking galvanized coating cannot be sealed over. We agitate and extract loose rust scale using Rotobrush rotary tools paired with Nikro negative-air HEPA collection, then coat sound metal with duct mastic. Only then do we apply final sealant. This sequence is what separates a repair that lasts from a repair that looks good for a month.

Duct Insulation in Kenmore

Duct Insulation in Kenmore serves a specific purpose: keeping conditioned air at temperature as it moves through unconditioned crawlspaces, attics, and garage chases. In Kenmore’s climate, where outdoor humidity stays elevated from October through April and crawlspaces along the river corridor hold standing moisture, uninsulated ducts sweat, grow mold, and lose efficiency fast. Proper insulation also prevents the thermal losses that force your furnace or heat pump to run longer cycles.

Whole-home Duct Insulation in Kenmore typically costs $600 – $1,800 depending on linear feet of duct, R-value selected, and whether we’re working in a tight crawlspace or open attic. We always check your air handler’s blower motor curve and current static pressure before adding insulation, because a tighter, better-insulated duct system changes the resistance the blower sees. Ignore that step and the motor runs hotter than spec.

Vapor-Barrier Installation for Crawlspace Runs

Kenmore’s wet climate demands insulation with intact vapor barriers on the warm side. We see too many jobs where standard wrap was installed without sealing the barrier seams, trapping moisture against the duct metal. Our crews use products rated for Pacific Northwest humidity and seal every seam with appropriate tape.

Static Pressure Verification After Insulation

Adding insulation changes duct dimensions and airflow characteristics. We measure static pressure at the air handler before and after the job to confirm your system is still operating within manufacturer specifications. This step protects your blower motor and keeps your warranty intact.

Trusted Brands We Service in Kenmore

Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation, Nikro negative-air machines for contained debris extraction, and filtration and insulation products from Aprilaire, Abatement Technologies, and Guardsman. These are the same tools commercial crews use, not hardware-store rentals. For Kenmore homeowners, this means we stock parts and materials locally and can complete most jobs without waiting on special orders. If your system uses Honeywell or Aprilaire filtration components, we carry those too. Fast turnaround matters when you’re running a furnace through a damp Pacific Northwest winter with compromised ducts.

Common Duct Sealing Problems We See in Kenmore Homes

• Aerosol-only sealing over flaking galvanized steel. Some contractors spray sealant directly onto corroded 1960s ductwork. The sealant skins over rust scale that looks bonded but isn’t. Six months later, the scale lets go and your “sealed” ducts leak worse than before. We remove the corrosion first.
• Sealing trunks without repairing disconnected crawlspace joints. The supply and return trunks get sealed while joints in the Sammamish River corridor crawlspace runs stay open. Your blower still pulls damp, rodent-affected crawl air into the system. We inspect and band every accessible joint.
• Ignoring static pressure after adding insulation and sealant. A tighter duct system raises resistance. The blower motor works harder, runs hotter, and fails prematurely. We measure and verify before we leave.
• Rodent-damaged flex connectors in river-corridor crawlspaces. The 1960s-70s homes near the Sammamish River often have flex duct connectors chewed by rodents. These get missed in a trunk-only sealing job. Our camera inspection catches them.

Pricing for Duct Sealing in Kenmore, WA

We Also Serve Cities Near Kenmore

Our crews regularly work in Kenmore and the surrounding communities: Bothell to the east, Mountlake Terrace to the west, Lynnwood to the north, and Woodinville to the northeast. Each area has distinct housing stock and duct configurations, and we adjust our approach accordingly. Scheduling is coordinated from our Seattle office with local dispatch to your area.

FAQs About Duct Sealing in Kenmore