Duct Sealing in San Jose - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across San Jose

Duct sealing in San Jose typically runs $800 – $2,400 for a whole-house system, with most single-family jobs falling between $1,200 and $1,800 depending on access and the extent of leakage. We seal ducts in San Jose homes, condos, and apartment buildings from Willow Glen to Alum Rock, and our crews are familiar with the tight chase walls and shared risers that define much of the city’s newer housing stock. If you’re seeing uneven temperatures, dust streaks near registers, or energy bills that climb without explanation, call (361) 326-5060. We’ll give you a written price before any work starts.

Call (361) 326-5060

Our San Francisco Bay Area office coordinates dispatch and scheduling for San Jose, which means we’re routing crews with local knowledge, not sending someone up from Fresno who has never worked a downtown high-rise chase. San Jose’s housing spans seven decades of construction methods, from post-war Eichler tracts to North San Jose towers, and each type carries its own duct failure pattern. We price by the system, not by the vent, and we don’t move the number once we’re inside.

Why Hollis Air Duct Cleaning Is San Jose’s Preferred Duct Sealing Company

We’ve been part of the Garrison Partners family since 2004, and our Duct Sealing in San Jose crews operate under The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. San Jose homeowners know the difference between a crew that shows up uniformed and accounted-for and one that sends a subcontractor in an unmarked van. Our technicians are background-checked and wear Hollis uniforms. You know who’s walking into your home before they arrive.

Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday for a scheduling question. Our 365-Day Done Right Promise covers every duct sealing job in writing: if the work fails within a year, we return and make it right at no charge, including a free second visit. That’s not a satisfaction guarantee; that’s a specific obligation with a date attached.

We serve neighborhoods across San Jose, from the eastern foothills of Evergreen and Alum Rock to the downtown condos and the Eichler tracts of West San Jose. Each area presents different duct conditions, and our crews carry the equipment to match: Rotobrush rotary brush systems for mechanical agitation, Nikro negative-air machines for containment, and Guardsman mastic for sealing joints that need to hold under pressure.

HVAC Duct Sealing in San Jose

HVAC Duct Sealing in San Jose means closing the gaps, cracks, and disconnected joints in your forced-air system so the air you’ve paid to heat or cool actually reaches the rooms it’s supposed to serve. In a typical San Jose home, 20 – 30% of conditioned air leaks into the attic, crawlspace, or wall cavities before it ever hits a register. We locate those leaks with camera inspection and pressure testing, then seal them with mastic or metal-backed tape rated for duct applications, not the hardware-store stuff that peels off in a hot attic.

San Jose’s Mediterranean climate, dry summers and wet winters, keeps HVAC systems running year-round. That constant cycling expands and contracts duct joints, especially in older galvanized systems. After wildfire seasons like the SCU Lightning Complex, we’ve found that smoke particles and resinous ash work into existing gaps, then get distributed through the house every time the blower kicks on. Sealing stops that migration at the source.

When Sealing Becomes Necessary

You’ll know it’s time when rooms stay stubbornly hot or cold despite the thermostat setting, when dust streaks appear on ceiling or wall registers, or when your PG&E bill climbs without a rate change. In San Jose’s Eichler-style homes, with their original galvanized duct systems, we often find joints that have worked completely loose after sixty years of thermal cycling.

What the Process Looks Like

We start with a visual and camera inspection of accessible ductwork, then pressurize the system to measure total leakage against the conditioned floor area. After that, we seal what’s accessible, replace damaged sections, and retest to confirm the drop. You get before-and-after photos of your own ducts, not stock images, and a written report with the pressure-test numbers.

Duct Repair in San Jose

Duct Repair in San Jose addresses the physical damage that sealing alone won’t fix: crushed flex runs, corroded galvanized sections, pest intrusion holes, and joints that have separated completely. We see a lot of this in the post-WWII housing stock, especially in neighborhoods like Alum Rock and parts of Willow Glen where original ductwork has spent decades in crawlspaces with seasonal moisture and rodent activity. Repair means cutting out the damaged section and splicing in new material, then sealing the connections properly.

In San Jose’s downtown and North San Jose high-rises, duct repair often means sealing vertical supply and return risers and shared exhaust stacks inside chase walls, work that cannot be scoped or sealed the same way as a single-family attic duct run in Willow Glen. These shared systems require coordination with building management, scheduled access to multiple units, and containment procedures that protect neighbors from dust and debris. Our crews have done this work in San Jose buildings enough to know the permitting and notification requirements that keep the job moving.

Common Repair Scenarios

Crushed flex duct from a contractor crawling over it in the attic. Corroded galvanized trunk lines with pinhole leaks that spray conditioned air into the insulation. Disconnected collars where the duct has pulled away from the boot, dumping air into the wall cavity. Each gets a specific fix, not a blanket approach.

After Wildfire Damage

Following major wildfires, many San Jose homeowners in the eastern foothills find their ducts coated with a sticky, resinous ash that standard vacuuming won’t remove. We manually brush and chemically treat these surfaces before sealing, because mastic won’t bond to ash residue. Skip this step and the sealant fails within months.

Trusted Brands We Service in San Jose

Our San Jose crews carry professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies, and we stock sealing and filtration products from Honeywell, Aprilaire, and Guardsman. That matters for turnaround: when we find a failed component during a sealing job, we don’t need to order parts and reschedule. We seal with Guardsman mastic rated for the temperature swings of an attic or chase wall, not general-purpose caulk that hardens and cracks. For filtration upgrades tied to sealing work, we install Aprilaire media cabinets and Honeywell electronic air cleaners where the duct geometry allows. San Jose customers get the same tools commercial crews use, explained in plain terms on every job.

Common Duct Sealing Problems We See in San Jose Homes

• Shared riser leaks in downtown and North San Jose high-rises. Sealing attic or crawlspace duct joints without first locating leaks via camera inspection means shared riser leaks in downtown and North San Jose high-rises keep pulling smoky air from the chase. We inspect the full pathway, not just the accessible registers.
• Lint-packed dryer vent stacks in condo buildings. Treating the dryer vent as a single-unit problem when the lint pathway is a shared stack serving multiple condos lets lint reaccumulate below the unit and increases dryer fire risk. We scope the full vertical run and seal accessible joints with Guardsman mastic after clearing the blockage.
• Failed sealant on wildfire-ash residue. Using standard tape or mastic on resinous ash residue after a wildfire without manual brushing and chemical treatment means the sealant fails to bond and the supply and return ducts continue feeding smoke odor. We clean before we seal, every time.
• Eichler-era galvanized systems with thermal fatigue. Much of San Jose’s housing stock dates from the post-WWII boom of the 1950s-60s, especially the Eichler-style tract homes in West San Jose, with original galvanized or early flex duct systems prone to leaks, dust buildup, and pest intrusion. These systems need repair before sealing can be effective.

Pricing for Duct Sealing in San Jose, CA

We Also Serve Cities Near San Jose

Our Duct Sealing crews work throughout the South Bay, including Milpitas, Santa Clara, Sunnyvale, and Campbell. Each city has its own housing stock and duct conditions, and we adjust our approach accordingly. Whether you’re in a Campbell ranch or a Sunnyvale townhouse, the same standards apply: written price, written guarantee, background-checked uniformed technicians.

FAQs About Duct Sealing in San Jose