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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across Santa Clara
We serve Santa Clara homeowners from our San Francisco Bay Area dispatch office, with crews that know the difference between an Eichler original duct run and a modern flex system. We also offer our Dryer Vent Cleaning in Santa Clara for comprehensive home ventilation care. If your registers blow dust even after cleaning, or your back bedrooms never reach temperature, the problem is usually leaks, not dirt. Call (361) 326-5060 for a free estimate. We arrive inside the quoted window, price the work in writing before we touch anything, and leave the site clean.
Why Hollis Air Duct Cleaning Is Santa Clara’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing in Santa Clara work follows The Garrison Standard: written prices, written guarantees, and technicians who show up uniformed and background-checked. Santa Clara homeowners tell us the 365-Day Done Right Promise matters because too many crews in this market price low, seal fast, and disappear when the dust returns.
Our phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues. When you schedule duct sealing in Santa Clara, you get a written price before work starts and a 365-Day Done Right Promise in writing. If the seal fails within a year, we return and make it right at no charge, including a free second visit.
We know Santa Clara’s neighborhoods. Our crews work regularly in the Old Quad near Santa Clara University, the Eichler tracts along Monroe Street, and the ranch-style homes around Buchser Middle School. That local knowledge means we recognize the failure patterns: crushed rigid metal runs, disconnected boots, and flex duct that was never properly sealed at the air handler.
Air Duct Sealing in Santa Clara
Air Duct Sealing in Santa Clara addresses the leaks and disconnections that let conditioned air escape into attics, crawl spaces, and wall cavities. In this market, we typically see two scenarios: original 1960s rigid metal ductwork in Eichler and ranch homes where mastic has dried and cracked at every joint, or newer flex duct in high-density developments where the collar connections were never sealed with proper tape and mastic. A typical whole-system sealing job in Santa Clara runs $850 – $1,800 depending on accessibility, duct material, and whether we need to replace crushed or disconnected runs.
Camera Inspection Before Sealing
We run a camera through every trunk line before we seal. In Santa Clara’s older homes, this step finds the real problems: disconnected boots buried in insulation, crushed supply runs that negative pressure has collapsed over decades, and gaps at the plenum that no amount of register sealing will fix. Without this inspection, you’re paying to seal leaks that don’t exist while the actual leaks keep bleeding air.
Source Removal and HEPA Filtration
Santa Clara’s position in Silicon Valley’s tech corridor means duct debris here can carry fine silica dust and metal oxides from nearby semiconductor manufacturing and data-center construction. Before we seal, we remove the source contamination and filter the airstream with HEPA-rated equipment. This isn’t optional in Santa Clara. The Bay Area Air Quality Management District and Santa Clara County hazardous-materials guidelines require proper handling, and sealing over contaminated ducts traps that debris inside your system.
Duct Sealing Services in Santa Clara
Duct Sealing Services in Santa Clara cover the full range of leak repair, from spot-sealing accessible joints with mastic and reinforced tape to replacing entire crushed or disconnected runs. Our Duct Sealing team works with both rigid metal and flex duct systems common across Santa Clara’s housing stock. Most homeowners call us after noticing uneven heating, rising energy bills, or dust that returns within weeks of cleaning. A typical partial sealing job for 2 – 3 problem runs runs $400 – $700; whole-system sealing with replacement of damaged sections ranges $1,200 – $2,400 in this market.
Mastic Application for Rigid Metal Systems
Original rigid metal ductwork in Santa Clara’s Eichler and ranch homes needs water-based duct mastic brushed thick at every joint, boot, and trunk takeoff. We don’t use duct tape alone, it dries and fails. The mastic we apply is rated for the temperature cycling these attics see, and we reinforce it at stress points with fiberglass mesh.
Flex Duct Collar and Plenum Sealing
Newer Santa Clara construction often uses flex duct that was sealed at the register box but left loose at the air handler collar and blower motor plenum. We pull and reseat every connection, seal with proper metal-reinforced tape, and apply mastic at the plenum. The blower motor creates the highest pressure point in the system; if it’s leaking, you’re conditioning your attic, not your bedrooms.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Santa Clara
We stock parts and filtration products from Aprilaire, Abatement Technologies, and Guardsman for Santa Clara jobs, with same-day availability on most sealing supplies and HEPA filters. Our equipment roster includes Rotobrush rotary brush systems for pre-sealing source removal and Nikro negative-air machines for controlled debris extraction. When we seal a Santa Clara system, we’re not waiting on parts. That means we finish in one visit, test the seal with a pressure pan, and show you the before-and-after photos of your own ducts.
Common Duct Sealing Problems We See in Santa Clara Homes
- Original rigid metal joints leaking at every boot and trunk takeoff. In Santa Clara’s 1960s Eichler and ranch homes, decades of thermal cycling have cracked the original mastic. We find these leaks with camera inspection, not guesswork, because brushing new mastic over the old without finding the real gaps wastes your money.
- Flex duct sealed at the register, leaking at the air handler. Newer high-density construction around Santa Clara often has flex runs that look fine at the vent but pull loose at the blower motor plenum. The homeowner feels weak airflow in back rooms; the real leak is at the source.
- Winter moisture entering poorly sealed returns, promoting mold. Santa Clara’s wet winters drive moisture into return ducts through attic leaks. Sealing without addressing this moisture traps it inside. We inspect for water staining and recommend return sealing with vapor-barrier considerations.
- Fine silica dust from tech-corridor construction handled as ordinary debris. Our crews bag and dispose of Santa Clara duct debris per County hazardous-materials guidelines, using HEPA filtration during the sealing prep. This step protects our technicians and your indoor air.
Pricing for Duct Sealing in Santa Clara, CA
In Santa Clara, duct sealing costs depend on what we find when we inspect. Spot-sealing 2 – 3 accessible leaks with mastic and tape typically runs $350 – $650. Whole-system sealing for an average 1,500-square-foot home with mixed rigid and flex duct runs $850 – $1,800. If we need to replace crushed or disconnected sections, add $200 – $500 per run depending on length and attic access.
Factors that push Santa Clara jobs toward the higher end: original Eichler rigid metal with multiple disconnected boots, attics with blown-in insulation that must be moved and replaced, and systems requiring HEPA source removal before sealing due to silica dust contamination. We give you one flat price per system, agreed in writing before work starts. No per-vent pricing, no add-ons at the door. Call (361) 326-5060 for an exact quote, estimates are free.
We Also Serve Cities Near Santa Clara
Our crews work throughout the South Bay, including Santa Clara and neighboring Sunnyvale, San Jose, Campbell, and Cupertino. The same Garrison Standard applies: written price, written guarantee, background-checked uniformed technicians, and a 365-Day Done Right Promise on every job.
Serving Santa Clara, CA - Our Local Coverage Area
We’re based in the Santa Clara 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 Santa Clara
Many Santa Clara homes, especially the Eichler and ranch stock built in the 1960s and 70s, have original duct systems that were never properly sealed at installation. Decades of thermal cycling have opened gaps at joints and boots. Cleaning removes debris from inside the ducts but does nothing to stop conditioned air from leaking out or attic air from leaking in. Sealing fixes the envelope. Call (361) 326-5060 and we’ll camera-inspect to show you where your leaks are.
Santa Clara’s proximity to semiconductor manufacturing facilities and ongoing data-center construction introduces fine silica dust and metal oxides into residential duct systems at levels we don’t see in nearby agricultural or purely residential communities. This debris must be handled under Santa Clara County hazardous-materials guidelines, not ordinary disposal. We use HEPA filtration during source removal and bag debris accordingly before sealing. Call (361) 326-5060 for an estimate that includes proper handling.
Sealing alone won’t reconnect a duct. Our crew was in the mid-century Eichler tracts of the Old Quad near Santa Clara University doing a camera inspection and found a crushed, disconnected run in the original rigid metal supply duct feeding the back bedrooms. Negative pressure pulled a steady stream of fine gray powder we had to bag per the County’s hazardous-materials guidelines, and after source removal and HEPA filtration we sealed the trunk and ran new insulated flex to restore balanced supply and return airflow. The homeowner noticed the dust film on the registers stopped returning within days. Call (361) 326-5060 and we’ll inspect to determine whether you need sealing, replacement, or both.
Yes. Santa Clara’s Mediterranean climate brings mild, wet winters that drive moisture into poorly sealed return ducts through attic vents and gaps. Sealing a moist duct system traps that water inside, creating conditions for mold growth. We inspect for water staining and active moisture before sealing, and we address the water entry point as part of the job. Call (361) 326-5060 for a free inspection that includes moisture assessment.
We power down the system, seal the blower motor collar and plenum connections with metal-reinforced tape and mastic, then pressure-test before restart. The blower motor creates the highest static pressure in your duct system; leaks here waste more conditioned air than any register gap. Our technicians are trained on The Garrison Code for HVAC electrical safety, and we verify proper operation before we leave. Call (361) 326-5060 to schedule.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Santa Clara since 2004.