Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Fast, Reliable Duct Sealing Across Glendale
Duct sealing in Glendale isn’t a generic job. It’s a repair tailored to homes built between 1920 and 1960, many with original galvanized steel ductwork that has spent decades pulling dust from the Verdugo Mountains and San Gabriel foothills into your living room. When we seal ducts in Glendale, we treat the system as it actually exists here: hillside-home returns buried in crawlspaces, register boots caked with soot, and joints that have been leaking conditioned air into attics since the Eisenhower era. A sealed duct system in Glendale means the air you paid to cool stays in the rooms where your family actually breathes it. If you’re seeing dust settle on furniture within days of cleaning, or certain rooms never reach the temperature on the thermostat, call Hollis Air Duct Pasadena at (626) 469-5477. We’ll inspect, price the work in writing, and seal the system by the book.
Why Hollis Air Duct Pasadena Is Glendale’s Preferred Duct Sealing Company
Glendale homeowners ask a fair question before they let anyone into their home: does this crew know what it’s doing with a 1930s Spanish Colonial, a 1950s ranch, or a 1970s condo? We do. Our technicians have worked in Rossmoyne, Verdugo Woodlands, Adams Hill, and the flatland streets north of Glenoaks, and they know what those homes hold. They know that a 1930s return boot in Rossmoyne will look different from one in a 1980s condo off Brand Boulevard, and they price accordingly before touching a single seam. The crew arrives uniformed and background-checked. The price is written before work starts and does not move at the door. Phones are answered by a live person around the clock. No voicemail loops. No waiting until Monday. That’s how we operate, and it’s written into The Garrison Standard that governs every Hollis job.
Roy Castellanos leads the team with a simple rule: show up inside the appointment window, put the price in writing, do the work by the book, and leave the site cleaner than you found it. That discipline matters in Glendale, where homes sit on slopes and access points are often tight. We schedule and dispatch from our Los Angeles office, with crews serving Glendale directly, so we’re not routing a technician in from another county and asking you to wait. When a Glendale homeowner calls about a return duct that’s been pulling wildfire smoke into the house, the person who answers the phone knows the address is in our service area and can get a crew scheduled.
Styles & brands we work with
Air Duct Sealing in Glendale
Air duct sealing in Glendale closes the gaps, cracks, and loose joints that let conditioned air escape into attics, crawlspaces, and wall cavities before it ever reaches a bedroom or living room. In a Glendale hillside home, that’s not a minor efficiency detail. It’s the difference between a bedroom off the canyon staying at 78 degrees while the thermostat reads 72, and a system that actually delivers the air it’s producing. We use mastic sealant and metallic tape rated for the static pressure of your system. On the older galvanized steel ducts common in Glendale, surface preparation matters more than the product itself. Loose rust and old, brittle tape have to come off before new sealant can bond. Skip that step and the seal fails within a season.
A typical Duct Sealing job in Glendale runs from $350 to $900 for a single system, depending on how much of the ductwork is accessible and how many seams and boots need work. Homes with original galvanized ducts on multiple floors land on the higher end because the prep work takes longer. A 1970s condo with a short flex-duct run in a single closet typically lands on the lower end. The price is written before the work begins, and it covers the full job: prep, mastic, tape, and a post-seal pressure test.
Accessible-Duct Sealing
Some Glendale homeowners only need the accessible portions sealed: the registers, boots, and visible duct runs in the attic or crawlspace. This is common in 1950s ranches where the trunk line is exposed in the attic and only the branch runs disappear into walls. We seal everything we can reach, then run a pressure test to gauge what remains. If the test shows more than minor leakage, we’ll show you the numbers and explain what it would take to reach the rest.
Whole-System Sealing
Whole-system sealing is what Rossmoyne and Verdugo Woodlands homes often require. Original galvanized supply and return ducts from the 1920s through the 1950s develop gaps at nearly every connection point over decades of thermal cycling. Hot days followed by cool canyon nights expand and contract the metal until joints loosen and sealant from previous repairs cracks. Sealing the whole system means working every seam and boot we can reach, not just the easy ones in the attic. It’s slower work, and it’s the only approach that stops the fine gray dust those hillsides push into homes.
Duct Sealing Services in Glendale
Duct sealing services in Glendale are not one-size-fits-all. A 1930s duplex north of the 134 has different ductwork than a 1970s condo on Central Avenue, and sealing each one properly requires knowing what you’re looking at. We handle galvanized steel, aluminum flex, and the transitions between both. In older Glendale homes, it’s common to find newer flex duct spliced onto original galvanized trunk lines, and the splice points are where the leaks are. We seal those transitions with mastic rated to bond to both materials, so the connection doesn’t fail the first time the AC kicks on in July.
A typical duct sealing service in Glendale runs from $350 to $900 for a single system. Homes with asbestos tape on original ducts cost more because we do not disturb that tape. We seal around it, using methods that don’t release fibers into the air stream. Hillside homes with accessible crawlspaces generally cost less than slab-built homes where ducts run through finished ceilings and walls. We’ll give you a written range before scheduling, so you know the worst-case number before the crew arrives.
Register Boot and Plenum Sealing
The register boot is where the duct meets the floor or wall grate. In a 1930s Rossmoyne home, those boots have been pulled, kicked, and shifted for ninety years, and the gaps around them let attic air and dust into the conditioned stream. Sealing the boots means removing each register, cleaning the contact surface, and applying mastic around the full perimeter. It’s a small fix with an outsized effect on dust and room-to-room temperature differences.
Negative-Pressure Testing After Sealing
We don’t hand you a bill and drive away. After sealing, we run a negative-pressure test on the system to confirm the seal actually reduced leakage. In Glendale’s hillside homes, brush-fire soot accumulates fast, and a seam that wasn’t properly tested will reopen under the next Santa Ana event. If the test shows the system still leaking above an acceptable threshold, we keep working. The 365-Day Done Right Promise backs that work in writing for a full year.
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 Glendale
Hollis Air Duct Pasadena works with equipment and materials from Abatement Technologies, Aprilaire, and Rotobrush. These are the same brands commercial remediation crews use, not hardware-store substitutes. For Glendale homeowners, that matters because the older galvanized systems in this city need professional-grade tools to clean and prep properly before sealing. Our Rotobrush rotary brush systems loosen the baked-on dust that clings to 1920s-era duct walls, and our negative-air machines keep that dust from blowing back into your home during the job. Filtration from Aprilaire and Guardsman helps us protect the air inside while we work. We stock the sealants and tapes these systems require, so a Glendale job doesn’t stall waiting for a part to ship from a warehouse.
Common Duct Sealing Problems We See in Glendale Homes
- Santa Ana-driven dust on curing mastic: In hillside homes with open windows, fine dust settles on mastic before it fully cures, which weakens the bond. We time prep and application to minimize exposure, and we seal in sections rather than opening the whole system to the wind.
- Internal corrosion in 1920s-era galvanized ducts: Older galvanized steel corrodes from condensation and age. The corrosion creates a rough surface that sealant can’t bond to, and it flakes off under pressure. Surface prep has to be thorough or the seal fails within a season.
- Brush-fire soot reopening sealed seams: Homes in Verdugo Woodlands and Rossmoyne accumulate soot rapidly during fire season. If a seal wasn’t pressure-tested, that soot finds the weak point and works it open. Proper testing after sealing is not optional on these streets.
- Asbestos tape limiting access: Many original Glendale ducts have asbestos tape at the joints. Disturbing it releases fibers, so we never sand or scrape it. We seal around it using methods that keep it intact and contained, which takes more time but protects the air in your home.
See the difference
Before
After
Before
After
Before
AfterPricing for Duct Sealing in Glendale, CA
A typical whole-system duct sealing job in Glendale runs from $350 to $900. Where your home lands depends on three things: how much of the ductwork we can reach, how many seams and boots need work, and whether asbestos tape is present. A 1950s ranch with exposed attic ducting and no asbestos usually lands near $450 to $650. A 1930s Spanish Colonial in Rossmoyne with asbestos tape, multiple floors, and tight crawlspace access can run $750 to $900. That price is written before work starts and does not change at the door. No per-vent pricing. No bait-and-switch coupon. Call (626) 469-5477 for a free estimate, and we’ll give you a firm written range based on your specific system.
We Also Serve Cities Near Glendale
Our crews work throughout the San Gabriel Valley and the foothill communities around Glendale. If you’re in Burbank, Altadena, Pasadena, or Alhambra and dealing with leaky ducts or dust that won’t settle, the same written pricing and 365-Day Done Right Promise apply. Call (626) 469-5477 and we’ll let you know when a crew can reach your neighborhood.
Serving Glendale, CA - Our Local Coverage Area
We’re based in the Glendale 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 Glendale
Mastic sealant applied around the outside of the joint works best for Glendale’s older galvanized ducts, because it bonds without requiring you to scrape or sand the asbestos tape. We never disturb that tape. The mastic is rated for high static pressure, which matters on hillside systems with long duct runs and sharp bends. If the tape is intact, it stays intact. We seal the seams and boots around it, then test the system to confirm the leak rate dropped.
Most hillside homes in Glendale should have their duct seals inspected every three to five years. Homes that have been through multiple brush-fire seasons or that sit directly below canyon slopes may need attention sooner. Soot and fine dust work their way into any small gap, and the thermal cycling of hot days and cool nights causes mastic to crack over time. If you see gray dust on furniture within days of cleaning, or smell smoke when the AC runs, call us and we’ll check the system.
Yes, sealing ducts prevents smoke and soot from entering the ductwork through leaks in attics and crawlspaces. What you’re smelling is not always smoke inside the house, it’s smoke-laden air from outside being pulled into leaky return ducts and blown through the home. Sealing those gaps stops that pull. For a lingering smell already embedded in the ducts themselves, a deep cleaning with our Rotobrush or negative-air equipment, combined with filtration, may be needed. We can assess both when we inspect.
Sealing accessible ducts near the registers will help, but it is rarely enough in a 1950s Glendale ranch with original galvanized ductwork. The largest leaks are usually in the trunk lines in the attic and the transition points where different materials meet. If you seal only the boots, you’ll reduce some dust, but the system will still lose conditioned air through the larger gaps you can’t see. We recommend sealing everything we can reach and testing the system afterward. The test numbers will show you exactly how much improvement you’re getting for the money.
Cleaning removes what’s already inside the ducts. Sealing stops new dust, smoke, and unconditioned air from getting in. If rooms are unevenly heated or cooled, your energy bills climb in summer, and dust reappears days after cleaning, you likely need sealing. If the system is simply dirty after a remodel or decades of use, cleaning may be enough. Our inspection covers both questions, and we’ll tell you which one is the actual problem. Call (626) 469-5477 for a free estimate.
Call Hollis Air Duct Pasadena for Duct Sealing in Glendale
If your Glendale home has original ducts, hillside dust, or rooms that never reach the right temperature, we’ll inspect the system and tell you honestly what it needs. The price is written before the work starts. The guarantee is written for a full year. Call (626) 469-5477 today and speak to a live person, not a voicemail tree. Roy and the crew know Glendale’s houses and they know what it takes to make the air move the way it should.
Written by Roy Castellanos, Owner at Hollis Air Duct Pasadena, serving Glendale and the surrounding communities.