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 Duarte
Duct sealing in Duarte homes typically runs $450 to $1,200 depending on how much of your system needs work, and most jobs are completed in a single day. If you live in a 1950s-70s ranch house near Royal Oaks Drive or a newer foothill subdivision off Huntington Drive, you already know Duarte’s dust problem better than most. Duarte sits at the base of the San Gabriel Mountains where Santa Ana winds push fine ash and grit into homes, especially through leaky ductwork. Our crews serve Duarte daily for Hollis Air Duct Pasadena, and we answer the phone at (626) 469-5477 when you call.
Why Hollis Air Duct Pasadena Is Duarte’s Preferred Duct Sealing Company
Duarte homeowners call us because we write the price down before we touch anything. That’s the Garrison Standard: a number on paper, a 365-Day Done Right Promise on every job, and technicians who show up in uniform, background-checked, and on time. No bait pricing at the door. No surprise line items after the work starts.
We’ve worked in Duarte long enough to know the difference between a house near the 210 Freeway and one up toward Royal Oaks. Freeway-corridor homes pull traffic particulates into leaky return ducts. Foothill homes get Santa Ana ash coating the blower motor until the system overheats on long service drives. Our crews know both patterns because we have sealed ductwork in both parts of town. Roy Castellanos runs our Duarte-facing crew, and he treats every ranch home’s original sheet metal like it was his own system.
Our Duct Sealing team carries Rotobrush inspection cameras, Nikro negative-air machines, and mastic sealants from commercial suppliers. That equipment matters on Duarte jobs. You cannot see a disconnected return plenum under a 1960s crawlspace without a camera, and you cannot hold a continuous seal without negative-pressure verification.
Styles & brands we work with
Air Duct Sealing in Duarte
Air Duct Sealing in Duarte means restoring a continuous, airtight path from your furnace or air handler to every register, using duct mastic and foil tape rated for sheet metal. Duarte’s housing stock makes this job different from most of LA County. Thousands of ranch homes built between the 1950s and 1970s still run original sheet metal ductwork. Those ducts were installed with basic slip joints and tape that dries out within two Duarte summers. Once the tape cracks and the seams open, dust, ash, and crawlspace air move into your living space instead of through the filter.
What Duarte Ranch Homes Need Most
A sealed return plenum is the highest-value repair we make in older Duarte homes. Builders in the 1960s often left return cavities open to the crawlspace, which pulls unfiltered air into the system every time the blower runs. Sealing that plenum and the register boots stops dust from entering the system in the first place.
When Sealing Isn’t a One-Time Fix
Duarte’s semi-arid climate dries mastic and degrades tape faster than coastal air does. The fine particles that blow off the San Gabriel Mountains work into any small gap and widen it over time. We tell Duarte homeowners with original ranch ductwork to plan for sealing as a recurring maintenance item, not a one-and-done repair.
Duct Sealing Services in Duarte
Duct Sealing Services in Duarte cover the full range of what an older home needs: camera inspection of supply and return runs, mastic sealing at every accessible seam and boot, foil tape reinforcement on sheet metal, and negative-pressure verification to confirm the seal holds before we clean up. A typical Duarte ranch home needs sealing at the air handler, the return plenum, and between six to ten register boots.
Supply and Return Ductwork
Supply ducts carry heated or cooled air to your rooms. Return ducts pull air back to the blower. Both leak in Duarte homes. We follow the trade’s standard sequence: inspect first with a camera, seal what is accessible, note what is not, and give you a written report of what we did and what we saw.
Sealing Before or After Cleaning
The right order in Duarte is clean first, then seal. Sealing captures whatever is already inside the ducts. If you seal a dirty system, you lock in that dust and the next cleaning becomes harder. Our team runs the Duarte jobs with Nikro negative-air cleaning before mastic touches any seam.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Duarte
We service all major duct systems in Duarte and keep mastic, foil tape, and replacement boots matched to what your home already has. The equipment we run on your job includes Rotobrush rotary brush systems for cleaning and Nikro negative-air machines for filtration and verification. For homeowners adding whole-home filtration after sealing, we install Honeywell and Aprilaire media filters, which fit most Duarte ranch and foothill systems without modification. Stocking parts locally means we’re not making a second trip across the county when your job needs a specific boot size or filter frame. One trip, one price, one clean site.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Duarte Homes
- Open return plenums under freeway-corridor homes. Ranch homes near the 210 were built with return cavities open to the crawlspace. That pulls unfiltered traffic particulates and crawl dust straight past the filter. Sealing the plenum is the fix, and we see it on nearly every 1950s-70s Duarte home we inspect.
- Santa Ana ash loading on blower motors. Foothill properties around Rancho Duarte and Royal Oaks get ash and fine mountain dust blown through leaky ducts during wind events. The blower motor runs hot, and ash builds up fast. A continuous seal keeps that debris outside the system where it belongs.
- Dried foam tape on original sheet metal seams. The tape Duarte builders used in the 1960s was never meant to last 50 years. Two hot summers crack it. Once it splits, every seam becomes an open pathway for fine dust. We remove the old tape and replace it with mastic and foil rated for the temperature swings Duarte sees.
- Disconnected sections near the air handler. Our crew sealed a ranch home on Royal Oaks Drive where the original 1960s sheet metal supply and return ducts had gaps at every register boot. We ran a camera inspection, found disconnected sections near the air handler, then used duct mastic and foil tape to restore a continuous negative-pressure seal. Dust from the adjacent unpaved shoulder and oak duff stopped showing up on the blower motor within days.
Pricing for Duct Sealing in Duarte, CA
We Also Serve Cities Near Duarte
The same crews that handle Duarte also cover Monrovia, Arcadia, Temple City, and El Monte. If you’re just outside Duarte and need a written quote for sealing, call the same number: (626) 469-5477. We schedule Duct Sealing in Duarte and the surrounding San Gabriel Valley communities on the same route system, so wait times stay short.
Serving Duarte, CA - Our Local Coverage Area
We’re based in the Duarte area and offer Duarte Dryer Vent Cleaning because we 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 Duarte
Every 3 to 5 years is realistic for Duarte homes with original 1950s-70s sheet metal ducts. The semi-arid climate dries sealant faster than coastal air, and Santa Ana events push fine dust into any small gap. If you live near the 210 Freeway or in the foothills, lean toward 3 years. Call (626) 469-5477 and we’ll inspect yours and tell you what the camera shows.
Yes. Duct sealing measurably reduces the amount of outside air and smoke that enters your living space through duct leaks. A continuous negative-pressure seal keeps smoke from being pulled into the system through open seams, disconnected sections, and open return plenums. That matters in Duarte, where Santa Ana winds carry wildfire smoke from the San Gabriel Mountains directly into foothill neighborhoods. Pair sealing with a media filter from Aprilaire or Honeywell and you have a strong defense.
Most can be sealed effectively. Sheet metal ductwork from that era is sturdy. The failure points are the seams, boots, and tape, not the metal itself. Unless sections are crushed or rusted through, we seal with mastic and foil tape and verify with negative pressure. Replacement is only necessary when the metal is too far gone, and we’ll show you photos from the camera before recommending that step.
Open return plenums and cracked register boots are the two we see most near the 210 corridor. Freeway-adjacent homes pull fine traffic particulates through every gap, and the constant pressure difference makes small leaks bigger over time. Sealing the return side is the priority because that’s where unfiltered air enters the system. Call us for a camera inspection and we’ll show you exactly where your system is pulling air from.
Yes. Cleaning removes dust and debris already inside the ducts. Sealing closes gaps so new dust and outside air cannot get in. In Duarte’s dust-heavy environment, you should do both: clean first to remove what’s accumulated, then seal to keep the system tight. We schedule them together on the same visit when possible. Call (626) 469-5477 for a written quote that covers both.
Written by Roy Castellanos, Owner at Hollis Air Duct Pasadena, serving Duarte with written pricing and a 365-Day Done Right Promise on every job since 2004.