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 Westminster
Duct sealing in Westminster typically runs $450 – $1,200 for a single-system home, and the work usually takes one day once we’re on site. If your house was built between the 1950s and 1970s, there’s a good chance the original ductwork is leaking conditioned air into the crawl space or attic, and every cycle of your HVAC system is pulling fine, silty dust back into the rooms you actually live in. We’ve worked on enough Westminster tract homes to know what that looks like, and we know how to fix it. Call us at (562) 548-7365 and we’ll walk you through what your system needs.
Why Hollis Air Duct Long Beach Is Westminster’s Preferred Duct Sealing Company
Westminster homeowners call us because the price we write down before work starts is the price on the invoice when we leave. That’s The Garrison Standard, and it’s been the rule here since 2004. No bait-and-switch, no surprise line items once the van is parked in your driveway. Roy Castellanos runs our crews on the same principle he’s held since he started: do the job by the book, leave the site clean, and stand behind the work for a full year in writing.
We dispatch from our Los Angeles office, and Westminster is well inside our regular service map. Scheduling is straightforward – you talk to a live person when you call, not a voicemail tree. Our technicians arrive in uniform, background-checked, and they know the difference between a 1962 tract home off Bolsa Avenue and a newer build near the 405. That local familiarity means we can often tell you what’s likely wrong before we even open the crawl space door.
The 365-Day Done Right Promise covers every duct sealing job we do in Westminster. If something fails within a year, we return and fix it at no charge. That includes a free second visit. We put that in writing on every job because that’s what a real guarantee looks like.
Styles & brands we work with
HVAC Duct Sealing in Westminster
HVAC Duct Sealing in Westminster is the process of closing every gap, crack, and loose joint in your ductwork so the air your system heats or cools actually reaches the rooms it’s meant for, instead of leaking into a crawl space or attic. In Westminster’s older homes, this is often the single most effective fix for a house that stays dusty no matter how often you clean, and for rooms that never quite hold temperature. We use mastic sealant – a thick, brush-on compound that hardens over joints and gaps – plus metal tape and, where needed, Aeroseal-style methods for pressurized sealing of hard-to-reach runs. A typical single-family home in Westminster runs $450 – $800 for targeted joint sealing, while full-system sealing with testing runs $800 – $1,200 depending on duct length and access.
Sealing Crawl Space Ductwork
Westminster homes from the 1950s and 1960s almost always have duct runs under the house. Galvanized steel sections were joined at installation, and sixty years later those joints are separated by a quarter-inch or more. That gap is where the silty dust from the Santa Ana River corridor gets pulled in and circulated through every room.
Sealing Attic-Mounted Systems
Homes with attic air handlers often have flex duct that’s been crushed by storage boxes, animal activity, or just age. When a return line is crushed, the system pulls unconditioned attic air directly into the house. Sealing and re-supporting those runs restores pressure and stops the dust problem at its source.
We also carry Honeywell and Aprilaire filtration products for Westminster customers who want to add better particulate capture after sealing work is done. Sealing stops the leaks; good filtration handles what’s left in the air.
Duct Repair in Westminster
Duct Repair in Westminster is what happens when sealing isn’t enough because the duct itself has failed – a run has collapsed, disconnected entirely, or been crushed beyond reuse. Our crews in Westminster most often find disconnected return ducts in crawl spaces on homes built between the 1950s and 1970s, and crushed flex runs in attics where someone stored holiday decorations on top of the ductwork. Repair costs in Westminster typically run $300 – $700 for a single run repair, depending on access and the length of duct being replaced, while larger repairs involving multiple runs or a new return drop can push toward $900 – $1,500.
Reconnecting Disconnected Runs
When a duct separates at the boot or at a mid-run joint, every cycle of your HVAC unit pulls in whatever’s around the gap. In a Westminster crawl space, that’s decades of fine dust from Santa Ana wind events. Reconnecting and sealing the run restores airflow to registers that have gone weak.
Replacing Crushed Flex Duct
Flex duct in attics gets flattened by storage, foot traffic, or simply time and gravity. A crushed return can cut airflow by half or more, which makes the system work harder and sends your utility bill up every month. Replacement is straightforward, and we quote it before we start.
Trusted Brands We Service in Westminster
Most Westminster homes have equipment built around common brands, and we service and seal ductwork connected to all of them. We work regularly with Honeywell and Aprilaire filtration components, and when sealing reveals airflow or filtration gaps, we can source what’s needed quickly for Westminster jobs. We also use professional-grade sealing materials and equipment from Abatement Technologies and Guardsman on our trucks. That means we’re not running to a hardware store mid-job; the right materials are already on hand.
Common Duct Sealing Problems We See in Westminster Homes
- Original galvanized joints separating in crawl spaces. Homes along Westminster Boulevard, Bolsa Avenue, and the neighborhoods west of Beach Boulevard were largely built in the 1950s and 1960s, and the original ductwork is still down there. The mechanical fasteners and early tape have failed, and the gaps are pulling in whatever is floating in the crawl space air.
- Santa Ana dust re-entering through return leaks. Every time the wind kicks up, fine particulate makes its way into crawl spaces and attics through exterior vents. A leaky return duct becomes a direct pathway for that dust to get into the house and onto every surface.
- Crushed flex duct in attics. Attic-mounted systems from the 1970s era often used flex duct, and decades of storage, pest activity, and the occasional contractor walking through have crushed sections flat. Airflow drops, rooms get stale, and the system runs longer just to keep up.
- Disconnected boots where ducts meet floor registers. We routinely find the connection between duct and register boot has come loose or was never properly sealed in the first place. Those leaks push conditioned air under the house instead of into the room.
See the difference
Before
After
Before
After
Before
AfterPricing for Duct Sealing in Westminster, CA
Here’s what Westminster homeowners can expect to pay. Targeted sealing of the supply and return runs in a single-system home typically runs $450 – $800. Full-system sealing with before-and-after airflow testing runs $800 – $1,200. Duct repair on top of sealing – reconnecting a separated run, replacing a crushed section – adds $300 – $700 depending on what we find in the crawl space or attic. The price is written before we start, and it does not move at the door. Not for the size of the job, not for “extra materials,” not for anything. Call (562) 548-7365 and we’ll give you a written number for your house specific system.
We Also Serve Cities Near Westminster
Our crews regularly handle Duct Sealing work in Huntington Beach, Stanton, Garden Grove, and Seal Beach. If you’re in a neighboring city and dealing with the same dusty-house problems we see throughout Westminster, the same written pricing and 365-Day promise apply.
Serving Westminster, CA - Our Local Coverage Area
We’re based in the Westminster 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 Westminster
Homes from that era have 50 to 60 years of material fatigue on original galvanized or early flex ductwork, and the joints and connections were never sealed to modern standards. Newer homes benefit from better installation practices and tighter building envelopes, which means less dust infiltration and fewer separated runs. If you live in a tract home built between the 1950s and 1970s in neighborhoods off Bolsa Avenue or west of Beach Boulevard, your ducts have likely been leaking for decades. Call (562) 548-7365 for an inspection and a written quote.
Yes, and we do it regularly throughout Westminster. Duct sealing work in a crawl space does not touch the foundation – we access the existing crawl space entry, work on the ducts themselves, and leave the structure exactly as we found it. Our technicians navigate the space carefully, and we leave the site clean when we’re done. If you’re unsure about access to your crawl space, we can assess it before quoting so you know exactly what to expect.
The clearest signs are rooms that never reach the temperature you set, weak airflow at certain registers, and dust that returns within days of cleaning. In Westminster’s older tract homes, we also see dust that’s clearly from crawl space or attic air – fine and silty, not the normal indoor lint and skin-cell dust. A camera inspection of your ducts will show disconnected runs or gapped joints if they’re present. We can run that inspection and show you what we find before any sealing work is quoted.
Late fall and winter are ideal, because the mild weather means your HVAC system isn’t running at full load while we work, and we can access crawl spaces and attics without fighting the summer heat. But sealing can be done year-round in Westminster – the work is inside your duct system, not outside in the weather, so a Santa Ana day or a winter drizzle doesn’t stop a well-equipped crew. Call (562) 548-7365 and we can usually schedule within a week or two.
Yes, and in many cases it’s the only thing that actually solves it. Cleaning removes what’s already inside the ducts, but if the return lines are still pulling dirty crawl space or attic air through gaps, the dust comes right back. We seal the leaks so the only air entering your ducts is the air from inside your home. That’s the fix, not just the treatment. For a written quote on sealing your Westminster home’s ductwork, call (562) 548-7365.
Ready to Fix the Dust Problem at the Source?
If your Westminster home was built decades ago and the dust keeps coming back no matter what you do, the problem is probably in the ducts, not in how often you clean. We’ll inspect the system, show you what we find, quote a written price for sealing and repair, and stand behind the work for a full year under the 365-Day Done Right Promise. Call (562) 548-7365 for a free estimate, and talk to a live person who can answer your questions without a script.
Written by Roy Castellanos, Owner at Hollis Air Duct Long Beach, serving Westminster and the surrounding Orange County area since 2004.