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 East Los Angeles
Duct sealing in East Los Angeles usually costs between $850 and $2,400 for a full system, depending on how many leaks we find and whether duct sections need replacing rather than just sealing. Most jobs are done in a single day, and the fix is permanent when we use mastic and UL 181-rated tape on every accessible joint, not aerosol sprays that wash out in a few years. If you’ve noticed weak airflow at the vents in a Boyle Heights bungalow or a Belvedere Park rental unit, or if certain rooms never reach the temperature on your thermostat, leaking ducts are usually the cause. Call us at (626) 469-5477 and we’ll schedule a camera inspection of your ductwork, give you a written price before any work starts, and seal what’s actually leaking, not what’s easy to reach.
Older homes in East Los Angeles were built tight against the street, and most still have their original duct runs. That’s what we work with every week. You don’t need someone to sell you a full replacement unless the ducts are crushed or collapsed. Often the real problem is a disconnect in the attic or a seam that’s been leaking since the Nixon administration.
Why Hollis Air Duct Pasadena Is East Los Angeles’s Preferred Duct Sealing Company
Our crews are in East Los Angeles most days of the week. We know the difference between a 1920s craftsmans near Whittier Boulevard and a 1970s stucco box in City Terrace, because the ductwork inside them fails in completely different ways. That local knowledge saves you money: we don’t guess, we inspect with a camera, and we seal only what’s actually leaking. Roy Castellanos runs our operation with one rule: the price goes in writing before we touch anything, and that price does not move at the door.
We’ve sealed ducts in East Los Angeles homes where the previous contractor quoted a full replacement before even looking in the attic. When we put a camera in, the fix was four hours of mastic and new tape. That’s the difference between a company that sells ductwork and a company that fixes it. Our Duct Sealing team works from a written scope, and every job is covered by the 365-Day Done Right Promise: if the seal fails within a year, we come back and make it right at no charge. That’s in writing, not a handshake.
Phones are answered by a live person 24/7. You’ll get a technician in a uniform, background-checked, who introduces themselves by name and walks you through what they found before asking you to sign anything.
Styles & brands we work with
HVAC Duct Sealing in East Los Angeles
HVAC Duct Sealing in East Los Angeles is the process of locating and closing every air leak in your duct system so the air you paid to heat or cool actually reaches the rooms, not the attic or crawlspace. In a typical East Los Angeles home built before 1980, we find leaks at the plenum connection, at every register boot, and along longitudinal seams in the original sheet metal. A full sealing job for a 1,200 to 1,800 square foot home here runs $900 to $1,800, and if sections of duct have to be rebuilt because they’re crushed or torn, the total can reach $2,400.
Mastic and Mechanical Fastening
We use water-based mastic applied with a brush, not duct tape. Duct tape fails in attics within two years because the adhesive dries out in the heat. Mastic hardens into a permanent shell over the joint. On gaps wider than a quarter inch, we use UL 181-rated foil tape as a bridge, then mastic over it.
Camera Inspection Before Sealing
Without a camera inspection, any sealing job is a guess. We push a small camera through every accessible run before we seal. In East Los Angeles homes, we commonly find disconnected flex ducts from DIY renovations, open runs where a previous contractor removed a room, and crushed returns under crawlspaces. Sealing the main trunk while ignoring those open runs would leave the system underperforming, and you’d be paying for half a fix.
Duct Repair in East Los Angeles
Duct Repair in East Los Angeles means fixing what can’t be sealed: crushed returns, disconnected branch lines, sections where the duct material itself has rotted or delaminated. In older East Los Angeles homes, original fiberglass duct boards from the 1950s through 1970s often lose their facing and leak at every seam. At that point, sealing alone won’t hold; the section needs to be replaced or re-wrapped, then sealed at the new connections. Repair work adds $150 to $600 per section depending on access and material, on top of the sealing price.
Crushed and Disconnected Runs
Our tech recently sealed ductwork in a Boyle Heights stucco home where a camera inspection revealed a crushed return duct under the crawlspace, likely from decades of shifting soil during Santa Ana winds. We repaired the run and used mastic and UL 181-rated tape on all accessible joints. The blower motor was pulling nearly 30% less amperage afterward, and airflow at the registers went from whisper-quiet to a steady push.
When Sealing Isn’t Enough
If a duct has collapsed or torn open, no amount of mastic will fix it. We’ll show you the camera footage, explain what we’re seeing, and quote the repair separately before any work starts. You approve the number first. We don’t discover problems after the fact and hand you a bigger invoice.
Trusted Brands We Service in East Los Angeles
We work on every major brand installed in East Los Angeles homes, and we stock parts for most of them on our trucks so we don’t have to leave mid-job to chase a fitting. Our sealing materials include mastic and UL 181-rated tape, and our inspection and cleaning equipment comes from Rotobrush and Nikro, the same gear commercial HVAC crews use. For filtration, we service and install products from Honeywell and Aprilaire when a home needs better air after the ducts are sealed. If your system has a proprietary boot or an odd-sized plenum connection, we’ll know what we’re looking at when we arrive, because we see these systems across East Los Angeles every week.
Common Duct Sealing Problems We See in East Los Angeles Homes
- Original fiberglass duct boards losing their facing. Homes built between 1950 and 1975 in East Los Angeles often have duct board, not sheet metal. The inner facing degrades, fibers enter the airstream, and seams leak everywhere. Sealing these without re-wrapping the worst sections means the job fails within months.
- DIY renovations disconnecting flex ducts. When rooms get added or AC units get swapped, attic flex ducts often get pulled loose and never reconnected. Sealing the main trunk won’t fix an open run; the camera inspection finds these in minutes.
- Grease-laden dust on duct interiors. Decades of indoor cooking with oil coats the inside of ducts in many East Los Angeles homes. Applying mastic over that layer won’t bond; the sealant peels away under airflow. We clean the sealing surface properly before any mastic goes on.
- High static pressure from retrofitted systems. Many Boyle Heights and unincorporated East LA homes still run evaporative coolers or central HVAC retrofitted decades ago. The blower pushes against old, restrictive ductwork and finds every weak seam. Sealing here isn’t about luxury; it’s about keeping conditioned air from escaping into the attic.
See the difference
Before
After
Before
After
Before
AfterPricing for Duct Sealing in East Los Angeles, CA
A full HVAC duct sealing job in East Los Angeles typically runs $850 to $1,800 for homes up to 1,800 square feet. Larger homes or those needing significant duct repair push toward $2,400. The variables are access (attic vs crawlspace), how many runs need sealing, and whether any sections need replacing rather than sealing. You get one flat price per system, in writing, before work starts. No per-vent pricing, no add-ons once the van is in your driveway. Estimates are free; call (626) 469-5477 and we’ll set a time that works for you, including evenings and weekends.
We Also Serve Cities Near East Los Angeles
Our crews work throughout the San Gabriel Valley and neighboring areas, including Pasadena, Glendale, Downtown Los Angeles, and Burbank. If you’re in one of those cities and need the same written-price, camera-first approach to duct sealing, we’re a short drive away. For a full look at how we work across the region, see our Duct Sealing in East Los Angeles page or call us directly at (626) 469-5477.
Serving East Los Angeles, CA - Our Local Coverage Area
We’re based in the East Los Angeles 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 East Los Angeles
Santa Ana winds push fine dust and grit into attics and crawlspaces, and that abrasive dust accelerates wear on any sealing material not suited to the conditions. We use heavy-bodied mastic that stays flexible and doesn’t dry out in low humidity, and we avoid foil tape alone on any joint; mastic over tape is the standard in East Los Angeles because it holds up to the dust and the seasonal temperature swings.
Yes. Evaporative coolers move high volumes of air at low static pressure, and that airflow still finds leaks. We seal the ductwork the same way we would for a central AC system, and we pay attention to the transitions at the cooler plenum where leaks tend to concentrate. If the cooler is being retired and replaced with a central system, we’ll note what needs to change in the duct layout before you buy equipment. Call (626) 469-5477 for an exact quote on your setup.
We run a camera through every accessible duct run. The camera shows us disconnects, crushed sections, and failed seams without opening walls. In 1950s homes with original ductwork, most leaks are at the plenum, the register boots, and the longitudinal seams, all of which are accessible from the attic or crawlspace. We only cut drywall if the duct itself is inside a wall and must be replaced, and we’ll tell you that before we start.
In many cases, yes. Older apartment buildings in unincorporated East LA often have undersized ducts or registers that were closed off during renovations, and sealing alone won’t fix an undersized system. But if the ducts are adequately sized and the airflow is weak, leaks are the most common cause. We’ll inspect, show you the footage, and tell you honestly if sealing will solve the problem or if you need a different fix. You’ll know before any money changes hands.
We use water-based mastic rated for HVAC duct sealing and UL 181-rated foil tape for bridging wide gaps, the same materials specified by commercial HVAC codes. We don’t use hardware-store duct tape, which fails in attics within two years. On older stucco homes where the attic heat is intense, the mastic stays flexible and holds for the life of the duct. Call (626) 469-5477 and we’ll walk you through exactly what we use and why.
Call Hollis Air Duct Pasadena for Duct Sealing in East Los Angeles
If your East Los Angeles home has weak airflow, rooms that never reach the thermostat setting, or ducts that haven’t been inspected in decades, start with a camera inspection. We’ll show you exactly what’s leaking, give you a written price to seal it, and stand behind the work for a full year under the 365-Day Done Right Promise. Call (626) 469-5477 today or any time; a live person answers, and we’ll get you scheduled.
Written by Roy Castellanos, Owner at Hollis Air Duct Pasadena, serving East Los Angeles with written pricing and the 365-Day Done Right Promise.