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 La Cañada Flintridge
Duct sealing in La Cañada Flintridge is a different job than it is down the hill. Most homes here were built between the 1950s and 1990s, and many still run on their original sheet-metal ductwork. The seams that were sealed decades ago are now brittle, peeled, or gone entirely, which means your system is pulling air from attics and crawlspaces instead of pushing it into your rooms. We see it every week in La Cañada Flintridge, and we fix it with a written price before any work starts. Call (626) 469-5477 to schedule a duct inspection and get a straight answer about what your system actually needs.
Why Hollis Air Duct Pasadena Is La Cañada Flintridge’s Preferred Duct Sealing Company
We’ve spent years working inside La Cañada Flintridge homes, and the patterns are consistent. The original duct tape from the 1960s dries out and peels at the joints in hot attics, opening gaps that pull in insulation, dust, and rodent debris. Long flex runs above garages and through crawlspaces get crushed by stored items or simply sag over time, cutting airflow to far bedrooms and throwing the whole system out of balance. Older return cans in vaulted ceilings lose their seal at the drywall, so the system pulls attic air and eucalyptus pollen directly into the living space. Our techs arrive uniformed and background-checked, and they work under The Garrison Code: arrive inside the quoted window, price the job in writing before touching anything, do the work by the book, and leave the site clean. Roy Castellanos leads our team, and every job carries the 365-Day Done Right Promise. If the sealing fails within a year, we come back and make it right at no charge, including a free second visit.
Styles & brands we work with
Duct Insulation in La Cañada Flintridge
Duct insulation in La Cañada Flintridge usually means wrapping exposed duct runs in unconditioned spaces: attics that hit 120 degrees in August, crawlspaces that stay damp through winter, and garage ceilings where the air temperature swings with the seasons. When ducts run through these spaces without insulation, the air inside them loses heat in winter and gains heat in summer before it ever reaches the room. We insulate with R-8 duct wrap, which is the standard for residential systems, and the work typically runs $600 to $1,400 depending on how many linear feet are exposed and how difficult the access is. The payoff shows up as more consistent room temperatures and a lower load on the blower motor.
What Failing Insulation Looks Like
The original wrap on a 1980s La Cañada home is often torn, compressed, or missing entirely. Rodents in foothill crawlspaces chew through fiberglass wrap to nest. The result is condensation on the duct surface in summer, which drips and creates moisture problems nobody wants in a crawlspace.
When to Insulate vs. Seal
You can’t insulate your way out of a leak. But you can seal a leak only to find the duct is still losing energy through thin, deteriorated wrap. Our techs evaluate both at the same time, so you don’t pay for one fix and still have the other problem.
HVAC Duct Sealing in La Cañada Flintridge
HVAC duct sealing in La Cañada Flintridge is usually a restoration job, not a quick caulk-and-go. That’s because homes here have custom duct layouts with long runs through attics and crawlspaces, multiple zones, and original metal that’s been in place for 30 to 70 years. We seal joints with mastic and UL 181 foil tape, the same materials specified in California energy codes, and we pressure-test the system before and after so you know what actually changed. Typical whole-system sealing on a large custom home runs $800 to $2,200, with the higher end covering multi-zone systems with crawlspace access. It’s labor-intensive work, and that’s the honest reason it costs what it costs.
What We Found Off Foothill Boulevard
On a cul-de-sac off Foothill Boulevard, our techs found a 1980s two-zone system where the return duct in the crawlspace had separated at a takeoff, pulling in oak leaf litter and fine ash from the chaparral. We resealed the run with mastic and UL 181 foil tape, insulated the exposed section with R-8 duct wrap, and verified negative pressure at the air handler before turning the blower motor back on. That house had been cleaned twice by another company, and the dust came back both times because the leak was never sealed.
Why Pressure Testing Matters
You can’t see most duct leaks. They’re inside walls, above vaulted ceilings, and under the house. A pressure test measures total system leakage in cubic feet per minute, and that number tells you if your ducts are tight enough to bother cleaning, or if the cleaning is just going to be undone by the next Santa Ana wind pulling ash into the gaps.
Trusted Brands We Service in La Cañada Flintridge
Most La Cañada Flintridge homes run on custom duct systems, not single-brand packages. Our techs work with ducting and filtration products from Aprilaire, Abatement Technologies, and Rotobrush, and we pair sealing work with compatible filtration upgrades when a system needs it. We keep common sealing materials, mastic, foil tape, and R-8 wrap on our trucks, so a typical La Cañada Flintridge sealing job starts and finishes without running back for parts. That matters when you’ve taken time off work and the clock is ticking.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in La Cañada Flintridge Homes
- Failed 1960s tape in hot attics. The original duct tape on older metal seams turns brittle after 40 or 50 years of heat cycling. We find joints where the tape has completely detached, leaving a half-inch gap that pulls attic insulation into the air stream.
- Crushed flex duct in crawlspaces. Homes in La Cañada often have storage in the crawlspace, and flex duct doesn’t survive things stacked on top of it. Crushed runs restrict airflow to far bedrooms, making some rooms 10 degrees warmer than the rest of the house.
- Return leaks at vaulted ceilings. A return can that’s lost its seal at the drywall pulls attic air directly into the living space. After a Santa Ana, that means eucalyptus pollen and fine ash show up in the house even when windows are closed.
- Asbestos tape on original metal joints. Many 1950s – 1970s homes here still have asbestos-containing tape on duct seams. We don’t disturb it. We encapsulate over it with mastic and foil tape, which is the safe and code-compliant approach.
Pricing for Duct Sealing in La Cañada Flintridge, CA
For most homes in La Cañada Flintridge, you should budget between $800 and $2,200 for whole-system duct sealing. Smaller jobs, like sealing a single return leak or a short run, start around $350 to $600. The variables that move your number are the size of the house, how many zones you have, how much of the ductwork sits in a crawlspace versus an attic, and whether we need to replace crushed flex rather than just seal it. The price is always written down before we touch anything, and it doesn’t move at the door. Call (626) 469-5477 for a free estimate on your system, and we’ll tell you exactly what you’re looking at.
We Also Serve Cities Near La Cañada Flintridge
Our service area for Duct Sealing work covers the communities around La Cañada Flintridge, including Pasadena, Glendale, Burbank, and Downtown Los Angeles. If you’re in one of those areas, you can read more about what we do at our La Cañada Flintridge service page. Wherever you are, the pricing standard and the 365-Day Done Right Promise stay the same.
Serving La Cañada Flintridge, CA - Our Local Coverage Area
We’re based in the La Cañada Flintridge 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 La Cañada Flintridge
Rattling usually means a joint has separated or a section of duct has come loose from its hanger, both of which can often be fixed with proper sealing and re-hanging. Full replacement is only necessary when the metal itself is rusted through or so badly deteriorated it can’t hold a seal. In our experience, roughly 8 out of 10 La Cañada systems with rattling are fixable with targeted sealing work. Call (626) 469-5477 and we’ll inspect your runs and tell you whether sealing is enough.
That dust smell after a wind event is a strong sign your return duct has a leak pulling attic or crawlspace air into the system. Cleaning removes what’s already in the ducts, but if the leak stays open, the next Santa Ana fills them again. Sealing first, then cleaning, is the order that actually holds up in La Cañada Flintridge.
Dust on furniture within a day of cleaning usually means a return-side leak, not a supply-side problem. Many older La Cañada homes have return cans that lost their seal at the drywall years ago, so the system pulls unfiltered attic air into the living space. Pressure testing finds leaks that visual inspections miss, and sealing those returns stops the dust at its source. We’ll test your system and show you the before-and-after numbers.
Crushed flex duct can’t be sealed back to full flow. Once the inner coil is flattened, the duct has to be replaced in that section. We’ll replace the crushed run with new flex, seal the connections at both ends with mastic and foil tape, and verify airflow at the bedroom register before we leave. Most crawlspace replacements in La Cañada run $300 to $700 per run depending on length and access.
We don’t remove asbestos tape. We encapsulate it in place using mastic and UL 181 foil tape, which is the code-compliant method for sealing without disturbing asbestos-containing material. The encapsulation seals the joint just as effectively as if the old tape were gone, and it keeps the asbestos safely contained. Roy Castellanos and our techs have handled dozens of these systems in La Cañada Flintridge, and the result is a tight duct run with no hazard left behind.
Ready to get your ducts sealed? Call (626) 469-5477 for a free, no-pressure estimate. We’ll inspect your system, write the price down before any work begins, and stand behind it for a full year.
Written by Roy Castellanos, Owner at Hollis Air Duct Pasadena, serving La Cañada Flintridge with duct sealing, duct insulation, and air duct cleaning.