Whole-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.
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AfterHow Much Does Duct Repair & Sealing Cost in Los Angeles?
Duct repair and sealing in Los Angeles typically runs $350 to $950 for a standard single-family home, with most jobs landing near $550. Small fixes like a single disconnected joint or a torn flex-run can cost as little as $180, while whole-house sealing on a larger 1970s ranch home in the Valley often reaches $1,200 or more. The number moves mostly with how much accessible ductwork you have, how many leaks we find, and whether your system runs through a crawlspace, an attic, or a slab.
If you’ve noticed higher-than-usual SoCal Edison bills, rooms that never quite cool down in August, or a faint musty smell when the AC kicks on, leaking ducts are usually the culprit. Most Los Angeles homes we inspect lose somewhere between 20% and 30% of conditioned air through gaps, torn connections, and failed mastic before it ever reaches a register. That’s not a small leak. That’s a fifth of what you paid to cool, escaping into your attic or crawlspace.
Linden Air Duct Cleaning has been serving homeowners since 2004 as part of the Threshold Group family, and we put every price in writing before a single tool comes out of the truck. You’ll know the cost to the dollar before we start. That’s the home standard we hold ourselves to on every job.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what Los Angeles homeowners actually paid across the categories we see most often this year. These are real ranges, not teaser pricing. Every job is quoted in writing first.
| Service | Typical LA Price Range | Notes |
|---|---|---|
| Single joint / connection repair | $180 – $320 | One disconnected or crushed run, usually in an attic |
| Partial duct sealing (up to 10 leaks) | $350 – $650 | Mastic + mesh on accessible runs |
| Whole-house duct sealing | $700 – $1,200 | Seals every accessible joint; attic and crawlspace |
| Full duct section replacement | $450 – $900 per run | Roughly 15 – 25 ft of flex or rigid duct |
| Flex duct re-run (single room) | $300 – $550 | Common in 1950s – 70s San Fernando Valley homes |
| Insulation wrap on exposed ducts | $250 – $500 | Important for attic runs in hot LA summers |
| Duct cleaning (paired with repair) | $300 – $600 | Performed with Rotobrush equipment |
| Diagnostic inspection (with repair) | Free | Waived when we do the repair work |
What pushes a job toward the top of those ranges? Access, mostly. A home in Silver Lake with attic ductwork we can reach in five minutes is a different job from a 1920s Craftsman in Highland Park with ducts tucked behind a low roofline and sealed under old insulation. Every cut, every weld, every reach through a cramped crawlspace adds time. Adding a second story or a room conversion also multiplies the number of runs and joints.
On the lower end, a single failed connection that we can spot and fix quickly stays cheap. Most Los Angeles homeowners land in the middle: a partial sealing job that catches the worst leaks, improves airflow to bedrooms that never got cool, and drops the monthly bill enough to notice by August. If your home has flex duct installed during the 1980s and 1990s, expect more leaks than a house with newer rigid ductwork. Flex duct is more susceptible to tears at the connections and crushing in tight attic spaces.
The other factor is whether you repair only, or pair it with cleaning. Many LA homes have never had the ducts cleaned since they were built. When we open a run to fix a leak, we often find 20 to 40 years of dust, drywall dust from a renovation, and the occasional construction debris. Cleaning at the same time costs less than a separate visit, and it makes the repair work itself more effective. If your ducts haven’t been touched in a decade, it’s worth having both done in one trip. You can read more about that combined approach on our Duct Repair & Sealing in Los Angeles page.
What Affects Duct Repair & Sealing Pricing in Los Angeles
Pricing shifts based on your home, your ductwork, and how much of it we can reach. Here’s what moves the number most in the LA market.
- Access to your ductwork. Attic and crawlspace access in Los Angeles varies wildly. A home in Encino with a full attic walkway is easier to work in than a narrow crawlspace under a Pasadena bungalow. Harder access means more time, and time is most of the labor cost.
- Duct material and age. Older rigid metal ducts can be sealed with mastic. Flex duct installed in the 1990s often needs partial replacement because it tears at the joints and collapses in the heat. Any ductwork over 25 years old should be inspected before we quote.
- Number of leaks found. One leak versus twenty is the single biggest swing in this trade. We don’t guess. We run a pressure test, walk the system, and count what’s actually leaking.
- System size and layout. A 1,200 sq ft home in Culver City has far fewer runs than a 3,000 sq ft two-story in Woodland Hills. Multi-zone systems with two air handlers cost more because there are two sets of ducts to inspect and seal.
- Slab vs. attic ductwork. Some older LA homes have ductwork running under the slab. Breaks there are rare but expensive to reach because we have to tunnel in. Attic and crawlspace work is more common and more affordable.
- Whether you pair cleaning with repair. If your ducts haven’t been cleaned since the house was built, doing both at once saves on the trip charge and often makes the sealing job itself more effective.
Roughly 70% of the Los Angeles jobs we quote come in between $400 and $800. That’s the honest middle. If a company quotes you $99 flat for “duct sealing” without looking at your home first, that price usually turns into something very different by the time the tech is on the roof.
Why duct symptoms in Los Angeles look different than in other markets
The LA climate puts specific stress on ductwork that you don’t see in cooler, wetter parts of the country. Our dry heat cooks attic duct insulation until it crumbles. When attic temps hit 140°F in August, old insulation wrap breaks down, flex duct gets brittle, and joints that were taped 20 years ago begin to peel. If you live in the Valley, North Hollywood, or anywhere inland, that heat is the number one driver of the repairs we schedule.
On the coast, from Santa Monica to Long Beach, the problem is different. Salt air and humidity speed up corrosion of metal duct connectors, and we see more failed joints along the exterior walls. A sealing job in Venice can look completely different from one in Sherman Oaks even when the homes are the same age.
And on top of the weather, older LA homes have specific problems that newer builds don’t. A 1940s Spanish-style home in Mid-City may have ducts that were added during a 1980s remodel and never properly sealed. A post-war tract home in Westchester often has original flex duct reaching the end of its service life. Knowing which neighborhood you’re in tells us a lot about what we’ll find before we even open the access panel.
How to Save on Duct Repair & Sealing
You don’t have to accept the first number that comes your way. Here’s how LA homeowners keep duct repair costs reasonable without sacrificing the fix.
- Get the price in writing before work starts. This is standard practice at Linden Air Duct Cleaning – not a special offer. If a contractor won’t put the price in writing, walk away. A written quote protects you from the “while we were up there we found three more things” surprise invoice.
- Bundle repair with cleaning. If your ducts haven’t been cleaned in more than five years, doing both in one visit usually saves $150 to $250 compared to scheduling two trips.
- Fix leaks before they spread. One disconnected joint in a Woodland Hills attic used to cost $200 to repair. Left alone for two summers, the loose duct tears its insulation, drops debris into the run, and pulls apart a second connection. The $200 job becomes $700.
- Ask about the 365-Day Done Right Promise. Every repair at Linden Air Duct Cleaning comes with a written guarantee, plus a free second visit if the repair fails within the year. That’s a second visit at no charge, not a warranty fee.
- Check for utility rebates. LADWP and SoCalGas occasionally offer rebates for home energy improvements that include duct sealing. Ask the technician to note whether your job qualifies. It doesn’t apply to every home, but it’s worth ten minutes of checking.
- Schedule before the summer rush. We don’t run artificial urgency – no countdown clocks on this page. But every HVAC and duct company in Los Angeles is busier from June through September. Spring bookings give you more scheduling flexibility and often shorter waits. Call (980) 447-2498 for a free estimate, and we’ll tell you honestly whether now or a month from now makes more sense for your home.
Is Duct Sealing Worth It in Los Angeles?
Yes, in most Los Angeles homes it pays back in two to four cooling seasons. If your ducts lose 25% of your cooled air, sealing them reduces that loss to under 10% and cuts your summer cooling cost by roughly 15% to 25%. On a $300 monthly SoCal Edison bill during peak summer, that’s $45 to $75 a month, or $270 to $450 across a single cooling season. Do the math against a $600 sealing job and it recovers itself fast.
The other benefit is comfort, and this is the one LA homeowners talk about more after we finish. Rooms that never quite cooled down start holding temperature. The bedroom over the garage stops being ten degrees hotter than the rest of the house. Dust counts drop because leaks in attic ducts pull insulation fibers into the airstream. It’s the kind of improvement you feel on the first hot day after the work is done.
If you’ve had an HVAC technician tell you the system is fine but the house never feels balanced, duct leakage is the next thing to check. We’ve walked into homes in Burbank, Glendale, and Torrance where the AC was running perfectly and the ducts were the entire problem.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Los Angeles?
Whole-house duct sealing in Los Angeles costs $700 to $1,200 in 2026, with most homes landing near $900. Partial sealing for up to ten leaks runs $350 to $650. Single joint repairs start around $180. Call (980) 447-2498 for an exact quote – estimates are free, and the price we give you is the price you pay.
Is it cheaper to repair or replace ductwork in Los Angeles?
Repair is almost always cheaper when the ductwork is under 25 years old and the failures are localized. A $400 to $800 repair beats a $4,000 to $9,000 full replacement in most cases. Replacement makes sense when the ducts are crushed, contaminated with mold, or more than 30 years old with widespread damage. We’ll tell you honestly which situation you’re in before quoting either.
How much does a single duct leak repair cost in Los Angeles?
A single duct leak repair in Los Angeles costs $180 to $320, including mastic sealing, mesh wrap where needed, and a pressure check afterward. Most single-leak jobs are done in under two hours. If we find more than one leak while we’re up there, we’ll stop and give you a revised written price before continuing. No surprise invoices at the end.
Can you come today if my ducts are leaking badly?
Often, yes. Duct repair is rarely an emergency the way a burst pipe is, but we do offer same-day and 24/7 emergency availability for urgent cases like a fallen duct that’s blowing attic insulation into your living space. Our phones are answered by a live person, day or night. Call (980) 447-2498 and we’ll tell you what’s possible on your schedule.
Does duct sealing really lower my energy bill in Los Angeles?
Yes, typically by 15% to 25% during peak summer cooling months. According to the U.S. Department of Energy, sealing and insulating ducts can improve HVAC efficiency by up to 20%, and Los Angeles’ hot inland summers push that benefit higher than the national average. A $500 to $900 sealing job often returns the cost within two to three cooling seasons.
What’s included in the written guarantee on duct repair?
Every Linden Air Duct Cleaning repair is covered by a written 365-Day Done Right Promise. If a repair we made fails within 365 days, we come back and fix it at no charge. That’s the guarantee in writing, on every repair job, not as a promotional offer.
What Happens When You Call Linden Air Duct Cleaning
We know that letting a stranger into your home is a real decision. Here’s exactly what happens when you call.
A live person answers, any hour of the day or night. No voicemail. No callback queue. You talk to someone who can give you a real answer about your ducts, not a script.
Before the appointment, we send you the name and photo of the technician who’s coming. That’s The Threshold Standard, our on-door protocol since 2004. Every technician is background-checked, identity-verified, and arrives in a clean, marked uniform. When they knock, they’ll show you a photo ID badge without you having to ask.
The inspection is free. The written price comes before work begins. The equipment we use is Rotobrush and Nikro for ductwork, and when air-quality products make sense for your home, we work with Honeywell, Aprilaire, Abatement Technologies, and Guardsman. Every repair gets a written guarantee and a free second visit if anything doesn’t hold.
If you’re weighing duct repair or sealing in Los Angeles, call (980) 447-2498 for a free estimate. We’ll tell you what your ducts need, what it will cost, and what happens if anything falls short. In writing, every time.
Pricing reflects the Los Angeles market as of 2026. Linden Air Duct Cleaning offers free estimates – call (980) 447-2498.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving Los Angeles homeowners since 2004.
What Our Customers Say
"Priced by the system, not by the vent, and he told me up front. No pressure to add the sanitizer and I said no without any fuss."
- Faith N."We had construction dust packed into every register after a remodel. They sealed off the returns, used negative pressure, and left the floors cleaner than they found them."
- Paul E."I liked that I knew who was coming in. Name and photo texted ahead, badge at the door. He was quiet, careful with the furniture, and thorough."
- Cheryl A.