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.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
See the difference
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After
Before
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Before
AfterHow Much Does Duct Repair & Sealing Cost in North San Jose?
Duct repair and sealing in North San Jose typically runs about $350 to $1,600 for a whole-house job, with most single-room or single-branch fixes falling between $185 and $450. A full duct replacement, when the system is past saving, lands higher. Those are the ranges we see across this market in 2026, and the written estimate you get on site is what sets the final price.
The spread is wide because a duct system in North San Jose can fail in a lot of small, specific ways. A run of flex duct that pulled loose at a boot behind a kitchen cabinet is a different job from a trunk line that’s shedding its inner liner after years of hot, dry summers. Sealing is often the cheaper fix, and it’s the one worth asking about first.
Key Takeaways
- Most North San Jose duct repair jobs land between $350 and $1,600; small branch fixes start around $185.
- Sealing a whole system usually costs less than replacing a section of ductwork and delivers the same comfort result when the ducts are intact.
- Flex duct and older metal trunk lines fail differently, so the diagnosis drives the price more than square footage does.
- Attic runs in this climate take a beating from summer heat, which is where we find the most disconnected joints.
- Estimates are free, and the price is set per job in writing before any work starts.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the line items usually price out for homes in North San Jose and the surrounding neighborhoods. These are typical ranges, not quotes. The size of the system, how accessible the ducts are, and how much of the run needs work are what move a job up or down within these numbers.
| Line item | Typical 2026 range |
|---|---|
| Single branch or register repair (disconnected boot, collapsed flex run) | $185 – $450 |
| Reconnecting and resealing a section of trunk line | $350 – $800 |
| Whole-house duct sealing (mastic and foil tape, sealing at every joint) | $550 – $1,600 |
| Insulated flex duct replacement, per run | $225 – $550 |
| Rigid metal duct replacement, per section | $400 – $1,200 |
| Airflow balancing and register adjustment after repair | $150 – $400 |
| Duct cleaning bundled with repair (debris removal before sealing) | $450 – $1,100 additional |
What pushes a job toward the top of these ranges? Mostly access. A duct that runs through an open attic or a garage soffit is quick to reach. A duct buried above a hard ceiling, or one that disappears behind cabinetry in a townhome, takes more time and more care. We see a lot of both in North San Jose, where the housing stock runs from older single-story ranch homes to newer attached townhomes with tight mechanical chases.
The other big driver is whether we’re repairing or replacing. Sealing a joint that’s still sound inside is cheap. Replacing a run that’s crushed, torn, or coated inside with debris is not, because it has to come out and go back in. That’s the core reason we inspect with a camera before quoting, so you’re paying for what’s actually wrong rather than a guess.
What Affects Duct Repair & Sealing Pricing in North San Jose
Five things move the price more than anything else. Knowing them helps you read an estimate and ask the right questions.
- Duct material and age. Flexible insulated duct is common in newer construction and fails at the joints and boots. Older rigid metal duct can lose its seams or flex apart. Metal replacement costs more per foot because of the labor, so the material alone shifts the quote.
- Access to the run. Attic runs, crawl spaces, and garage soffits are reachable and keep labor down. Ducts chased inside a wall or buried above a finished ceiling require drywall work, and that pushes a job toward the top of the range.
- Number of problem points. One disconnected boot is a small job. Six or eight leaking joints across the system becomes a whole-house sealing scope, which is where the $550 to $1,600 band comes from.
- Local summer heat. North San Jose summers are long and dry, and attic temperatures climb high enough to break down the adhesive on flex duct over time. That’s why we find so many failed seams and pulled boots rather than just dust problems.
- Whether you’re bundling cleaning. If a system has never been cleaned, debris has to come out before sealing makes sense. Combining air duct cleaning with a repair is often more economical than booking them separately, and it means one visit instead of two.
- Air-quality context. If there’s visible biological growth or heavy fine particulate in the system, the job involves more than sealing. That’s where our Abatement Technologies equipment and HEPA-rated Nikro vacuums come in, capturing contaminants rather than blowing them through the house.
For a broader view of how we approach ductwork across this part of the city, see North San Jose. It’s the same equipment and the same diagnosis-first process, whether you’re in a condominium near the transit corridor or a single-family home near the foothills.
How Does the Repair Actually Work?
Duct repair isn’t a matter of taping over a leak and moving on. The process starts with inspection: we push a camera through the system and look at every accessible joint, boot, and trunk connection. From there the work falls into a few categories.
- Reconnecting. Flex duct that has pulled off a boot or plenum gets reattached and mechanically fastened, then sealed properly with mastic rather than just tape.
- Sealing. Every seam, joint, and penetration gets sealed. This is the step that recovers the conditioned air you’ve been paying to cool and then losing into the attic.
- Replacing. Crushed, torn, or collapsed sections come out and get replaced with the correct material for the run.
- Cleaning before or after. Debris gets removed with our Rotobrush rotary-brush system and pulled into a Nikro HEPA vacuum, so what’s dislodged leaves the system instead of settling back down.
We repair what we find, not just clean around it. That’s a meaningful difference in a market where most companies offer cleaning alone and hand off repairs to someone else.
There’s a safety point worth flagging here, too. Ductwork carrying combustion byproducts from a gas furnace is not a DIY repair. A poor connection on a flue-adjacent run can create a real health and fire hazard. If you’re looking at ductwork near the furnace, that work belongs with a trained technician, and we’ll say so on site if we find it. Better air starts at the source, and sometimes that means a professional call rather than a roll of tape.
Can You Fix Duct Leaks the Same Day?
Often, yes. Single-branch fixes and straightforward joint repairs are commonly handled in one visit, especially when the ducts are accessible.
Whole-house sealing takes longer and we’ll give you a realistic time window in the written estimate. If your duct issue shows up on a Saturday, we’re closed that day, but call us and we’ll book you for Sunday. Call (855) 506-8636. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
What happens when you call is simple. We ask a few questions about the symptom (rooms that won’t cool, whistling registers, dust on the registers) and the age of the system, then set an inspection. From there you get a written estimate, free of charge, before anything gets repaired. No surprises on the invoice.
Duct Sealing vs. Duct Cleaning: Which Do You Need?
They solve different problems, and confusing them is how homeowners end up paying for the wrong service. Cleaning removes what’s inside the duct. Sealing fixes what’s wrong with the duct itself. Repair restores the parts that have failed.
- You likely need cleaning if registers are dusty, the system smells musty, or the house has never had the ducts serviced.
- You likely need sealing if some rooms never get comfortable, you feel air blowing from attic penetrations, or energy bills have crept up without a change in habits.
- You likely need repair if a run is visibly disconnected, crushed, or hanging loose in the attic.
In a lot of homes the answer is a combination, and that’s where doing both in one engagement saves money and disruption. Our Elmwood Air Duct Cleaning team handles cleaning, repair, and sealing under one roof, which means the diagnosis and the fix happen in the same visit rather than across three contractors.
How to Save on Duct Repair & Sealing
There’s no magic discount here. The savings come from doing the right scope at the right time.
- Seal before you replace. If the ducts are structurally sound, sealing is almost always cheaper than replacement and gets you the same comfort result. Ask whether sealing is enough before you agree to a full replacement quote.
- Bundle cleaning with repair. One visit, one setup, one dispatch. Combining the two is typically more economical than booking separately.
- Fix small leaks now. A single disconnected boot is a small job. Left alone, the debris and moisture it lets in can turn into a bigger one. Addressing leaks early keeps you in the low band.
- Ask for the written estimate and read the scope. The line items tell you what’s being sealed, replaced, or cleaned. Clarity here protects your wallet.
- Keep the filter clean. A clogged filter makes the blower work harder and stresses flex duct joints. It’s the cheapest maintenance you can do.
Estimates are free. Call (855) 506-8636 and we’ll set up an inspection. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Dryer Vent Repair: The Safety Service Most People Skip
Duct repair and sealing covers the HVAC system. The dryer vent is a separate run of ductwork with its own failure mode, and it’s one worth mentioning because it’s a fire risk, not just an efficiency issue. Lint accumulates, airflow drops, and the combination is a leading cause of residential dryer fires. We treat dryer vent cleaning as a standalone safety service rather than an afterthought, and it fits naturally into a duct visit if you’re already having work done.
If you’re booking duct repair, it’s a reasonable moment to have the dryer vent checked too. One trip, both addressed. You can read more about our full scope on the Elmwood Air Duct Cleaning home page, but the short version is that we clean, repair, and handle dryer vents under one roof.
Why Equipment Matters for the Price You Pay
You’ll see low duct repair quotes in North San Jose, and they usually reflect a shop vac and a roll of foil tape. That’s not a long-term fix. We run professional-grade gear for a reason: Rotobrush rotary-brush systems to actually dislodge compacted debris from the duct wall, and Nikro HEPA-rated vacuums to capture what comes loose instead of recirculating it into the room. For jobs involving fine particulates or biological contamination, we bring Abatement Technologies equipment to the site.
That equipment cost is built into the ranges above, and it’s the difference between a repair that holds and one that gets redone next season. We’re also familiar with Aprilaire and Honeywell integrated air-quality systems, so if your home has whole-home filtration or humidity control, we can work with it rather than around it.
Elmwood Air Duct Cleaning has served this market since 2018. That’s 8 years of seeing what fails first in Bay Area homes and why. Our approach has stayed consistent: find the actual problem with a camera, quote it in writing, and repair what we find rather than cleaning around it.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in North San Jose?
Whole-house duct sealing in North San Jose typically runs $550 to $1,600 in 2026, depending on how many joints and runs need attention. Small, targeted sealing jobs start around $185. The written estimate sets the final price. Call (855) 506-8636 for an exact quote.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper when the duct material is still structurally sound, and sealing a system usually costs far less than replacing a section of run. Replacement only makes sense when a run is crushed, torn, or collapsed, and then it’s the only fix. Getting the inspection first tells you which side you’re on. Estimates are free, so call (855) 506-8636.
Can you come today?
In many cases, yes. Single-branch duct repairs are commonly handled same-day when the run is accessible. If you’re calling on a Saturday, we’re closed that day, but we’ll book you for Sunday. Call (855) 506-8636. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
How much does it cost to fix one disconnected duct?
A single disconnected boot or register typically costs $185 to $450 in North San Jose, including reconnection and proper sealing. It’s the smallest job we do and one of the most common in this climate, where attic heat loosens connections over time. Call (855) 506-8636 for a quote on your specific run.
Does duct sealing really lower my energy bill?
Sealing duct leaks in the attic recovers conditioned air that’s currently escaping, which reduces how hard your system has to work. The savings depend on how leaky the system was to begin with. We can’t promise a percentage, but a system with multiple failed joints is doing measurable extra work, and sealing those joints changes what the system has to overcome. Call (855) 506-8636 to schedule the inspection.
What’s the difference between duct repair, duct cleaning, and duct sealing?
Repair fixes broken ducts (disconnected, crushed, or torn runs). Cleaning removes debris from inside the ducts. Sealing closes leaks at joints and seams. Most homes need one or a combination, and the inspection determines which. We handle all three so there’s no handoff to another company. Call (855) 506-8636.
Get a Straight Answer on Your Duct Problem
Duct repair and sealing pricing in North San Jose depends on the system, the access, and how many points are failing. What we won’t do is quote blindly over the phone or pad a number to cover the unknown. We inspect, we tell you the scope in writing, and the price follows from there.
Call (855) 506-8636 to book a free estimate. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. Whether your ducts need a single reconnect or a full-house seal, we’ll give you the plain-English version before any work starts. Professional-grade equipment, honest diagnosis, and repair rather than cleaning around the problem. That’s how we’ve worked in this market since 2018.
Pricing reflects the North San Jose market as of 2026. Elmwood Air Duct Cleaning offers free estimates – call (855) 506-8636.
Written by the team at Elmwood Air Duct Cleaning, serving North San Jose since 2018.
What Our Customers Say
"They photographed every return and supply before starting and sent me the file afterward. No upsell to a sanitizing treatment I didn't need."
- Steven Wong"Quoted per system rather than the bait and switch per vent pricing everybody else in town uses. The number I was told on the phone was the number on the invoice."
- Lucia Delgado"Told me straight that our ducts were in decent shape and didn't need doing every year like the mailer companies claim."
- Javier Flores