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
Before
After
Before
After
Before
AfterHow Much Does Duct Repair & Sealing Cost in Cupertino?
Duct repair and sealing in Cupertino typically runs $240 to $650 for most single repairs, and $600 to $1,400 for a whole-home sealing project that treats every accessible joint and gap. A straightforward patch on one disconnected flex run lands near the bottom of that range. A house with crushed returns and twenty years of leaky joints sits at the top. We give exact numbers after we’ve seen the ducts, not from a phone script.
Those ranges are real for the Cupertino market in 2026, not a national average pulled off a template. Silicon Valley labor rates, the age of the housing stock here, and the way this climate stresses ductwork all push the number around. We’ll walk through each one below.
Key Takeaways
- Most single-point duct repairs fall between $240 and $650.
- Whole-home duct sealing runs $600 to $1,400, depending on the number of runs and how much access we have.
- Crushed flex duct replacement averages $180 to $400 per run.
- Cupertino’s hot, dry summers and older ranch and Eichler-style construction are the two biggest local cost drivers.
- Free estimates are available at (877) 542-8668, and we quote line by line.
If you want the full picture of what the work involves before you think about dollars, start with our overview of Duct Repair & Sealing in Cupertino.
Duct Repair & Sealing Cost Breakdown (2026)
| Line Item | Typical Price Range | What It Covers |
|---|---|---|
| Single duct repair (reconnect, reseal one joint) | $240 – $420 | Disconnected flex, loose collar, one failed seam |
| Section replacement (flex run or rigid trunk section) | $300 – $550 | Cracked, torn, or crushed duct section swapped out |
| Crushed or collapsed flex run replacement | $180 – $400 per run | Common behind drywall, in attics, under floors |
| Whole-home duct sealing (accessible joints and gaps) | $600 – $1,400 | Sealing supply and return joints throughout the system |
| Mastic sealing per joint | $12 – $28 per joint | Permanent seal at collars, seams, and register boots |
| R-8 insulated duct upgrade (per run) | $200 – $450 per run | Higher insulation value, useful in hot attics |
| Return duct repair | $275 – $700 | Undersized or leaky returns choking airflow |
| Register or boot sealing (per register) | $25 – $60 each | Closing the floor and ceiling leak gaps |
| Diagnostic inspection and airflow test | $0 – $150 | Often waived with the repair, quoted upfront |
Those figures reflect what we actually bill in Cupertino during 2026. What pushes you toward the high end: a house with more than one failed run, ducts buried in tight attic corners, second-story work, or a system that’s been leaking long enough to have pulled in debris and dust. What keeps you near the low end: a single obvious failure, easy attic or crawlspace access, and a system that’s otherwise sound.
One thing we see constantly in Cupertino: a customer calls about a “duct problem” and it turns out the ducts need cleaning before they can even be sealed properly. A leaky joint pulls attic dust and insulation fibers into the air stream. If that’s you, we’ll tell you plainly, and you can read up on air duct cleaning in Cupertino so you’re clear on the sequence before we quote the repair.
What Affects Duct Repair & Sealing Pricing in Cupertino
- Age and style of the housing stock. Cupertino is full of mid-century ranch homes and Eichler-style houses built between the late 1950s and 1970s. Many still have original galvanized or early flex ducting with taped joints that gave up long ago. Taped seams fail. That means more joints to seal than a newer build, and it moves a Cupertino home toward the top of the whole-home range.
- Attic heat and the dry summer swing. Cupertino attics hit 140°F-plus on a July afternoon, and the dry air through the hot season dries out duct tape and mastic until it cracks and peels. It’s one reason we see more failed joints here than in cooler Bay Area pockets. Insulated, properly sealed runs hold up better, and R-8 upgrades cost more up front but survive this climate.
- Access and location of the failure. A duct behind an accessible attic hatch is a quick job. A crushed run buried under a finished floor or boxed into a soffit is a different afternoon. We quote based on what we can reach without damaging your finishes, and we tell you upfront when something needs drywall opened.
- Number of runs and system size. A three-bedroom Cupertino ranch with eight supply runs and seali returns costs less to seal than a larger two-story with fourteen runs and a complicated trunk line. Per-run pricing is why we measure before quoting.
- Flex versus rigid versus original metal. Original galvanized ductwork can usually be sealed and saved. Old, torn flex often needs replacing run by run, and crushed flex is the single most common repair we find. The material choice changes both the labor and the parts.
- Whether cleaning is needed first. Contaminated ducts have to be cleaned before a lasting seal. We bring the equipment for both, so a repair and a clean can be scheduled together, but the numbers are quoted separately so you see exactly what each piece costs.
For a look at how these factors play out across town, our page on air duct cleaning in Sunnyvale covers the neighboring market, and the same housing-era logic applies.
How to Save on Duct Repair & Sealing
You can shave real money off a Cupertino duct job without cutting corners. Here’s what actually moves the number down.
- Fix leaks before they spread. A single failed joint, sealed now, costs a fraction of what a wet, dust-laden run costs once it’s pulled apart the drywall. Waiting is the most expensive thing you can do.
- Bundle sealing with cleaning when both are due. If your ducts need cleaning and sealing, doing them in one visit saves the trip and setup. We quote each service separately so you can see the savings.
- Insist on mastic, not tape. Mastic seals outlast duct tape in Cupertino’s hot attics. Paying slightly more for a permanent seal now avoids paying for the same repair in a few summers.
- Get every quote in writing, line by line. A vague “that’ll be about $800” is how people get surprised. Our free estimate at (877) 542-8668 breaks out parts, labor, and per-run costs so you can compare fairly.
- Ask whether a run can be saved instead of replaced. Sometimes a crushed flex run is really a badly supported one. Properly supported and re-sealed ducting lasts much longer than the stapled-up mess we frequently find.
To see what cleaning costs on its own, our dryer vent cleaning in Cupertino service is a fire-safety job with its own pricing page, and it’s worth a read if your dryer has been running hot.
How we quote
We don’t hand you a fuzzy ballpark and switch it at the door. When we arrive, we inspect the accessible ductwork, check the return system, and confirm exactly which runs are failing. Then you get a written number. The tools we carry aren’t general-purpose: we bring professional-grade Rotobrush and Nikro systems and Abatement Technologies negative-pressure containment so the work is contained and the ducts come out clean. That equipment is part of why the job is done right the first time, not because it’s what every generalist happens to carry. The same systems are what restoration and remediation crews rely on.
FAQs – Duct Repair & Sealing Cost
How much does duct repair cost in Cupertino?
Most Cupertino duct repairs cost between $240 and $650, with a single joint repair or reconnection landing near $240 to $420 and a multiple-run fix or section replacement climbing toward $650. Call (877) 542-8668 for a free, written estimate based on your actual ducts, not a phone guess.
How much does whole-home duct sealing cost in Cupertino?
Whole-home duct sealing in Cupertino runs $600 to $1,400, depending on the number of runs and how accessible the joints are. Homes with original mid-century ductwork tend toward the top because there are simply more leaks to seal. Call us and we’ll give you an exact number after a quick inspection.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper than full replacement: a targeted repair at $240 to $650 versus a full system replacement that runs many times that. Replacement only wins when the ducting is extensively crushed or contaminated beyond saving. We tell you which side of that line you’re on after inspecting, and we never push replacement when a repair will hold.
Can you fix a crushed flex duct the same day?
Often yes. A single crushed flex run replacement is typically $180 to $400 and can frequently be done in one visit when we have access. Larger jobs or multiple failed runs may need a scheduled return. Call (877) 542-8668 and we’ll tell you what’s realistic for your Cupertino home.
Does duct sealing actually lower energy bills enough to pay for itself?
Yes, leaky ducts in Cupertino’s hot attics can lose a significant share of conditioned air before it reaches your rooms, and sealing typically pays back within a few cooling seasons. A $600 to $1,400 sealing job on a system with serious leaks is one of the better ways to cut summer energy use. Get a free estimate and we’ll show you where your system is leaking.
The equipment matters as much as the price. We run a deliberately narrow service menu, air duct cleaning, dryer vent cleaning, and air duct repair, because depth beats a long list of things done halfway. We work with Honeywell and Aprilaire filtration systems and apply Guardsman-level care to your home during service, so the work area is protected. If you’re comparing quotes across Cupertino, make sure each one is sealing with mastic and containing the debris with real negative-pressure equipment.
Want the full service details behind these numbers? Visit our home page for how we approach duct work, or call us at (877) 542-8668 with questions before you commit to anything.
Get Your Free Duct Repair & Sealing Estimate in Cupertino
Every Cupertino home is a little different: a 1962 ranch on a quiet street, a townhome near De Anza, a house where the attic has been baking for years. The only way to give you a real price is to look. Call (877) 542-8668 to schedule a free estimate in Cupertino. We’ll inspect the accessible ductwork, tell you exactly what needs sealing or replacing, and hand you a written quote with no pressure and no runaround. Whether it’s a single failed joint or a whole-home sealing job, you’ll know the number before we pick up a tool.
Pricing reflects the Cupertino market as of 2026. Duct Cleaning Cupertino offers free estimates – call (877) 542-8668.
What Our Customers Say
"Job was done well and the house smells better. There was some dust knocked loose around a couple of the registers that I had to wipe down afterward."
- Divya Patel"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."
- Carmen Salazar"Ran a negative air machine on the whole system rather than the shop vac on a stick that the cheap outfit down the road uses. Showed me the before and after photos from inside the trunk line and it was genuinely disgusting."
- Kelly Barrett