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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.
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AfterHow Much Does Duct Repair & Sealing Cost in San Diego?
Duct repair and sealing in San Diego typically costs between $450 and $1,900 for most homes, with the average job landing around $950. Simple repairs like patching a disconnected section or sealing a single accessible joint run on the lower end, while full-system sealing with mastic and Aeroseal-type application across a 2,000+ square-foot home pushes toward the top. The good news for San Diego homeowners is that our coastal climate means less corrosion than humid or freezing regions, which often keeps repair scope smaller than what you’d see in, say, Houston or Minneapolis.
We’re Kestrel Air Duct San Diego. We’ve been fixing and sealing ducts under the Kingswell Guarantee since 2004, and every job starts with a written price in your hands before we touch a single vent. If you want a specific number for your home, call (619) 695-0424 and we’ll walk you through what we see, what it costs, and what we recommend.
Key Takeaways
- Most San Diego homes pay $450 – $1,900 for duct repair and sealing, with $950 as the common midpoint.
- Small, localized repairs (one disconnected register boot, a short flex-duct replacement) often run $250 – $600.
- Whole-home duct sealing with mastic and professional application runs $800 – $1,900 depending on square footage and access.
- Scoping and access matter more than anything else in San Diego; crawl spaces and attics in older homes (pre-1990) push labor up.
- Kestrel Air Duct San Diego gives you a written price before work begins and backs the work with the 365-Day Done Right Promise.
Duct Repair & Sealing Cost Breakdown (2026)
| Service | Typical San Diego Price Range | Notes |
|---|---|---|
| Inspection and diagnostic (visual + basic airflow test) | $75 – $150 | Often waived or credited if you proceed with repair. |
| Single register boot re-connection | $180 – $350 | Common when a boot separates from the floor or wall box. |
| Short flex-duct replacement (up to 10 ft) | $220 – $450 | Includes new duct, connectors, and sealing at both ends. |
| Patch and seal small holes or cracked sections | $200 – $400 | Mastic or foil tape application, access included. |
| Seal accessible duct joints (per major junction) | $80 – $140 | Mastic-over-fiberglass-mesh sealing at plenums and branch connections. |
| Seal entire duct system (typical 1,500 – 2,500 sq ft home) | $800 – $1,900 | Includes plenum, supply/return trunks, and branch connections. |
| Aeroseal-type injection sealing (per full system) | $1,200 – $2,500 | Best for ducts with widespread leaks in hard-to-reach places. |
| Replace section of rigid metal ducting (per 10 ft) | $350 – $650 | Cost rises if drywall or flooring must be opened for access. |
These are real numbers we’ve seen on hundreds of San Diego jobs. The single biggest variable is access. If your ducts run through a low crawl space in Clairemont or a tight attic in North Park, labor goes up because the technician works in confined conditions and the sealing takes longer to apply correctly.
What Affects Duct Repair & Sealing Pricing in San Diego
- Access to the ductwork. Homes built on slabs in areas like Mira Mesa and Poway often have ducts in tight attics or under-floor chases. If we can reach the duct without cutting into walls or ceilings, you save hundreds. If not, the labor time grows.
- Age and material of the existing ducts. Pre-1990 homes in neighborhoods like Normal Heights and Ocean Beach often have older flex duct with degraded inner liners, or rigid duct that’s started to separate at the seams. Old material sometimes costs less to replace fully than to patch repeatedly.
- Number of leaks and their location. A single failed connection at a return plenum runs under $300. Ten leaking branch joints scattered across a 2,400-square-foot system runs well over $1,000 because each one needs to be located, prepped, and sealed individually.
- Scope of sealing: spot vs. whole-system. Spot sealing addresses the specific joints you can see and feel leaking. Whole-system sealing treats every accessible connection, the return and supply plenums, and all branch takeoffs. Whole-system costs more per job but costs less per connection and greatly improves system efficiency.
- Whether we need to open walls or ceilings. In some San Diego homes, a duct runs inside a soffit or a framed floor chase. If a leak sits in a concealed section, we’ll give you a clear written price for the access work before anything gets cut. This is exactly the kind of job where the written-in-advance price matters.
- Post-sealing verification testing. Some homeowners want a before-and-after duct leakage test to document how much airflow was being lost. The test adds $150 – $300, but it gives you a hard number to compare. We include the option in every estimate, never bury it.
How to Save on Duct Repair & Sealing
Start with a focused inspection rather than a sealed-system estimate. If your only complaint is a weak airflow in one room, the fix may be a single disconnected boot that costs a few hundred dollars to re-attach and seal. When you call Kestrel Air Duct San Diego at (619) 695-0424, we’ll ask the right questions to figure out whether you need a spot repair or a whole-home sealing job before we ever schedule a visit.
Second, address sealing at the same time as any other duct work. If you’re already having a section of flex duct replaced, sealing the adjacent joints while we’re in there adds only a little labor to the job and prevents a second trip charge later.
Third, don’t wait until the ducts have failed badly enough to cause secondary damage. A disconnected return duct in a dusty San Diego attic doesn’t just lose conditioned air; it pulls in attic dust, and over months that dust settles into your evaporator coil and shortens the life of your HVAC system. What costs $400 today may cost $2,000 if the leaking duct forces an early AC repair or replacement next year.
We offer free estimates. The number we quote is the number you pay, written down before the work starts. That’s not a special we run; it’s the Kingswell Guarantee standard since 2004. Call (619) 695-0424 and ask for Dale Whitmore or any of our team.
Is Duct Sealing Worth It in San Diego’s Climate?
Answer: yes, and the payoff shows up in three places. First, the average San Diego home loses 15% to 25% of its conditioned air through duct leaks, according to research from the California Energy Commission. That means your air conditioner runs longer to cool the same space. Sealing the system can cut that loss to under 5%. Second, a sealed duct system helps balance temperatures between rooms. Third, sealing improves indoor air quality by reducing attic dust and crawl-space particles pulled into the airstream.
California’s climate is mild compared to most of the country, so the dollar savings from sealing may not be as dramatic as they are in Phoenix or Dallas. But the comfort improvement is real, and in a state where energy costs keep climbing, stopping the loss makes sense.
Why Duct Repair Shouldn’t Wait: What We See in San Diego Attics
In the 20 years since we started under the Kingswell Guarantee, we’ve pulled thousands of feet of collapsed flex duct out of San Diego attics. The story is consistent: a rat or squirrel got in, chewed through the outer liner and a foot of inner core, and the system spent months blowing conditioned air into the attic instead of the living room. The homeowner noticed higher power bills and a stuffy upstairs, but didn’t know why.
Other common failures we see in the San Diego market include:
- Separated duct joints at the plenum. The metal collar slips or the tape fails, and a gap opens where the branch connects to the main trunk.
- Crushed flex duct. After a roof repair or solar installation, workers sometimes compress a duct run, cutting airflow by half or more.
- Boot separation at the floor or wall register. The boot is the sheet-metal fitting that connects the duct to the register you see in the room. When the connection fails, the system blows conditioned air into the wall cavity or under the floor.
- Disconnected return ducts. Especially in older homes where return air runs through panned joist spaces. A single bay that opens to the attic can pull 90-degree attic air into the return stream.
How We Seal Ducts: The Trade Words, Explained
When you talk to any duct company in San Diego, you’ll hear a few terms. Here’s what they mean and how we do the work.
Brush agitation. If we’re cleaning as part of a repair call, we run a Rotobrush rotary brush system through the duct. Rotating bristles knock dust and debris off the duct wall. That’s the agitation. Plain English: it scrubs the inside of the duct so debris can be pulled out rather than left to break loose later.
Negative-pressure extraction. While the brush works, a Nikro negative-pressure unit pulls air backward through the duct system. This is what carries dislodged debris out of your home and into the unit’s containment. Plain English: it’s a powerful vacuum connected to the duct system, keeping dust from being pushed into the rooms during the work.
HEPA filtration. Our Abatement Technologies units use HEPA filters to trap particles pulled out of the ducts. Plain English: the particles leave the duct and go into the filter, not into your living room air.
Mastic sealing. Mastic is a paste-like sealant applied over the joints and seams of ductwork with a brush. It dries into a flexible, airtight covering. Plain English: we paint a thick sealant over the cracks and joints so air can’t leak out.
Aeroseal-type injection. This method pumps a fog of sealant into the ductwork under pressure. The sealant particles stick to the edges of leaks and build up until the hole is sealed. Plain English: the leaks are filled from the inside, which works well when the outside of the ducts is impossible to reach.
Duct Sealing and Your Home’s Air Quality
A leaking return duct in San Diego usually pulls air from unconditioned spaces like the attic, the crawl space, or the space between floors. That air carries whatever happens to be there: dust, insulation fibers, rodent droppings, humidity, and in dry months, fine particulate that makes allergies worse. A leaking supply duct pushes the air you paid to condition right back out into those spaces, carrying rooms’ stale air with it.
Sealing stops both directions. We recommend sealing first, then cleaning if needed. If you clean before sealing, the leaks just pull the same contaminants back into the system within months. The order matters, and we’ll be straight with you about which order makes sense for your home.
For homeowners who want to deepen the air-quality benefit, Kestrel Air Duct San Diego stocks filtration products from Honeywell, Aprilaire, and Guardsman. These are replacement media and IAQ products only; we’ll recommend them when they’re appropriate and not a moment before.
What the 365-Day Done Right Promise Covers
Every Kestrel job comes with a written guarantee: the 365-Day Done Right Promise. If the repair or seal fails within 365 days, we return and make it right at no charge. Not a partial credit. Not a diagnostic fee. We return, fix it, and leave.
Here’s what you need to know: the promise is in writing on every single work order, not offered as a verbal assurance. If you think a repair failed, call us. We’ll schedule a return visit at a time that works for you. We’ll inspect the original work, confirm what failed, and redo it. If we’re at fault, you pay nothing. No negotiating, no fine print.
That’s the Kingswell Guarantee, and it applies to every visit from the first minute. Founded in 2004, the Kingswell family of companies has built its reputation on four pillars: a written price before work begins, a defined arrival window, a clean job site, and a written guarantee on the work. That hasn’t changed in 20 years.
How We Price Without Surprises
Dale Whitmore and our team price the same way on every call. We list the work line by line: every repair, every section of replacement, every sealing application, every access opening. You get that written price before we begin. If we find something unexpected mid-job that changes the scope, we stop, explain it, and get your written approval before proceeding. We never hand you a larger invoice at the door and call it a “change order.”
That’s the core difference between Kestrel Air Duct San Diego and a contractor who gives a low ball-park over the phone and revises it on the driveway. We operate under The Kingswell Way, a code of conduct that governs every visit: say the price, show up within the window we gave, leave the place cleaner than we found it, put the guarantee in writing, and come back if it fails. It’s a small list, but it’s a list we don’t break.
Questions to Ask Any Duct Repair Company in San Diego
Before you hire anyone for duct repair or sealing, ask these questions. A good company answers without hesitation.
- Do I get a written price before work starts? If the answer is anything but yes, hang up.
- What exactly is included in the price? You want line items, not a single lump sum with no detail.
- What’s the guarantee, in writing? A one-year written guarantee is a reasonable minimum. Kestrel’s 365-Day Done Right Promise meets that and stands behind it.
- Who’s doing the work? We send background-checked, uniformed technicians, not a subcontractor we’ve never met.
- Will you test the system before and after? A leakage test isn’t always necessary, but the company should be able to offer one and explain what the numbers mean.
- What happens if a repair fails? Our answer: you call, we return, we fix it. No fees. That’s in writing.
FAQs – Duct Repair & Sealing Cost
How much does duct repair cost in San Diego?
Most San Diego duct repairs cost between $250 and $600 for localized issues like a disconnected register boot, a short flex-duct replacement, or a sealed joint at a plenum. Larger repairs, like replacing several sections of damaged duct or opening walls to reach concealed leaks, run from $600 to $1,900 or more. Call (619) 695-0424 for a written estimate specific to your home; estimates are free.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper when the duct material is sound; if more than about half of the system is degraded, replacement may beat repeated repairs. In San Diego, a full duct replacement for a 2,000-square-foot home typically runs $3,000 to $7,000, while repair and sealing usually sits between $450 and $1,900. The math favors replacement when you’ve already paid for multiple spot fixes and leaks keep appearing.
How much does Aeroseal duct sealing cost in San Diego?
Aeroseal-type injection sealing for a whole San Diego home typically costs $1,200 to $2,500. The price varies based on the number of leaks, system size, and how much of the ductwork is accessible. It’s most cost-effective when the ducts have widespread small leaks in concealed spaces.
Can you repair ducts the same day in San Diego?
In most cases, yes. A simple boot re-connection or flex-duct replacement can often be done same-day if we have the parts on the truck, which we usually do. Larger sealing jobs may require a return visit or two. Call (619) 695-0424 in the morning and we’ll tell you whether we can get to you that day.
Does duct sealing really save money on energy bills in San Diego?
Yes, though the savings are more visible in cooling season. The California Energy Commission estimates ducts lose 15% to 25% of conditioned air through leaks. Sealing can cut that leakage to under 5%, which means your AC works less and your monthly SDG&E bill drops by 10% to 20% in many homes. The exact dollar figure depends on your system, but the savings are real and ongoing.
What does the 365-Day Done Right Promise actually cover?
If any duct repair or sealing we perform fails within 365 days, Kestrel Air Duct San Diego returns and makes it right at no charge. The promise is written on every work order. You call us, we schedule the return, and we fix it. There’s no deductible, no trip charge, and no argument.
Call Kestrel Air Duct San Diego for a Free Estimate
If you’ve got a room that never cools, a power bill that climbs every summer, or dust accumulating in the vents, the fix may be a sealed duct system. Call Kestrel Air Duct San Diego at (619) 695-0424 for a free estimate. We’ll send a background-checked, uniformed technician, give you the written price before any work begins, and back the repair with the 365-Day Done Right Promise.
We answer the phone with a live person, 24/7. No voicemail queue, no automated system. A real conversation, any time. Call us and ask for Dale Whitmore. We’ll tell you honestly what your ducts need, what it costs, and what we’d do if it were our house.
Pricing reflects the San Diego market as of 2026. Kestrel Air Duct San Diego offers free estimates – call (619) 695-0424.
Written by Dale Whitmore, Owner at Kestrel Air Duct San Diego, serving San Diego since 2004.
What Our Customers Say
"Thorough job and the price was exactly what they quoted. Took a little longer than they estimated, about an extra hour, but they didn't rush and they cleaned up after. No dust left on the floor."
- Nina Castellano"Set up an appointment for the whole house plus the dryer line. They called the morning of to confirm, showed up in the window, and showed me pictures of the gunk they pulled out. Worth it."
- Terrence Boyd"My wife's allergies were awful every morning. Had the ducts done and it's made a real difference. Tech was on time and wore booties in the house without me asking."
- Rob Pendergast