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 Modesto?
Duct repair and sealing in Modesto typically costs $350 to $1,500 for most homes, with simple sealed-joint and reconnect jobs landing near the bottom of that range and full trunk-line rebuilds pushing toward the top. A single small leak with mastic and tape usually runs $150 to $400. Whole-house aerosol sealing, measured by duct leakage testing before and after, generally falls between $1,200 and $2,500 depending on the size of the system.
Those numbers reflect the Modesto market in 2026: valley labor rates, single-story crawlspace and attic layouts, and the fact that most homes here run forced-air systems long and hard through hot summers. Your written estimate sets the final price, and the estimate is free.
Key Takeaways
- Most duct repair and sealing jobs in Modesto land between $350 and $1,500.
- Leak testing before and after is what proves the work actually did something.
- Attic ducts in Modesto take a beating from summer heat; that’s a common source of failures.
- Repair is usually far cheaper than replacement unless the ductwork is crushed or saturated.
- Free estimates, upfront pricing, and same-day service are available. Call (866) 256-3971. We answer 24/7.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the pricing breaks out by job type in Modesto. These are typical estimates, not exact quotes. Any two homes with the same square footage can differ once we’re in the attic or under the floor looking at the actual ductwork.
| Job | Typical Cost Range | What It Covers |
|---|---|---|
| Sealing a few accessible leaks (mastic + mesh tape) | $150 – $400 | Sealing joints, seams, and small holes on duct runs you can reach |
| Reconnecting a detached duct or register boot | $200 – $450 | Re-securing duct to boot or plenum, sealing the connection, testing airflow |
| Replacing a section of flex duct | $300 – $700 | New flex run, insulated, properly supported and sealed at both ends |
| Trunk line repair or partial rebuild | $600 – $1,500 | Sheet metal or duct board repair on the main trunk, sealing the whole run |
| Whole-house duct sealing (manual application) | $800 – $1,800 | Sealing every accessible joint throughout the system, plus airflow verification |
| Aerosol sealing with before/after leak testing | $1,200 – $2,500 | Pressurized sealant injected through the system, verified with a duct blaster test |
| Full duct replacement (whole system) | $3,000 – $7,000+ | New ductwork throughout, sized to the system, only when repair won’t hold |
| Duct leakage test only | $250 – $500 | Duct blaster measurement of how much air the system is losing |
What pushes a Modesto job up or down: accessible ductwork in an open attic keeps labor low. Ductwork buried under blown insulation, snaked through tight crawlspaces, or wrapped in failing asbestos-era insulation pushes it up because every foot takes longer to reach and seal correctly. Repairing one run is quick; tracking down leaks across a whole system is the bulk of the bill. If your ducts are crushed, sagging, or full of disconnected joints from an old installation, you’re looking at repair on multiple sides of the range, or replacement in the worst cases.
What Affects Duct Repair & Sealing Pricing in Modesto
- Where the ducts run. Modesto homes are a mix of slab-on-grade with attic ductwork and older construction with crawlspace runs. Open attic ductwork is the fastest to reach and seal. Crawlspace ductwork under a low clearance adds time to every connection.
- How many leaks you actually have. A single disconnected boot is one line item. A system with leaks at every joint costs more because sealing happens foot by foot. A duct blaster test tells you which one you’re dealing with before you commit.
- Duct material. Flex duct fails at the joints and connections. Older sheet metal and duct board fail at seams and rust out at the seams. Sealing sheet metal duct properly takes mastic and mesh tape with real attention to each seam; flex duct is faster but often needs replacement sections rather than patches.
- Summer attic heat. Modesto summers push attic temperatures well above outdoor air, and that’s hard on duct insulation and on the connections that hold runs together. Attic ductwork that’s been baking for years often needs insulation wrap as part of the repair, not just a patch.
- Insulation condition. Ducts with torn or compressed insulation lose more air and get sealed twice: once at the duct, once around it. Re-wrapping a run usually adds to the repair cost but keeps the sealing from being wasted.
- System size and complexity. More registers, more runs, more joints. A single-story, one-system home sits at the low end. A two-story home with a zoned system and ductwork in two attics lands higher.
If you want a better picture of what’s going on before you commit to repair, the team at duct cleaning modesto can run a leak test and walk you through the findings. Repair only makes sense after a cleaning pass on a heavily soiled system, so the two often get scheduled together.
How to Save on Duct Repair & Sealing
There’s no way around the labor, but there are real ways to keep the number down.
- Get a leak test first. A $250 to $500 duct blaster test tells you exactly how much air you’re losing and where, so you can repair only what needs it. Skipping the test and guessing leads to paying for repairs that don’t fix the problem.
- Combine cleaning and repair on one visit. If your ducts are both dirty and leaky, cleaning first and then sealing in the same appointment avoids a second trip and a second set of set-up costs. We schedule it as one job with one estimate.
- Fix small leaks before they turn into big ones. A disconnected boot at $200 to $450 today can turn into a failed trunk line at $600 to $1,500 if it’s ignored long enough. The lower-cost repair is the one that happens early.
- Ask about insulation wrap while access is open. Re-wrapping a duct run costs more up front, but ductwork with intact insulation l
What Our Customers Say
"My wife's allergies had been bad in this house since we moved in. It's been two months since they did the ducts and it's noticeably better. Not a miracle, but real."
- Michael Kowalski"They photographed every return and supply before starting and sent me the file afterward. No upsell to a sanitizing treatment I didn't need."
- Carlos Torres"Two guys, about three hours, plastic down at every register, and they wiped the vent covers before putting them back."
- Cedric Mosley