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 Stamford?
Duct repair and sealing in Stamford typically runs $350 to $2,400, with most single-family homes landing somewhere between $650 and $1,400. Small fixes like re-taping a few disconnected joints sit at the low end, while replacing crushed flex runs or sealing a whole distribution system from the duct opening to the main trunk line pushes toward the top. The written estimate sets the final price, and we do those estimates free.
That range surprises some homeowners, mostly because ductwork is invisible until it fails. A loose joint behind drywall in a 1960s North Stamford colonial is a different job from a collapsed run in a newer townhouse near Harbor Point. We clean ductwork and we repair it, which means one visit can find the problem and fix it rather than handing you a referral and walking away.
Key takeaways
- Most Stamford duct repair jobs fall between $650 and $1,400.
- Air sealing alone is usually the cheapest fix and often the biggest airflow gain.
- Crushed or disconnected flex duct is the most common failure we find in older Stamford homes.
- Our technicians use Rotobrush and Nikro systems and have up to 14 years of experience.
- Estimates are free. Call (855) 268-4131. We answer 24/7.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the work breaks down by line item for the Stamford market. These are typical ranges based on job scope, not a menu of fixed prices.
| Service | Typical cost range | What it covers |
|---|---|---|
| Air sealing at accessible joints | $350 – $700 | Mastic and foil-tape sealing at boots, plenums, and exposed connections |
| Whole-system sealing (mastic + tape) | $700 – $1,400 | Sealing from the duct opening to the main trunk line, including accessible runs |
| Flex duct replacement (per run) | $180 – $400 | Removing crushed or torn flex and installing new insulated run |
| Rigid duct section repair | $300 – $800 | Patching or replacing damaged sheet metal, reconnecting collars |
| Disconnected joint reconnection | $150 – $350 | Re-seating and sealing a joint that has separated |
| Duct cleaning before repair | $300 – $700 | Rotobrush or Nikro cleaning so sealing adheres to a clean surface |
| Insulation wrap on exposed runs | $200 – $600 | Re-insulating runs in unconditioned space (attic, crawlspace, rim joist) |
| Register and boot sealing | $75 – $200 each | Sealing the gap between the floor or wall boot and the duct |
What pushes a job toward the higher end? Access, mostly. Ducts buried under blown-in attic insulation, sheet metal wrapped tight against joists, or runs behind finished ceilings all take longer to reach and seal properly. Homes with a single central return and a long trunk line often need more sealing than a compact layout, simply because there’s more surface area to work with. Duct material matters too: older rigid galvanized duct holds up well to repair, while flex duct that has collapsed or torn gets replaced rather than patched, since a patch on a crushed run doesn’t restore airflow.
Cleaning before sealing is another variable. Mastic and foil tape won’t hold on a dirty surface. If we find heavy dust, debris, or evidence of pest activity inside the duct, cleaning with our Rotobrush or Nikro equipment comes first, and that adds to the total. We’d rather tell you that up front than seal over a mess.
What Affects Duct Repair & Sealing Pricing in Stamford
- House age and duct style. Stamford has a wide spread of housing stock. Mid-century homes in neighborhoods like Glenbrook and Springdale often have original rigid duct with joints that have worked loose over decades, which is repairable. Newer construction near the waterfront and downtown frequently uses flex duct, which tends to fail by crushing or tearing rather than loosening.
- Access to the duct run. Attic runs, crawlspace runs, and ducts buried under insulation all add labor. A run you can reach from an open basement is a straightforward job; one that requires moving stored items and cutting an access panel is not.
- How much of the system is affected. A single disconnected joint is a small job. A system with five or six leaks between the air handler and the farthest register takes longer and costs more. Sealing from the duct opening to the main trunk line covers far more ground than spot-sealing one boot.
- Contamination or moisture. When we find mold-like growth, standing moisture, or heavy debris, containment matters. Our Abatement Technologies equipment allows for HEPA-level negative-air containment while we work, which adds time and setup to the job but protects the rest of the house.
- Whether cleaning is needed first. Sealing over a dirty duct doesn’t hold. If cleaning is part of the job, expect it to add cost. It also means the repair lasts longer, since clean surfaces accept mastic and tape properly.
- Air-quality upgrades added on. Some homeowners use the repair visit to add filtration or humidity control. We supply and install Honeywell and Aprilaire products, so a repair can extend into a whole-home air-quality improvement without a second contractor. That’s optional and priced separately.
How Duct Repair & Sealing Works in a Stamford Home
Most jobs follow a similar path. We start by checking airflow at the registers and looking for the usual suspects: disconnected joints, crushed flex, torn insulation, gaps at the boot where the duct meets the floor or wall. A pressure check helps confirm how leaky the system actually is rather than guessing.
Then we seal. Accessible joints get mastic and foil tape, which hold up far better than the gray fabric tape many builders used years ago and which tends to dry out and peel. Registers and boots get sealed at the gap. Where duct runs through unconditioned space like an attic or crawlspace, we re-insulate exposed sections so the conditioned air actually arrives at the room still conditioned.
If we find damaged duct, we fix it on the same visit where possible. That’s the difference between a duct cleaner and a duct repair company. We clean it. If we find damage, we fix it. Most stand-alone cleaning companies stop at the vacuum and hand you a phone number for someone else.
For Stamford homeowners dealing with musty odors or reduced airflow, the repair and the cleaning usually go together. If you’ve just renovated, moved in, or noticed a room that never heats or cools properly, a look at the ductwork is worth the time. You can read more about our full approach on the Duct Cleaning Stamford page.
How to Save on Duct Repair & Sealing
A few practical ways to keep the cost down without cutting corners on the repair itself:
- Combine cleaning and repair in one visit. Two separate appointments cost more in labor than one. If you know the ducts need cleaning and you suspect leaks, ask for both to be scoped together.
- Fix small leaks before they spread. A disconnected joint that’s been blowing conditioned air into an attic for a season often means the surrounding insulation is saturated and the duct has sagged. Caught early, it’s a $150 to $350 job.
- Clear access before we arrive. Moving stored boxes out of the way of attic and crawlspace access saves time, and time is labor.
- Ask for a written scope. A free estimate tells you exactly which runs get sealed and which get replaced. That way you’re not paying for work you don’t need, and you can compare apples to apples if you’re gathering quotes.
- Get the estimate in writing. Prices on this page are typical ranges. The written estimate sets the final price, so ask for one. Call (855) 268-4131 for a free estimate. We answer 24/7.
Repair or Replace? How to Decide
If most of the duct system is original, intact, and accessible, repair and sealing is usually the better move. The cost lands in the hundreds to low four figures for most Stamford homes, and the airflow improvement is immediate. Whole-system duct replacement runs considerably more and often isn’t necessary if the duct is structurally sound.
Replacement makes more sense when duct is collapsed across multiple runs, heavily contaminated beyond cleaning, or installed in a way that can’t be sealed properly because it’s inaccessible. In those cases we’ll tell you plainly. We’d rather recommend the right scope than sell a repair that won’t hold.
Why Professional Equipment Matters for Duct Work
Not every duct problem can be seen. A crushed flex run behind drywall or a separated joint inside a chase shows up as weak airflow at one register, not as anything visible. Finding it takes more than a flashlight and a shop vac.
We use Rotobrush and Nikro duct cleaning systems, the professional-grade equipment HVAC contractors and restoration crews rely on. When a job involves mold-like contamination or post-renovation debris, Abatement Technologies negative-air and HEPA-level containment keeps the work zone contained. And because we carry Guardsman products for cleaning and treatment, we’re not improvising with off-brand chemicals.
The repair side is where that equipment pays off. Most duct cleaning companies clean and leave. We diagnose and repair, so a leak that’s been quietly costing you on every energy bill gets sealed rather than documented in a report. For homeowners in Stamford, that means one contractor for cleaning, repair, and air-quality upgrades rather than three.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Stamford?
Duct sealing in Stamford typically costs $350 to $1,400, depending on how many joints are accessible and how much of the system needs sealing. Whole-system sealing from the duct opening to the main trunk line sits at the higher end. Call (855) 268-4131 for a free estimate – estimates are free.
Is it cheaper to repair or replace ductwork?
Repair is usually cheaper. Sealing and repairing typical problems in a Stamford home runs $350 to $2,400, while full duct replacement costs considerably more and is only warranted when duct is collapsed or heavily contaminated across multiple runs. We’ll tell you which applies to your system.
How much does it cost to replace a crushed flex duct run?
Replacing one crushed flex run typically costs $180 to $400, including the new insulated duct and reconnection. Multiple runs push the total up proportionally, and hard-to-reach runs cost more in labor.
Can you come today?
Most duct repair and sealing jobs can be scheduled for the same day, subject to availability. Call (855) 268-4131. We answer 24/7, and fast dispatch runs 7am to 7pm, Sunday through Friday. A call outside those dispatch hours gets booked into the next opening.
Does duct cleaning cost extra if I’m also getting a repair?
Duct cleaning is a separate line item, typically $300 to $700 at the going rate in Stamford, but combining it with a repair in one visit usually costs less than booking two separate appointments. Sealing holds better on a clean surface, so the two often go together.
If you’re hearing whistling at a register, seeing weak airflow in one room, or wondering whether your attic run is dumping conditioned air into the insulation, the cheapest next step is an estimate. We’ll look at the system and tell you what’s actually needed. Call (855) 268-4131 for a free estimate. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday, and we’re closed Saturday.
Pricing reflects the Stamford market as of 2026. Duct Cleaning Stamford offers free estimates – call (855) 268-4131.
Written by the team at Duct Cleaning Stamford.
What Our Customers Say
"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."
- Amanda Brooks"Did the dryer vent while they were here for a small add on price. The dryer now finishes a load in one cycle instead of two."
- Jeff Ackerman"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."
- Mark Walsh