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
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After
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AfterHow Much Does Duct Repair & Sealing Cost in North Charleston?
Duct repair and sealing in North Charleston typically runs $350 to $1,200 for most homes, with straightforward seal jobs landing near the low end and larger repair-and-seal projects climbing toward the top. A single disconnected joint or torn flex run often falls in the $180 to $450 range. Whole-system sealing that includes a full inspection, mastic or aerosol sealing, and post-work verification generally runs $900 to $2,400 depending on the size and layout of the ductwork. These are estimated ranges for the North Charleston market in 2026; the written estimate sets the final price.
Every job is priced per project after we inspect the system, and the estimate is free. Our technicians have up to 8 years of experience, and we use professional-grade equipment from Rotobrush and Nikro rather than consumer-grade vacuums. Call (855) 683-7582 to book an assessment. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Key Takeaways
- Most North Charleston duct repair and sealing jobs fall between $350 and $1,200.
- Small spot repairs and single-run replacements start around $180.
- Full-system sealing with verification can reach $2,400.
- Leaky ducts waste conditioned air and pull attic dust and insulation fibers into living spaces, which matters in North Charleston’s hot, humid summers and mild winters.
- We clean, repair, and seal – one call covers the whole system, and estimates are free.
If you’re starting from scratch on indoor air quality, learn about our full Sunstone Air Duct Cleaning services before you book a repair visit.
Duct Repair & Sealing Cost Breakdown (2026)
Pricing on ductwork is driven by access, square footage of the home, and how much of the system has failed. The table below shows typical North Charleston ranges for the most common line items. Treat each figure as an estimate – the written estimate after inspection is what actually applies.
| Line Item | Typical Cost Range |
|---|---|
| Duct inspection and leak assessment | $0 – $150 (often included with a repair booking) |
| Sealing a single disconnected joint or boot | $180 – $350 |
| Replacing a torn flex duct run | $250 – $600 |
| Repairing crushed or sagging rigid duct | $350 – $900 |
| Mastic sealing of accessible joints | $400 – $850 |
| Whole-system aerosol sealing | $900 – $2,400 |
| Full repair + cleaning + sealing package | $1,100 – $2,800 |
| Post-work pressure or airflow verification | $150 – $300 |
The biggest cost driver is how much of the system has failed, not how big the house is. A 1,400-square-foot ranch with good attic access and one bad boot can be sealed for less than a 2,200-square-foot two-story with a maze of flex runs tucked behind soffits. Attic and crawlspace conditions matter here too. North Charleston’s humid summers mean ductwork in unconditioned attics takes a beating – condensation on cold metal duct, deteriorating tape and mastic, and flex runs that sag under the weight of summer heat all push repair costs up. Homes in the historic Park Circle neighborhood often have retrofitted duct systems that were run through older framing, which takes longer to inspect and repair than newer construction in the Wando or Ingleside areas.
Cleaning is usually paired with repair when the ducts themselves are contaminated with debris, insulation dust, or post-renovation grit. If your ducts are dirty as well as leaking, a combined visit is more efficient than two separate calls. You can read more about that pairing on a North Charleston page.
What Affects Duct Repair & Sealing Pricing in North Charleston
Several local and structural factors move the price of a duct project up or down. These are the ones we see most often in North Charleston homes:
- Attic and crawlspace access. North Charleston’s climate means ductwork often runs through unconditioned attic space or a vented crawlspace. Tight access adds labor hours, and hard-to-reach runs can double the time on a job.
- Type of duct material. Flexible duct is cheaper to replace than rigid sheet metal or older ductboard, but flexible runs are also more prone to crush and sag. Older homes in the Olde North Charleston area may have original ductboard systems that need more careful repair.
- Number of failed connections. A home with 15 leaking joints costs more to seal than one with three. Aerosol sealing spreads the labor across the whole system efficiently, but only when the leaks are in accessible, sealable places.
- Humidity and condensation damage. In North Charleston’s damp summers, cold duct surfaces in warm attics sweat. That moisture degrades tape, mastic, and flexible duct insulation faster than in drier markets. Long-term leak problems often trace back to this condensation pattern, not failing parts.
- Whether cleaning is needed at the same time. Sealing a contaminated system traps debris inside. Best practice is to clean before sealing, and a combined visit adds cleaning cost but saves a second trip.
- Airflow verification. Post-work testing confirms the seal actually held. It’s an add-on cost, but it’s how you know the money went into the right place.
- Home age and HVAC retrofit history. Retrofitted systems in older homes often have mismatched duct sizes and improvised connections. Those take longer to correct.
How to Save on Duct Repair & Sealing
Duct repair isn’t a place to shop purely on price. A cheap seal job that skips inspection and doesn’t fix underlying leaks will leave you paying again next season. Still, there are real ways to keep the cost reasonable:
- Get the repair and cleaning done in one visit. A combined quote usually costs less than two separate service calls, and you avoid paying twice for access and setup.
- Address leaks before they spread. A single disconnected joint runs $180 to $350 to fix. Ignored, that leak wets surrounding insulation, and repairs can climb past $900. Early repair is the cheapest route.
- Ask for a written estimate with line items. It lets you see what’s driving the price and decide whether to do the whole job now or stage it. Our estimate is free, so there’s no cost to finding out.
- Time it with an HVAC or air quality service. If you already have a technician in the attic, having duct repair done at the same time reduces setup labor. If you use Honeywell or Aprilaire systems, ask for a contractor familiar with them – we work with both.
- Get the ducts cleaned first if they’re heavily soiled. Sealing dirty ducts can trap debris. Cleaning first means the seal holds and you don’t pay to redo it.
- Ask about airflow verification. A small investment in testing after the job confirms the seal is right and avoids a return visit.
Call (855) 683-7582 for a free estimate. We’ll tell you what’s actually wrong with the system and what the fix will run – no pressure, no surprise fees.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in North Charleston?
Duct sealing in North Charleston typically runs $400 to $850 for accessible joints and $900 to $2,400 for whole-system aerosol sealing. The exact price depends on the number of leaks, attic access, and whether cleaning is included. Call (855) 683-7582 for an exact quote – estimates are free.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper when the duct structure itself is sound. A torn flex run costs $250 to $600 to replace, while a full duct replacement typically runs several times that. Replacement only makes sense when duct is crushed, wet, or failing across most of the system. Our inspection will tell you which it is. Call (855) 683-7582 to book one.
Can duct leaks make my energy bill higher in North Charleston?
Yes. Leaky ducts in a North Charleston attic lose cooled air into unconditioned space during summer, so the system runs longer to hold the thermostat. Sealing tightens the system and reduces that waste. Typical sealing jobs here cost $400 to $2,400 depending on scope. Call (855) 683-7582 for a free estimate before the next hot season.
How much does it cost to fix one disconnected duct?
A single disconnected joint or boot typically costs $180 to $350 to reconnect and seal. If the flex run itself is torn or crushed, replacement pushes that to $250 to $600. It’s one of the lower-cost repairs we see, and fixing it early prevents bigger problems. Call (855) 683-7582 for a free estimate.
Why is my ductwork leaking in my North Charleston home?
Leaks in North Charleston homes usually come from failed tape or mastic, sagging flexible duct, or condensation damage from humid summers. Attic heat and moisture degrade seals faster here than in drier climates. A duct repair visit costs $350 to $1,200 typically and includes sealing the failed points. Call (855) 683-7582 for a free estimate.
Do I need duct cleaning before sealing?
Yes, if the ducts are dirty. Sealing a contaminated system traps debris inside, and you end up paying twice. A combined cleaning and sealing visit is the correct order and usually saves money over two trips. We use Rotobrush rotary-brush cleaning and Nikro HEPA extraction, so debris is captured rather than blown into your home. Call (855) 683-7582 to schedule.
What happens when you call?
We answer 24/7. A call outside dispatch hours is booked into the next opening, Sunday through Friday, 7am to 7pm. During dispatch windows, we can often arrange same-day service. Same-day is one of the reasons people call us, and the estimate is free either way.
Which equipment do you use for duct repair and sealing?
We use professional-grade equipment: Rotobrush rotary-brush cleaning systems, Nikro HEPA-filtered extraction, and Abatement Technologies filtration units for homes with mold concerns or post-renovation dust. Sealing is done with mastic or aerosol methods chosen for the duct type. We also service Honeywell and Aprilaire air quality systems. Call (855) 683-7582 to discuss your setup.
Contact Sunstone for a Free Duct Repair & Sealing Estimate in North Charleston
Leaking ducts cost you two ways: wasted energy and worse air inside your home. If your system has failing joints, sagging flex runs, or visible condensation in the attic, get it inspected before the summer heat pushes the problem further. We clean, repair, and seal – and we use the same equipment trusted by professional remediation crews, not improvised tools. Our technicians have up to 8 years of experience, and every estimate is free.
Call (855) 683-7582. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. We’re closed Saturday. The estimate is free, and the written quote you receive is what the final price will be.
Pricing reflects the North Charleston market as of 2026. Sunstone Air Duct Cleaning offers free estimates – call (855) 683-7582.
Written by the team at Sunstone Air Duct Cleaning.
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."
- Devon Jackson"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."
- Paul Lawson"Told me straight that our ducts were in decent shape and didn't need doing every year like the mailer companies claim."
- Neil Thompson