Whole-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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Repair & Sealing Across Dunwoody
Most Dunwoody homes need duct repair and sealing every 2-3 years, not the standard 3-5, because the city’s protected oak-pine canopy dumps pollen directly onto return-air intakes while original 1970s fiberglass duct board crumbles inside the walls. A typical duct sealing job in Dunwoody runs $450-$850 for a single system, with flex duct repair or full duct board replacement reaching $1,200-$2,400 depending on how many branch runs are involved. Call (678) 693-5322 for a written estimate before any work starts.
We dispatch crews to Dunwoody from our Atlanta office, and we know the difference between a 1978 split-level off Tilly Mill Road and a 1985 brick colonial near Dunwoody Village Parkway. That matters because the duct problems are different. The older ranches in Georgetown carry original fiberglass duct board that’s actively delaminating after 45 years of Georgia humidity. The later builds near Dunwoody Club Forest often have first-generation flex duct with failing collars at every plenum connection. Our Duct Repair & Sealing technicians arrive with mastic sealant, mechanical fasteners, and replacement flex in standard diameters so we’re not making a second trip.
Why CleanRun Air Duct Cleaning Cumming Is Dunwoody’s Preferred Duct Repair & Sealing Company
We’ve worked in Dunwoody since 2013, and the photo records from those early jobs look remarkably similar to what we find today: the same duct board delamination, the same pollen loading, the same preventable energy loss from leaky returns. The difference now is that homeowners have seen enough bait-and-switch duct cleaning to ask harder questions. We answer with written prices, camera documentation, and the 365-Day Done Right Promise backed in writing on every job.
Our Dunwoody customers typically find us after a bad experience elsewhere - a $79 coupon that became a $1,800 upsell, or a “cleaning” that left the ducts looking identical. They stay because we show them the inside of every run before we quote and again before we leave. Haven Standard Clause 1 requires a written price before any work starts. No exceptions. No “call for pricing.” The number you agree to is the number on the invoice.
Technicians serving Dunwoody are background-checked and uniformed under Haven Standard Clause 3: Verified Crews. You’ll get a name and photo before arrival, not a random subcontractor in an unmarked van. Scheduling is coordinated from our Atlanta office, with crews running Dunwoody routes weekly.
Our Duct Repair & Sealing Services in Dunwoody
Duct Sealing with Mastic Sealant
Dunwoody’s continuous summer runtime - systems often cycle 18+ hours daily from late May through September - turns every pinhole leak into a major efficiency loss. We seal metal and duct board joints with mastic sealant, a water-based compound that remains flexible after curing, unlike foil tape that dries and separates. In Dunwoody’s humidity, flexibility matters. A typical mastic sealing job for a 1,500-2,500 square foot home runs $450-$750, with larger homes or multiple systems scaling to $900-$1,200. We photograph every sealed joint before the mastic sets.
Flex Duct Repair
The flex duct installed in Dunwoody’s 1980s builds has reached end of life. The plastic collars crack, the inner liner tears at elbows, and the insulation sleeve sags, creating condensation pockets in summer. Our crew carries replacement flex in 6″, 8″, and 10″ diameters from Guardsman and Abatement Technologies, plus mechanical fasteners that exceed code minimums. Flex duct repair in Dunwoody typically costs $180-$340 per run, with whole-system replacement running $1,400-$2,200 for an average home. We don’t patch with tape and hope.
Metal Duct Repair
Some Dunwoody homes, particularly the brick colonials near Dunwoody Village, have galvanized metal trunk lines with spot rust at seams or damage from previous contractor work. We cut and replace damaged sections, seal with mastic, and insulate to prevent condensation. Metal repair is less common here than flex or duct board work, but when it’s needed, the cost runs $320-$580 per section depending on accessibility.
Duct Insulation
Uninsulated or degraded ductwork in Dunwoody’s unconditioned attics loses 20-30% of heating and cooling energy before air reaches the register. Georgia’s summer attic temperatures exceed 140°F, and winter dips below freezing - that delta destroys R-value in old insulation. We install new sleeve insulation or encapsulate failing duct board with closed-cell liner, typically $380-$650 for a single system. Every insulation job includes thermal imaging documentation to verify the fix.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Dunwoody
Our trucks stock parts from Rotobrush, Abatement Technologies, and Guardsman - brands you can look up before we arrive. We don’t show up with hardware-store tape and a shop vac. For Dunwoody’s older housing stock, that means replacement flex duct with proper antimicrobial liners, mastic rated for 200°F continuous exposure, and mechanical fasteners that won’t back out in vibration. Having the right parts on the van matters when you’re working in a Georgetown crawl space and the homeowner needs the system running before dinner. We don’t make return trips for materials we should have carried.
Common Duct Repair & Sealing Problems We See in Dunwoody Homes
- Delaminating duct board in 1970s ranches. The foil-and-fiberglass liner separates from the rigid substrate, creating a debris blower that no filter upgrade can stop. We find this in Georgetown and Dunwoody Club Forest on nearly every pre-1985 home. Encapsulation or replacement is the only fix.
- Pollen-choked return intakes from March through May. Dunwoody’s tree canopy produces oak, pine, and sweet gum pollen loads that overwhelm standard filters and force leaks in flex duct connections. Sealing checks every 2-3 years catch this before blower motors overwork.
- Mold colonization in supply plenums. Continuous summer runtime pulls 70%+ humidity through any gap in sealing, creating ideal conditions for growth at the air handler connection. We find this most often in homes where the original mastic has dried and cracked.
- Collapsed flex duct in attics. Georgia’s attic heat degrades the wire helix in older flex, causing sagging and airflow restriction. The blower works harder, bills climb, and rooms stay uneven. Replacement with properly supported new flex solves it permanently.
Pricing for Duct Repair & Sealing in Dunwoody, GA
| Service | Typical Range in Dunwoody |
|---|---|
| Mastic sealing (single system) | $450 - $850 |
| Flex duct repair (per run) | $180 - $340 |
| Flex duct replacement (whole system) | $1,400 - $2,200 |
| Duct board encapsulation or replacement | $1,200 - $2,400 |
| Duct insulation (single system) | $380 - $650 |
| Metal duct section repair | $320 - $580 |
These ranges reflect Dunwoody’s housing stock - older homes need more extensive work, and the preserved tree canopy means we often find heavier debris loading that must be addressed before sealing. Every quote is written and agreed before work starts, per Haven Standard Clause 1. We also offer a Free Second Opinion on any competitor’s written estimate; bring it in and we’ll put our number next to it.
What drives cost up: multiple systems, crawl space or attic access difficulty, asbestos-containing duct insulation (common in pre-1980 builds), and the need for full duct board replacement versus spot repair. What doesn’t change the price: the neighborhood. Georgetown and Dunwoody Club Forest pay the same rates as newer developments.
We Also Serve Cities Near Dunwoody
Our crews run regular routes to Duct Repair & Sealing in Dunwoody plus Cumming, Buford, Milton, and Suwanee from the Atlanta office. The same written pricing, documented photo records, and 365-Day Done Right Promise apply in every service area. Call (678) 693-5322 to schedule or request a Free Second Opinion.
Serving Dunwoody, GA - Our Local Coverage Area
We’re based in the Dunwoody area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in Dunwoody
Every 2-3 years, not the standard 3-5, because Dunwoody’s protected tree canopy produces heavier pollen loading than neighboring suburbs, and original 1970s duct board is now actively failing. The combination of organic debris and delaminating fiberglass means leaks develop faster and spread more debris. Call (678) 693-5322 to schedule an inspection and we’ll put a written maintenance interval in your job record.
Partial delamination can sometimes be encapsulated with closed-cell liner and sealed with mastic, but full separation of the foil-and-fiberglass layer requires replacement - no sealant can re-adhere loose glass fibers to degraded substrate. In Georgetown, we regularly find duct board that’s beyond encapsulation; we photograph the damage and quote both options in writing before any work starts. The homeowner decides.
Yes, directly. The ordinance-protected oak-pine canopy concentrates pollen over residential return-air intakes, loading filters faster and forcing more unfiltered air through any leak in the duct system. Homes in neighborhoods with thinner tree cover - or those that cleared lots before the ordinance tightened - show measurably less return-side debris. We account for this in our inspection protocol and recommend more frequent sealing checks for homes under heavy canopy.
We start with a camera inspection of every accessible duct run, photograph the findings, and deliver a written scope and price before any repair begins. For sealing jobs, we clean the joints, apply mastic with a brush or trowel depending on access, and photograph the finished work. For repairs, we replace damaged sections with new material, support properly, and verify airflow balance at the registers. You receive the complete photo record as a standard deliverable, not an extra.
Yes, we repair and seal ductwork in detached garages, guest houses, and pool equipment rooms throughout Dunwoody, including the larger lots in Dunwoody Club Forest where outbuildings are common. These systems often have independent flex runs that degrade faster due to temperature extremes and less frequent maintenance. We inspect, quote in writing, and document the same as any primary system. Call (678) 693-5322 to discuss the specific setup.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Cumming, serving Dunwoody since 2013.