Fast, Reliable Duct Repair & Sealing Across Dunwoody
Duct repair and sealing in Dunwoody typically costs $280-$650 for most residential jobs, with same-day service available throughout the 30346 area and surrounding neighborhoods. We arrive from our Atlanta office within 45 minutes to an hour for calls placed before 3 PM, and we complete most repairs in a single visit so you’re not scheduling a second day off work.
We’ve been driving Dunwoody’s winding, tree-canopied streets since 1984, and we know the houses here. The split-levels off North Peachtree, the traditional two-stories near Georgetown, the ranch homes tucked back along Vermack Road - they share a common problem. Original flex-duct systems installed in the 1970s, 80s, and 90s are reaching the end of their service life. The fiberglass ductwork running through hot attics has dried out, cracked at the joints, or pulled loose from its collars. Meanwhile, Dunwoody’s extraordinary tree canopy, the densest in metro Atlanta, delivers pollen loads that pack return-air plenums until airflow is strangled. Homeowners call us thinking they need a new HVAC unit. Often, they need Duct Repair & Sealing instead. Call (855) 305-5564 for a free estimate.
Why Bellows Air Duct & Vent Co. of Atlanta Is Dunwoody’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Dunwoody on showing up when we say and leaving systems that don’t need us back. Our 90-Day Done Right Promise is stamped on every job: if the work isn’t right, we return at no charge, no paperwork, no arguing. That promise has kept us in business for over 42 years.
Our Dunwoody customers tend to be longtime homeowners, the kind who’ve lived in the same house for twenty or thirty years and plan to stay. They’ve learned to be wary of low-bid contractors who change the price at the door or disappear when something fails. We answer to a different standard. Every technician is background-checked and uniformed. Every job is camera-inspected before and after, so you see what we see. And every price is disclosed upfront, before a single tool is lifted - the number on the phone is the number on the invoice.
Calls to our office are answered by a live person, 24 hours a day. Not a voicemail tree, not an app. If your ducts have separated in July and your upstairs is running ten degrees hot, you talk to someone who can dispatch help.
Our Duct Repair & Sealing Services in Dunwoody
Duct Sealing
Leaky ducts steal 20 to 30 percent of conditioned air before it reaches your rooms. In Dunwoody’s older homes, we find leaks concentrated at flex-duct collars, plenum connections, and where ductwork passes through unconditioned attic spaces. Our sealing process starts with a camera inspection to map every breach, followed by mechanical fastening and professional-grade mastic application. We don’t use tape as a primary sealant - in Dunwoody’s humid climate, tape fails within a year. Mastic cures to a flexible, permanent bond that withstands Georgia’s summer attic heat and winter temperature swings.
Flex Duct Repair
Flex duct is the dominant material in Dunwoody’s 1970s-1990s housing stock, and it’s now 30 to 50 years old. We’ve replaced crushed, torn, and heat-brittled flex runs in subdivisions throughout the city, from the older neighborhoods near Dunwoody Village to the homes lining Chamblee-Dunwoody Road. Our repairs use insulated, reinforced flex duct sized to your system’s CFM requirements, with proper support strapping to prevent sagging. A sagging flex duct creates a low point where condensation pools - in Dunwoody’s humidity, that’s where mold starts.
Metal Duct Repair
Some Dunwoody homes, particularly custom builds from the late 1980s and 1990s, use galvanized steel trunk lines with flex-duct branches. We repair separated seams, rusted sections, and failed dampers. Metal ductwork requires different techniques: sheet-metal screws, fiberglass mesh reinforcement, and high-temperature mastic rated for the temperature differentials in unconditioned attic spaces. We stock the fittings and transition pieces that match older systems, so we’re not ordering parts and making you wait.
Duct Insulation
Uninsulated or degraded duct insulation in a Dunwoody attic is a problem year-round. In July, attic temperatures reach 130 degrees or more. Uninsulated ducts lose cooling capacity before the air reaches your vents. In January, the same ducts bleed heat. We install foil-faced fiberglass insulation with proper vapor barriers, sealed at all seams, to maintain your system’s designed efficiency. For homes near Dunwoody’s heavily wooded sections, where summer humidity stays elevated even overnight, proper insulation also reduces condensation risk at duct joints.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Dunwoody
We repair and seal ductwork connected to HVAC systems from every major manufacturer, and we specify professional-grade materials that serious contractors demand. Our trucks carry mastic sealants and repair supplies from Nikro and Abatement Technologies, the same brands specified by commercial HVAC contractors for durability in high-humidity environments. For air quality components integrated with sealed duct systems, we install Honeywell and Aprilaire media filters and UV sanitizers where appropriate. We stock common flex-duct diameters, metal transition fittings, and insulation wraps locally, so most Dunwoody repairs don’t wait on parts. If your system uses a less common configuration, we’ll tell you before we start and give you a firm timeline.
Common Duct Repair & Sealing Problems We See in Dunwoody Homes
- Pollen-packed return plenums. Dunwoody’s oak, pine, and sweet gum canopy generates pollen counts among the highest in the nation. Over decades, that pollen packs into return-air plenums until airflow is visibly restricted. Homeowners blame the HVAC unit for poor performance. The real bottleneck is a plenum box that hasn’t been opened since the Carter administration. We clean before we seal.
- Aging flex-duct joints in hot attics. Dunwoody’s original flex-duct systems were designed for 25 to 30 years of service. They’re now 30 to 50 years old. The fiberglass jackets have degraded, the wire helixes have rusted, and the taped joints have dried and failed. Conditioned air leaks into attic spaces, and the system runs longer to compensate.
- Improper prior repairs with tape instead of mastic. We’ve opened Dunwoody duct systems where a previous service used duct tape or foil tape as the primary sealant. In humid attic conditions, the adhesive fails, the tape peels, and leaks return within months. Mastic is the only permanent solution for residential duct sealing in Georgia’s climate.
- Condensation and mold at flex-duct low points. When flex duct sags between supports, it creates a valley where condensation collects. Dunwoody’s summer humidity - combined with cool conditioned air inside the duct - produces persistent moisture. We see mold colonization at these points, particularly in homes with original ductwork routed through unconditioned attic spaces.
Pricing for Duct Repair & Sealing in Dunwoody, GA
We’re straightforward about numbers because we’ve seen what bait-and-switch pricing does to homeowners who’ve already been burned once.
| Service | Typical Range in Dunwoody |
|---|---|
| Duct sealing (whole system, mastic) | $280 - $450 |
| Flex duct repair (single run, up to 25 ft) | $180 - $320 |
| Flex duct replacement (single run) | $240 - $400 |
| Metal duct repair (seam sealing, patch) | $200 - $350 |
| Return plenum cleaning + sealing | $320 - $550 |
| Duct insulation (per linear foot) | $8 - $14 |
| Full system inspection with camera | $89 (credited toward repair) |
What moves a job toward the higher end: multiple duct runs needing replacement, extensive plenum cleaning before sealing can begin, difficult attic access, or mold remediation requirements. What keeps it lower: localized leaks, accessible work areas, and systems where we can seal without full disassembly. We inspect with a camera first, show you what we find, and give you a single price before we start. Our $50 Off Any Repair Over $250 applies to most duct sealing jobs. Seniors and veterans receive a permanent 5% discount. Call (855) 305-5564 for an exact quote - estimates are free.
We Also Serve Cities Near Dunwoody
Our technicians live and work throughout north metro Atlanta, and we regularly route to Duct Repair & Sealing in Dunwoody from jobs in Sandy Springs, Chamblee, Doraville, and Brookhaven. If you’re in one of these neighboring cities and your home shares Dunwoody’s profile - 1970s-1990s construction, mature tree canopy, original flex-duct systems - you’re facing the same challenges we solve here. We offer the same upfront pricing, same camera verification, and same 90-Day Done Right Promise across our entire service area.
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
Yes, restricted airflow from selected vents is more often a duct problem than equipment failure in Dunwoody’s older homes. We regularly find that pollen-packed return plenums or separated flex-duct joints are the real cause of weak airflow, not the HVAC unit itself. A camera inspection will show you exactly where the blockage or leak is located. Call (855) 305-5564 to schedule - our $89 inspection is credited toward any repair.
Professional-grade mastic is the only sealant we use for permanent duct sealing in Dunwoody. Duct tape and foil tape fail within 6 to 12 months in Georgia’s humidity. Mastic remains flexible and bonded through years of temperature cycling and moisture exposure. We apply it with a brush or trowel, reinforced with fiberglass mesh at stress points, and we verify the seal with a post-repair camera inspection.
Most duct sealing and repair jobs near Vermack Road and the surrounding Dunwoody subdivisions are completed in 3 to 5 hours. Jobs requiring extensive plenum cleaning due to pollen buildup, or multiple flex-duct replacements, may extend to a full day. We give you a specific time estimate after our camera inspection, and we finish in a single visit in nearly every case. Our technicians arrive with stocked trucks, so we’re not leaving for parts.
Yes, duct sealing is worth doing before any HVAC replacement. A new system connected to leaky ducts cannot deliver its rated efficiency, and you’ll pay for equipment performance you never receive. In Dunwoody’s market, sealed ducts can improve system efficiency by 20 to 30 percent, which means your replacement unit can be properly sized rather than oversized to compensate for losses. We offer a Free Second Opinion on Any Written Estimate if another contractor has recommended replacement without addressing duct condition.
We specify high-temperature mastic rated for continuous exposure to 200 degrees Fahrenheit, well above peak attic temperatures even in Dunwoody’s hottest summers. The greater risk to sealant longevity is improper surface preparation - dust, oil, or moisture left on the duct before application. Our pre-seal cleaning protocol, followed by camera verification, ensures the mastic bonds to bare metal or fiberglass as specified. We’ve warrantied our sealing work for 90 days with full confidence, and we stand behind it beyond that period.
We’re ready when you are. Call Bellows Air Duct & Vent Co. of Atlanta at (855) 305-5564 for a free estimate on duct repair and sealing in Dunwoody. We’ll inspect with a camera, show you exactly what we find, and give you one honest price before we start. Done right, and backed in writing for 90 days.
Written by Cliff Darden, Owner at Bellows Air Duct & Vent Co. of Atlanta, serving Dunwoody since 1984.