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.
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Before
AfterFast, Reliable Duct Repair & Sealing Across Decatur
Duct repair and sealing in Decatur typically runs $280-$680 for most homes, with flex duct replacement and mastic sealing jobs on pre-1960 bungalows landing in the middle of that range. Crews dispatch from our Atlanta office and carry R-8 insulated flex, mastic compound, and metal collar hardware sized for the retrofitted ductwork common in Decatur’s older neighborhoods. Call (678) 679-7540 for a written estimate before any work starts.
We’ve been in enough Decatur crawl spaces to know the pattern. Oakhurst, Winnona Park, College Heights - these neighborhoods are full of craftsman bungalows and colonial revivals built between the 1920s and 1950s, long before central air was imagined. When HVAC arrived decades later, installers dropped flex duct through dirt crawl spaces and punched floor registers through original oak flooring. That retrofit geometry is now sixty years old in many homes. The metal boot collars separate. The flex sags and crushes. Humidity from fifty-plus inches of annual rainfall works into the liner. And because Atlanta’s spring pollen counts rank among the nation’s worst, any gap in the duct system pulls that yellow load straight into bedrooms.
This is why our Duct Repair & Sealing team treats Decatur as a distinct service territory, not a zip code on a broader Atlanta map. The failures we find here are specific to this housing stock, this climate, and this pollen load.
Why CleanRun Air Duct Cleaning Alpharetta Is Decatur’s Preferred Duct Repair & Sealing Company
CleanRun has held the Haven Standard since 2013, and the documented photo record we deliver on every job - inside every duct run, before and after - lets Decatur homeowners verify what was actually found against what they were told. No other company in this market delivers that as standard.
Our technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. The license number is published on this page, not buried in a footer. Every job starts with a written price and ends with a photo record.
Dispatch and scheduling are coordinated from our Atlanta office, but crews serve Decatur locally and carry inventory matched to the flex duct, metal collars, and mastic sealant volumes common in Decatur’s pre-1960 housing stock. We don’t route a van from the suburbs and hope the tech has the right diameter flex on the truck.
The 365-Day Done Right Promise applies in Decatur exactly as it does everywhere we work: if the repair or seal fails, we make it right, backed in writing on every invoice. Not a policy subject to manager approval. A written guarantee.
Our Duct Repair & Sealing Services in Decatur
Duct Sealing
Unsealed plenum joints, trunk connections, and register boots bleed conditioned air into Decatur crawl spaces instead of pushing it through registers. On a 90°F July afternoon with humidity cresting 85%, that means your blower runs continuously while bedrooms stay lukewarm. We seal with mastic compound - a thick, fiber-reinforced paste that remains flexible after curing - applied to every metal-to-metal and metal-to-flex joint. In Decatur’s vented dirt crawl spaces, mastic outperforms foil tape, which degrades in high humidity and loses adhesion within two to three years. A typical duct sealing job in Decatur runs $280-$450 for a single-system home.
Flex Duct Repair
The flex duct dropped through Decatur crawl spaces in the 1970s and 1980s is now brittle, sagging between joists, or crushed where homeowners stored holiday decorations against it. We replace with R-8 insulated flex duct, sized to the original CFM load, supported every four feet to prevent sag, and connected with mechanical collars sealed in mastic. In Winnona Park, we regularly find original flex duct with torn vapor barriers, letting crawl-space moisture condense on the fiberglass insulation inside the liner. That moisture feeds mold that the supply fan then distributes through the house. Flex duct repair in Decatur typically runs $180-$340 per run, depending on crawl-space access and length.
Metal Duct Repair
Some Decatur homes - particularly the 1950s ranch pockets near College Heights - have galvanized steel trunk lines that have rusted through at the seams or separated at the drive cleats. We patch with sheet metal and seal with mastic, or replace short sections with equivalent gauge metal when the rust is structural. Metal repair is less common than flex work in Decatur, but when it’s needed, the fix is permanent if done with proper materials. Metal duct repair in Decatur runs $220-$480 depending on accessibility and extent.
Duct Insulation
Uninsulated or poorly insulated supply ducts in Decatur crawl spaces lose 15-25% of their cooling capacity before the air reaches the register. In summer, that means your 55°F supply air hits the register at 65°F or warmer. We wrap with R-8 insulation where accessible, or replace with pre-insulated flex when the original duct is compromised. Duct insulation work in Decatur typically runs $150-$320 per run, often combined with sealing or repair for a single-system price.
What happens when you call
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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.
Before
AfterTrusted Brands We Service in Decatur
CleanRun carries professional-grade equipment and materials from Honeywell, Aprilaire, and Abatement Technologies - brands that publish specifications customers can verify independently. Our Decatur crews stock mastic sealant, mechanical collars, and R-8 flex duct in diameters from 6 to 14 inches, which covers the retrofit ductwork found in nearly every pre-1960 Decatur home. We don’t order parts after diagnosis. The van arrives with inventory, so repairs that require materials beyond standard sealant don’t trigger a return visit.
Common Duct Repair & Sealing Problems We See in Decatur Homes
- Separated boot collars in Oakhurst and Winnona Park. The original metal floor-register boot, installed when HVAC was retrofitted, pulls away from the flex duct above it. The system runs under negative pressure, so it draws unfiltered crawl-space air - mold spores, soil particulates, rodent debris - directly into bedrooms. Homeowners notice musty smells, elevated allergy symptoms, and dust that returns within days of cleaning. This failure is invisible from inside the house.
- Crushed or sagging flex duct in unventilated crawl spaces. Decatur’s summer humidity, sustained by 50-plus inches of annual rainfall, drives condensation inside duct liners where the vapor barrier is compromised. The fiberglass insulation becomes a mold substrate. The supply fan then distributes spores through every register on that trunk. We find this in roughly half the Decatur crawl spaces we enter.
- Unsealed plenum and trunk joints at the air handler. Conditioned air bleeds into the crawl space instead of reaching registers. The blower motor runs longer, power bills climb, and rooms at the end of the trunk never reach set temperature. In Decatur’s 1940s and 1950s homes, these joints were often sealed with cloth-backed tape that has dried and failed.
- Pollen-loaded returns with filter-bypass gaps. Atlanta’s spring pollen season pushes extraordinary organic loads through any gap in the return ductwork. In Decatur’s older homes with wall-mounted returns in plaster or lath construction, the return boot is often poorly sealed to the wall cavity, meaning the system pulls attic or wall-cavity air instead of filtered return air.
Pricing for Duct Repair & Sealing in Decatur, GA
Here’s what duct repair and sealing costs in Decatur’s market, based on jobs we’ve written prices for since 2013:
| Service | Typical Range in Decatur |
|---|---|
| Duct sealing (mastic, single system) | $280-$450 |
| Flex duct repair / replacement (per run) | $180-$340 |
| Metal duct repair (patch or section) | $220-$480 |
| Duct insulation (per run) | $150-$320 |
| Boot collar reattachment + seal | $140-$220 per register |
| Full system assessment with photo record | Included with any repair |
These are whole-system prices, not per-vent teaser rates that balloon once the truck is on your driveway. We deliver a written price before any work starts, every time, under Haven Standard Clause 1. The price we write is the price you pay. Factors that move a job within these ranges: crawl-space access height, number of compromised runs, and whether the air handler plenum requires resealing.
Bring a competitor’s written estimate. We’ll deliver a free second opinion, our number next to theirs, with no obligation.
We Also Serve Cities Near Decatur
Our crews work Duct Repair & Sealing in Decatur and surrounding communities including Smyrna, Lawrenceville, Snellville, and Marietta. Each territory gets the same documented photo record, written upfront pricing, and 365-Day Done Right Promise.
Serving Decatur, GA - Our Local Coverage Area
We’re based in the Decatur 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 Decatur
Repair and sealing is usually the right call for 1940s Decatur bungalows, provided the metal trunk lines are structurally sound. The flex duct and boot collars installed during HVAC retrofit are the components that fail, not the original house framing. We assess the metal trunk for rust and separation; if it’s intact, we replace compromised flex runs, reattach separated boots with mechanical collars and mastic, and seal all joints. Full replacement of a functional metal trunk is rarely justified on cost or performance grounds. Call (678) 679-7540 and we’ll put a camera through the system to show you what we’re seeing.
Isolated musty smells almost always mean a separated boot collar or compromised flex duct serving only those rooms. In Decatur’s pre-1960 homes with floor registers, the boot collar at the register connection is the weakest point in the supply path. When it separates, that room’s supply air is drawn from the crawl space directly beneath it - mold, soil, rodent debris - while other rooms on the same trunk receive normal conditioned air. The problem is invisible from inside and only discoverable with a crawl-space inspection. We find this pattern regularly in Oakhurst and Winnona Park.
Atlanta’s spring pollen counts are documented by the National Allergy Bureau and consistently rank among the highest in the United States. In Decatur, that pollen loads onto every outdoor surface, including roof-mounted and ground-level HVAC equipment. Any gap in your return ductwork - a poorly sealed filter rack, a separated return boot, a wall cavity acting as a return plenum - pulls that pollen into the system and distributes it through supply registers. The yellow coating on your car in April is the same material entering your ductwork through leaks. Sealing the return side is the fix, not a sales pitch.
Cleaning removes debris from inside intact ductwork. Repair fixes the physical failures that let debris enter. We distinguish them with a camera inspection of every run. If the duct is intact internally but dirty, negative-pressure extraction with HEPA collection is the right service. If the camera shows separated boots, crushed flex, or moisture-damaged liner, cleaning alone is temporary - the failure will recontaminate the duct within weeks. Our documented photo record shows you exactly which condition your system is in before you decide. Call (678) 679-7540 for the inspection.
Full airtightness to modern new-construction standards is rarely achievable in retrofitted 1940s and 1950s ductwork without replacement costs that exceed the value of the fix. The realistic target for Decatur’s older homes is sealing all accessible joints with mastic, replacing compromised flex runs with properly supported R-8 insulated duct, and eliminating the major leak paths - separated boots, unsealed plenum connections, and filter-bypass gaps - that bleed conditioned air and pull in contaminants. We document the before-and-after leakage with visual inspection and deliver the photo record as proof of what was sealed. The 365-Day Done Right Promise covers any seal failure.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Alpharetta, serving Decatur since 2013.