Whole-home duct cleaning
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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.
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AfterHow Much Does Duct Repair & Sealing Cost in Alpharetta?
Duct repair and sealing in Alpharetta typically costs between $285 and $1,150, with most homes falling in the $450 to $700 range. Minor sealing jobs running under two hours sit on the low end, while full-system sealing with mastic and multiple access points pushes toward the top. We write every price down before work starts, so the number you’re quoted is the number you pay.
This guide breaks down exactly where your money goes, what drives the price up or down in the Alpharetta market, and what you should expect from a crew that does the work right the first time. If you’d rather talk to a person than read a pricing guide, call (762) 769-7145 and we’ll walk you through it.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what duct repair and sealing costs look like across Alpharetta in 2026. These are real ranges based on the homes we work in from Crabapple to Milton’s edge to Windward, not national averages that ignore what Atlanta humidity does to ductwork.
| Service | Typical Alpharetta Price Range | What It Includes |
|---|---|---|
| Minor duct sealing (1-2 small leaks) | $285 – $450 | Access panel work, mastic sealing, foil tape on small gaps, air test |
| Moderate sealing (multiple leaks, short runs) | $450 – $700 | 3-5 seal points, mastic application, boot-to-drywall sealing, pressure check |
| Full-system duct sealing | $700 – $1,150 | All accessible ducts, return and supply plenums, mastic and tape, post-seal airflow verification |
| Duct repair (replacing a damaged section) | $350 – $800 | Removing compromised flex or sheet metal, installing new section, sealing connections |
| Plenum repair or replacement | $400 – $900 | Supply or return plenum work, mastic sealing, insulation where needed |
| Diagnostic visit (if repair isn’t straightforward) | $89 – $149 | Inspection, leak testing, written findings |
Here’s what moves the number around. A single leak behind a vent boot in a hallway near Kimball Bridge Road is a quick fix. A crawlspace or attic with three separate runs showing separation at the collars is a different job entirely. Alpharetta’s older neighborhoods, especially the 1980s and 1990s builds around Sable Creek and Jamestown, tend to have more joint separation because the original duct tape and thin mastic have simply aged out. Newer construction, where code required better sealing at the rough-in stage, usually needs less work.
Access is the big variable on labor. If your ductwork runs through a finished basement ceiling or a tight attic with a steep pitch, the technician works slower and more carefully. That’s the right way to do it, but it costs more than an open garage or unfinished basement where everything is reachable from a ladder.
What Affects Duct Repair & Sealing Pricing in Alpharetta
- Access to the ductwork. An unfinished basement or open crawlspace makes for a straightforward job. Finished ceilings, spray-foamed attics, and tight vertical chases mean the tech has to cut access panels or work around obstructions, and that adds labor hours.
- Number of leaks and location of separation points. Leaks cluster at connections: boots, collars, plenum attachments, and where flex line meets sheet metal. A house with 14 registers may only have 3 problem points, or it may have 10. We find out during the inspection and price it accordingly.
- Material type. Flex duct (common in Alpharetta homes built after 1990) is often less expensive to repair than rigid sheet metal, which requires more fabrication and more careful sealing.
- Age of the system. Twenty-year-old ductwork in a Windward or Country Club of the South home often has multiple issues simultaneously. Sometimes the smarter financial move is to replace a run rather than patch it repeatedly, and we’ll tell you when repair stops making sense.
- Whether the blower and returns need attention. If a return is undersized or the plenum is leaking significantly, sealing only the supply side won’t fix the whole problem. We check both sides and price the complete scope, not just what’s easiest to reach.
- Time of year. HVAC season in North Fulton runs hard from May through September. Scheduling during the shoulder months, like October through March, gives you more flexibility, though our written pricing stays the same regardless of season.
How Much Do Common Duct Problems Cost to Fix in Alpharetta?
Most homeowners don’t call saying “my ductwork needs sealing.” They call because something specific is wrong. Here are the problems we see most often in Alpharetta homes and what they typically cost to resolve.
Leaky Duct Boots and Vents
A duct boot is the metal or plastic connector that joins your duct to the floor or wall register. Over time, these loosen where they meet the drywall and conditioned air leaks into the wall cavity instead of the room. Sealing a boot costs $85 to $200 per boot depending on access, and it’s one of the highest-return fixes in terms of comfort, because the air you’re paying to heat and cool actually reaches the room.
Disconnected or Separated Duct Joints
When a flex duct pulls away from a metal collar, or a sheet-metal section separates at a seam, you’re blowing air into the attic or crawlspace. A single reconnection and seal runs $150 to $300. If multiple runs have separated, which we see often after years of thermal expansion in hot Georgia attics, the price scales per joint but drops per-unit since we’re already on site.
Crushed or Torn Flex Duct
Flex duct gets crushed when boxes pile on top of it in the attic or when animals in the crawlspace damage it. A torn or severely kinked run sometimes can’t be restored and needs replacement. Replacing a typical 10- to 15-foot flex run runs $200 to $450 installed and sealed, depending on the diameter and how far the tech has to crawl to get to it.
Leaking Supply Plenum
The supply plenum is the box that sits on top of your furnace or air handler, distributing air throughout the runs. Plenum leaks are high-volume leaks, and sealing them with mastic runs $300 to $600. If the plenum needs partial rebuilding, expect $600 to $900.
Ductwork in Crawlspaces and Slab Foundations
Alpharetta has thousands of homes on slabs and with crawlspaces, especially in older neighborhoods like the ones around downtown and along Rucker Road. Ductwork in these spaces fights moisture, which means insulation gets waterlogged, straps rust, and connections loosen. Crawlspace work adds $50 to $150 per job in labor because it’s slower, dirtier, and often requires a second person for safety and material handling.
Duct Repair vs. Duct Replacement: Which Makes Sense in 2026?
When repair estimates climb past a certain point, replacement becomes the smarter spend. Here’s how we guide the decision for Alpharetta homeowners.
If your ducts are less than 15 years old and the damage is localized, repair and sealing almost always wins. You’re looking at $285 to $1,150 to fix specific issues versus $4,000 to $8,000 for a complete duct replacement in a typical Alpharetta home.
But if you’re dealing with ductwork that’s 20-plus years old and leaking in eight or ten places, the math flips. Replacing and properly sealing a full system starts around $4,000 and goes up from there, but it resets the clock and gets you R-8 insulated flex or sealed sheet metal throughout. Full replacement also gives us the opportunity to correct poor original layouts, which matters in Alpharetta houses where additions were built without resizing the ductwork.
The rule we apply is simple: if repair cost exceeds 40 to 50 percent of replacement cost, and the system is older than 15 years, replacement is usually the better money. We’ll show you both numbers in writing and let you decide without any pressure.
Call (762) 769-7145 and we’ll do a full inspection and give you both prices on the spot.
How to Save on Duct Repair & Sealing
- Fix multiple issues in one visit. The trip charge and inspection time get spread across more work. If you know about two problems, tell us about both before we arrive so we bring the right materials and can get everything done same-day.
- Handle it before peak season. Our pricing doesn’t change with the calendar, but scheduling in the cooler months means more flexible appointment windows and often faster turnaround, which matters if you’re coordinating with other home projects.
- Address small leaks before they become big ones. A boot separation left alone for a year pulls more dust into the system and strains your blower. The fix is $150 today; it can double or triple if the run gets damaged as a result.
- Ask for a written quote that itemizes the work. You should never pay for vague line items. Our quotes list every leak, every material, and every hour of labor before you sign anything. That protects your budget and prevents door-stop surprises.
- Check whether your utility company offers rebates. Some Georgia Power and Sawnee EMC residential programs have offered credits for duct sealing in certain years. We’ll help you check eligibility before the work starts.
- Keep the old system running while it still makes sense. If your HVAC unit itself is near the end of its life, it might be smarter to time the duct replacement with the equipment replacement. You save on labor because the work happens together. We can tell you honestly where your system stands, even if that means telling you to wait.
Why Choose Hollis Air Duct Alpharetta for Duct Repair & Sealing
Our Alpharetta duct repair and sealing work runs on The Garrison Standard, which sounds formal and is. It means the price we write down before we start is the price you pay when we leave. It means a background-checked, uniformed technician shows up inside the quoted window and treats your home the way a disciplined tradesperson should. And it means every job carries the 365-Day Done Right Promise in writing: if the repair fails within a full year, we come back and make it right at no charge. Free second visit included, not negotiated.
Roy Castellanos leads our team here in Alpharetta. He’s been in the air duct trade since the early 2000s and built his reputation the old-fashioned way: showing up on time, pricing work honestly, and leaving the jobsite cleaner than he found it. That’s the kind of accountability you should expect from anyone touching the air you breathe inside your home.
Our home is your home’s air. We’re part of the Garrison Partners family, in business since 2004, and we use professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, and filtration brands including Honeywell, Aprilaire, and Guardsman. The tools matter because they determine whether the job actually fixes the leak or just covers it up for a season. We prefer to fix it.
What to Expect During a Duct Repair & Sealing Job
When you call (762) 769-7145, a live person answers. There’s no voicemail loop and no waiting until Monday. We’ll schedule a window that works for you, and the technician arrives in that window, uniformed and ready.
Here’s how the job goes:
- Walkthrough and inspection. We look at your ductwork where it’s accessible: attic, crawlspace, basement, or wherever it runs. We check boots, collars, plenum connections, and flex runs. We listen to the system and note any pressure issues.
- Written price. Before any work starts, you get a line-item quote: what’s leaking, what we’ll do about it, what materials go into the job, and what it costs. You approve it. Then we work.
- Sealing and repair. We use mastic, not duct tape. Mastic is a thick, paint-on sealant that’s rated for HVAC systems and doesn’t dry out or peel like the gray tape you see at hardware stores. It’s the industry standard for a reason.
- Verification. After sealing, we check the repaired areas and do a pressure or airflow verification so you know the work moved the needle. We don’t just spread sealant and leave; we confirm the system is moving air the way it should.
- Cleanup and written report. The jobsite is clean when we leave. You get a summary of what was done and what we found, plus the 365-Day Done Right Promise in writing.
If the problem ever comes back within a year, Roy Castellanos and his crew return free of charge. That’s the promise, in writing, on every job we do. Read more about our full Duct Repair & Sealing in Alpharetta service.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Alpharetta?
Duct sealing in Alpharetta costs between $285 and $1,150 in 2026. The majority of homes we seal fall between $450 and $700. A few isolated leaks at vent boots sit at the bottom of the range; full-system sealing with plenum work and multiple access points sits at the top. Call (762) 769-7145 for an exact quote, written before we start any work.
Is it cheaper to repair or replace ductwork in Alpharetta?
Repair is almost always cheaper than replacement when the ductwork is under 15 years old. Repairs average $285 to $1,150, while a full replacement in a typical Alpharetta home starts around $4,000 and can run past $8,000 depending on the system size and home layout. The replacement conversation only makes sense when the system is old, leaking in many places, or poorly designed to begin with. We’ll show you both numbers and let the math do the talking.
Does duct sealing actually save money on energy bills?
Yes. The U.S. Department of Energy has long estimated that duct systems lose 20 to 30 percent of conditioned air through leaks, holes, and poorly connected joints. Sealing those leaks means your HVAC system doesn’t have to run as long to hit the thermostat setpoint. In Alpharetta’s July heat, when the air conditioner runs hardest, the savings compound quickly. The exact payback depends on how badly your system was leaking before, which our inspection will document.
Can you fix my ducts the same day?
In most cases, yes. Small-to-moderate leaks can be sealed same-day. Larger jobs, including multiple runs or plenum work, may take a second visit. Call (762) 769-7145 and a live person will confirm availability and what to expect for your specific situation.
What’s the difference between duct tape and the mastic you use?
Duct tape fails. It dries out in attic heat, loses its adhesion, and peels away within a few years. Mastic is a water-based sealant designed specifically for HVAC work. It goes on thick, cures to a durable seal, and stays flexible through Georgia’s temperature swings. That’s why every professional duct sealing job uses mastic on joints and connections, and that’s what we put on every repair we do in Alpharetta.
Do you charge for estimates?
No. Estimates are free. We inspect, we document what’s wrong, and we give you a written price before any work begins. You don’t pay a dime until you approve the work.
Get Your Duct Repair & Sealing Price in Alpharetta
You don’t have to guess what duct repair will cost. Call (762) 769-7145 and we’ll give you a written price for your exact situation, based on an inspection of your home’s ductwork. No pressure, no price that changes at the door, and no work you didn’t approve in advance. Roy Castellanos and the Hollis Air Duct Alpharetta crew are ready when you are.
Written by Roy Castellanos, Owner at Hollis Air Duct Alpharetta, serving Alpharetta since 2004. Pricing reflects the Alpharetta market as of 2026. Hollis Air Duct Alpharetta offers free estimates – call (762) 769-7145.
What Our Customers Say
"Duct sealing along with the cleaning cut our summer bill. Straight talk and fair price."
- Gwen O."Good job on the ducts. Ran about an hour over the estimate, though they told me early. Air smells cleaner."
- Mike E."They checked each section with a camera and showed me the dust before and after. Thorough and honest."
- Nicole H.