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 Miami?
Duct repair and sealing in Miami, FL typically costs between $450 and $2,800 for most homes, with the average job landing around $1,100 to $1,600. Simple repairs like patching a disconnected duct boot or sealing a few accessible joints run $200 to $600, while full-system sealing with Aeroseal technology or major duct replacement in a larger home can push past $3,000. Kestrel Air Duct Miami gives every customer a written price before any work starts, so the number you’re quoted is the number you pay.
Miami’s climate makes duct sealing more than a comfort upgrade. Humidity seeps into every gap in your ductwork, and when conditioned air leaks into a hot attic, your AC works harder and your electric bill climbs. We regularly see 20 to 30 percent air loss in Miami homes where ductwork was installed in the 1990s or earlier. The fix isn’t a mystery, but the price depends on how much of the system needs attention.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what we’re seeing across Miami, from Kendall to Coral Gables to Aventura. These are real ranges from jobs our technicians have priced this year, not national averages pulled from a database. Use them to budget, then call us for a binding written quote.
| Service | Typical Price Range (Miami, 2026) | What It Includes |
|---|---|---|
| Duct Inspection & Diagnostic | $99 – $250 | Camera or visual inspection to locate leaks, disconnects, and damage; written findings |
| Isolated Leak Sealing (mastic + tape) | $200 – $600 | Sealing accessible joints and small gaps at boots, plenum connections, and visible runs |
| Duct Boot Repair or Reconnect | $250 – $500 per boot | Refastening a disconnected supply or return boot where it meets the floor or ceiling |
| Whole-System Sealing (accessible ducts) | $800 – $1,800 | Sealing all reachable supply and return plenums, joints, and branch connections with mastic |
| Aeroseal Duct Sealing (from inside) | $1,500 – $3,500 | Pressurized aerosol sealing that reaches ducts inside walls and slabs; ideal for inaccessible runs |
| Partial Duct Replacement | $600 – $1,500 per section | Removing and replacing crushed, mold-contaminated, or rodent-damaged duct sections |
| Full Duct Replacement (average Miami home) | $3,000 – $7,500 | Complete removal and new installation of supply and return ductwork across the home |
What drives a job to the top or bottom of those ranges? The answer usually comes down to three things: how much of the ductwork you can physically reach, whether the system is in an attic or buried in a concrete slab, and how many years the existing ducts have been failing. Miami slab homes from the 1950s through 1970s are a special case. When ducts run through the foundation, reaching them often means cutting access points. That’s where Aeroseal becomes cost-effective: sealing from the inside costs less than tearing up floors.
Our home page has more context on how we approach every job, including the written-price commitment we’ve operated under since 2004. For a full rundown of what repair and sealing actually involves, see our Duct Repair & Sealing in Miami page.
What Affects Duct Repair & Sealing Pricing in Miami
Every home is different, and so is every duct system. These are the factors that move your price most in the Miami market.
- Attic access and crawl space conditions. Miami attics run hot, sometimes 130°F by mid-afternoon. Technicians need to work in shorter intervals, and the heat makes mastic cure differently than in cooler climates. If your attic is tight, with low clearance and blown-in insulation covering the ducts, the labor time extends and the price rises.
- Duct location: attic, interior chase, or slab. Ducts routed through interior walls and closets are usually the easiest to reach. Attic ducts are next. Slab-embedded ductwork is the most expensive to address because access is the entire battle. Many pre-1980 Miami homes fall into this category.
- Number of supply and return runs. A 1,200-square-foot condo in Brickell might have 6 to 8 runs. A 3,500-square-foot house in Pinecrest might have 18 to 22. More runs means more joints, more boots, more time, more material.
- Age and condition of the existing ductwork. Ducts installed before 1985 in Miami often used fiberglass duct board, which breaks down in humidity. If our technicians find crumbling duct board or ducts saturated with condensation-fed mold, sealing alone won’t solve it. Replacement becomes the honest recommendation, and that changes the price bracket entirely.
- Accessibility of the air handler. The connection where the plenum meets the air handler is the single most common leak point we find. If your air handler is in a tight closet or the duct connection is behind a water heater, the repair takes longer than an open attic installation.
- Previous repairs and band-aid fixes. Miami’s humidity degrades standard duct tape within a few years. We frequently open up systems where a previous company used the wrong tape, and it’s now peeling away from the duct surface. Removing failed repairs and redoing them correctly adds labor the customer shouldn’t have had to pay for twice.
One local factor people overlook: Miami-Dade building codes require that ductwork be properly supported and insulated to specific R-values when sections are replaced. We follow those codes on every repair. A low-ball bid that skips code compliance isn’t saving you money; it’s creating a re-do.
Is Duct Repair Worth the Cost in Miami?
If you’re losing 20 to 30 percent of your conditioned air into the attic, the math works out fast. A typical Miami household spends $1,800 to $2,600 a year on cooling. Plugging a 25 percent leak is worth roughly $450 to $650 annually in recovered efficiency, before you factor in the comfort difference. Most whole-system sealing jobs pay for themselves in energy savings within two to four years in Miami’s climate, where the AC runs hard from May through October.
Beyond the money, sealed ducts mean fewer hot rooms, less dust blowing through the house, and a system that isn’t pulling attic humidity into your living space every time the blower kicks on. That humidity matters. It’s the difference between a bedroom that feels fine and one that smells musty by August.
How to Save on Duct Repair & Sealing
Saving money on duct work isn’t about finding the cheapest bid. It’s about avoiding wasted work and catching problems before they compound. Here’s what actually helps.
- Get a diagnostic before you agree to sealing. If a company quotes a full-system seal without looking at the ducts, walk away. A proper inspection tells you whether you need three joints sealed or thirty. We charge a fair rate to inspect and document what we find, and that information belongs to you either way.
- Ask what sealant is being used. Water-based mastic is the industry standard for accessible ducts. It lasts decades in Miami’s heat. Cheaper jobs use foil tape or, worse, duct tape, which Miami humidity destroys. Ask the technician to name the sealant and show you the container.
- Combine sealing with cleaning if the system is dirty. If your ducts haven’t been cleaned in years, sealing over accumulated dust and debris just locks it in place. Cleaning first means the sealant bonds to the duct wall itself, not to a layer of dirt that will eventually release. Our air duct cleaning uses Rotobrush rotary brush systems, which agitate debris off the duct walls, paired with Nikro negative-pressure units that pull the loosened material out rather than letting it drift into the house.
- Don’t wait on a small leak. A disconnected boot in one room forces the system to pull air from wherever it can. That’s often a hot attic or a damp crawl space. The longer it runs unbalanced, the more strain on the blower motor. A $300 repair today prevents a $900 motor replacement next year.
- Use the free estimate for the arithmetic, not just the number. Our written estimate tells you exactly what’s included, what materials we’ll use, and how long the job takes. Call (850) 779-9240 and you’ll get a real conversation with a real person, any hour, not a voicemail tree. The estimate costs you nothing, and you’ll have a written number to compare against anyone else.
What Does the 365-Day Done Right Promise Cover?
The Kingswell Guarantee isn’t a slogan on a website. It’s the specific code every Kestrel technician follows, named for the kestrel falcon that hangs steady in moving air. Here’s exactly what it means on a duct repair or sealing job in Miami.
Before any work starts, you get the price in writing. Not a range, not a “we’ll see when we get in there.” The actual number. If the job takes longer than we estimated, that’s our problem, not an add-on to your invoice. We show up in the window we gave you, and if we can’t make it, we call you before the window closes, not after.
When the work is done, we leave the site cleaner than we found it. Your floors get covered; the work area gets vacuumed; debris leaves with us in our truck. Then the guarantee goes in writing too. If the repair or seal fails within 365 days, we come back at no charge. That’s not a courtesy. It’s a term.
To invoke it, call us. Describe the issue. We schedule a return visit and make it right. There’s no claim form, no arbitration, no runaround. The Kingswell Way has worked that way since 2004, and it’s why the company is still handling re-dos that no other shop would honor on paper.
Duct Repair vs. Replacement: How to Know Which You Need
The pricing table above shows two very different brackets: sealing and repairs on one end, replacement on the other. Here’s how we tell them apart in Miami homes.
Seal when the ducts are structurally sound but leaking. That means the duct walls are intact, the insulation is dry, and the problem is at the seams, boots, and plenum connections. Most houses less than 25 years old fall into this category. The fix is straightforward: clean the surface, apply mastic to every accessible joint, and test the system pressure before and after.
Replace when the duct material itself has failed. In Miami, we see three consistent causes. First, humidity-saturated fiberglass duct board that’s turned spongy and begun shedding particles into the airstream. Second, ducts torn by rodents, which are a constant fact of life in South Florida attics and crawl spaces. Third, ducts crushed by previous contractors or homeowners storing belongings on top of them. When the duct wall is compromised, mastic can’t fix it, and replacement is the only honest answer.
A note on safety and scope: duct replacement in a slab foundation is invasive work that involves cutting through flooring to reach buried runs. For slab systems, we map the ducts first, identify the failed sections, and replace only what’s actually damaged unless the entire system is compromised. Anyone who quotes full slab replacement without a camera inspection first isn’t doing you a favor.
FAQs – Duct Repair & Sealing Cost
Is it cheaper to repair or replace ducts in Miami?
Repair is almost always cheaper when the duct walls are sound, with typical Miami repair jobs running $200 to $1,800 versus $3,000 to $7,500 for full replacement. The decision hinges on the condition of the duct material itself, not the price tag. If the ducts are torn, crushed, or mold-saturated, sealing won’t hold. Call (850) 779-9240 and we’ll inspect honestly and tell you which side of the equation you’re on.
How much does it cost to seal ductwork in a 2,000 sq ft home?
For a 2,000-square-foot Miami home with accessible attic or interior-chase ductwork, expect to pay $800 to $1,800 for whole-system sealing of all reachable joints and connections. If the ducts are in a slab or behind finished walls, Aeroseal sealing typically runs $1,800 to $2,800 for that same floor plan. The written estimate we give you includes the sealant type, the number of runs we’ll address, and the exact price before we touch a single vent.
Can you fix leaking ducts the same day?
In most cases, yes. Isolated leaks, disconnected boots, and failed tape repairs at accessible locations are same-day jobs for our Miami technicians. Whole-system sealing usually takes four to eight hours depending on the home. Call us by mid-morning and we’ll tell you straight whether your repair can be done today or needs a scheduled visit within the week.
How much does Air Duct Cleaning cost if I do it with sealing?
Combined cleaning and sealing jobs in Miami typically run $700 to $1,900 depending on system size and accessibility, which is $100 to $300 less than scheduling the two jobs separately. The cleaning step uses negative-air extraction, which pulls loosened debris out of the system under vacuum pressure while HEPA filtration keeps it out of your living space. That means the sealing compound bonds to clean metal, not dust.
Why do duct repair quotes in Miami vary so much?
Because some quotes include code compliance, proper mastic, and a written guarantee, and some don’t. A $400 bid to “seal your ducts” usually means taping a few visible joints with materials that won’t survive one Miami summer. A $1,400 bid should include inspection, cleaning if needed, mastic sealing of all accessible connections, and a 365-day written guarantee. If a number looks too low, ask what’s excluded. Call (850) 779-9240 for a free written estimate with nothing excluded.
Get a Written Price Before You Decide
Duct repair and sealing is one of the few home services where a bad job can hide for months, bleeding money through your power bill until the next summer’s heat exposes it. That’s why we put the price in writing before we start, why we show up when we said we would, and why the guarantee on the work has our phone number attached to it. Dale Whitmore and the team at Kestrel Air Duct Miami operate every job under the Kingswell Guarantee, and that’s been the standard since 2004.
Call (850) 779-9240 for a free estimate. You’ll talk to a live person, get a straight answer about what your ducts need, and receive a written price before any work begins.
Pricing reflects the Miami market as of 2026. Kestrel Air Duct Miami offers free estimates – call (850) 779-9240.
Written by Dale Whitmore, Owner at Kestrel Air Duct Miami, serving Miami since 2004.
What Our Customers Say
"Straightforward and fair. They didn't try to upsell me on a bunch of add ons like the last company that quoted me. Just did the ducts and the dryer vent and left."
- Devon Pratt"Set up an appointment for the whole house plus the dryer line. They called the morning of to confirm, showed up in the window, and showed me pictures of the gunk they pulled out. Worth it."
- Terrence Boyd"Booked them because our old HVAC guy mentioned the ducts were filthy. Quote on the phone matched the invoice to the dollar. Polite crew, laid down mats, in and out in about two hours."
- Hannah Kim