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Is your FPL bill climbing even though you keep the thermostat the same? The EPA says 20-30% of the air in your ducts is lost to leaks. In South Florida, where your AC runs 10 months a year, that wasted air is costing you hundreds every year. We find the leaks, seal them with professional-grade materials, and prove the improvement with before-and-after pressure testing. Free diagnostic inspection, no obligation.
Air duct sealing closes the gaps, cracks, and disconnections in your ductwork that let conditioned air escape into your attic instead of reaching your rooms.
According to the EPA and the Department of Energy, the average home loses 20-30% of the air moving through its duct system to leaks, holes, and poorly connected ducts. In South Florida, where your AC runs nearly year-round, that translates to hundreds of dollars wasted on your FPL bill every year cooling your attic instead of your living room.
Professional duct sealing uses mastic sealant, metal-backed foil tape, and aeroseal technology to permanently close every leak point. Unlike duct tape (which fails within months in Florida heat), these materials are engineered to withstand the 140-150 degree temperatures in your attic and remain effective for 10+ years.
Despite the name, duct tape is one of the worst materials for sealing ductwork. Lawrence Berkeley National Laboratory tested every major duct tape brand and every single one failed. In Florida attics reaching 150 degrees, the adhesive dries out, the tape peels away, and your leaks come right back -- usually within a year.
UL-listed, flexible, permanent. Applied to joints, seams, and connections. The gold standard for accessible duct sealing.
Aluminum-backed with heat-rated adhesive. Used on accessible joints and connections where mastic is impractical.
Aerosolized sealant particles injected into ducts. They find and seal leaks from the inside -- even in hard-to-reach areas.
South Florida's climate creates conditions that are uniquely brutal on ductwork. Your ducts are failing faster than you think.
Your ducts sit in an attic that routinely hits 140-150 degrees Fahrenheit in summer. Duct tape adhesive melts and fails. Original flex duct connections loosen as materials expand and contract daily. Every joint is under thermal stress 365 days a year.
Florida's 80-90% humidity accelerates corrosion on metal duct connections and degrades the adhesive on tape joints. The constant humidity cycling -- condensation forming then evaporating -- weakens duct connections that would last decades in a dry climate.
If you live within 10 miles of the coast -- which covers most of Miami-Dade and Broward -- salt air enters your attic and corrodes metal duct connections, screws, and plenums. Coastal homes lose duct seal integrity 2-3 times faster than inland homes.
Most South Florida homes built after 1990 use flex duct. Builders install it fast -- and the connections often are not sealed properly from day one. Flex duct connections rely on zip ties and tape, both of which fail over time. If your home is 10+ years old, your duct connections are almost certainly leaking.
Sealing leaking ducts does not just lower your bill. It fixes hot spots, reduces humidity, extends your AC's life, and cleans up your indoor air.
When every CFM of cooled air reaches your living spaces instead of your attic, your AC runs shorter cycles. Less runtime = lower electricity consumption = lower FPL bill. Most homeowners see the difference within the first billing cycle after sealing.
That bedroom that never cools down? That hallway that is always warmer than the rest of the house? Uneven cooling is the #1 symptom of leaking ducts. When we seal the leaks, every room gets the air it is supposed to get.
Leaking ducts in your attic pull in insulation fibers, dust, pollen, and attic contaminants and blow them into your living spaces. Sealing the leaks means your AC only moves filtered, conditioned air -- not attic air mixed with fiberglass particles.
When 20-30% of your air leaks out, your AC compensates by running longer and working harder to maintain the thermostat setting. Sealed ducts reduce that strain, leading to fewer repair calls, lower maintenance costs, and a longer system lifespan.
Leaky duct runs to specific rooms deliver less air to those rooms. After sealing, air distribution equalizes across your entire home. No more cranking the thermostat down just to cool one room while freezing another.
Leaking return ducts pull hot, humid attic air into your system. That moisture enters your home, causes indoor humidity spikes, condensation on windows, and creates conditions for mold growth inside your ductwork. Sealing stops it at the source.
Licensed HVAC contractor. Before-and-after pressure test included.
Every dollar your AC spends cooling your attic is a dollar wasted. Professional duct sealing stops the leak and puts that money back in your pocket. Here is what the numbers look like for a typical Miami home.
A Miami homeowner spending $250/month on FPL could be losing $50-75/month to duct leaks alone. Seal those leaks and you recover $600-900 per year -- every year for the next decade. That is $6,000-9,000 in cumulative savings from a single service visit.
If you recognize any of these symptoms, your duct system is likely losing conditioned air through leaks, gaps, or disconnected joints.
Your thermostat is the same but the bill keeps going up. Your AC is running longer cycles to compensate for lost air. The leak is in your ducts, not your AC unit.
One bedroom stays warm while the rest of the house is fine. The duct feeding that room has a leak, crack, or disconnection. The cooled air is going into your attic instead.
Leaky return ducts pull unfiltered attic air -- full of insulation fibers, dust, and particles -- directly into your duct system and blow it into your rooms.
Leaking ducts pull hot, humid attic air into your system. Your AC cannot dehumidify fast enough. You feel clammy even though the temperature reads normal.
Your system is working but it cannot keep up because 20-30% of its output is being dumped into the attic. The thermostat never reaches the target.
If you can see daylight between duct connections, flex duct pulled away from register boots, or tape hanging loose in your attic, those are active leak points.
The living room is freezing but the master bedroom is warm. Air distribution is uneven because leaks in specific duct runs are stealing air from those rooms.
Original builder-installed duct connections degrade over time. If your home is a decade old and no one has ever sealed the ducts, you are almost certainly losing air.
We do not guess where the leaks are. We measure, locate, seal, and re-measure. You see the before-and-after numbers proving the improvement.
We attach a calibrated duct blaster to your system and measure total duct leakage in CFM (cubic feet per minute). This gives us a baseline number showing exactly how much air your system is losing. Most Miami homes test at 150-300 CFM of leakage -- the equivalent of a window left open while your AC runs.
Free -- No ObligationUsing smoke pencils, thermal imaging cameras, and physical inspection, we trace every leak point in your duct system: connection joints, register boots, plenum seams, flex duct tears, and any disconnections. We photograph each one so you see exactly what we found.
Thermal Imaging Included
Every leak gets sealed with the right material for its type. UL-listed mastic sealant for joints and seams. Metal-backed foil tape for accessible connections. Aeroseal technology for hard-to-reach interior leaks. No duct tape. No shortcuts. Materials rated for Florida's extreme attic temperatures.
10+ Year MaterialsWe re-test the system with the same calibrated equipment. You see the before-and-after CFM numbers side by side. A well-sealed system should show leakage reduced by 60-80% or more. This is not subjective -- it is measured, documented proof.
Before/After DocumentationWe walk you through the results, show before-and-after photos of every sealed connection, and provide written documentation of the measured improvement. You know exactly what was done, what the leakage numbers were before and after, and what to expect on your next FPL bill.
Written Documentation IncludedNot every duct problem requires the same solution. Here is how to know which service your home actually needs -- and why sealing is almost always the right first step.
| Factor | Duct Sealing | Duct Repair | Full Replacement |
|---|---|---|---|
| Best for | Gaps, cracks, loose connections | Torn sections, crushed ducts | Severely damaged or 20+ year old systems |
| Cost | $$ | $$$ | $$$$ |
| Timeframe | 3-6 hours (same day) | 1-2 days | 2-5 days |
| Energy savings | ✓ 20-30% | ✓ Varies | ✓ 25-40% |
| Disruption to home | Minimal | Moderate | Significant |
| ROI payback | 1-2 years | 3-5 years | 5-10 years |
Our recommendation: Start with duct sealing. It is the most cost-effective first step and solves the majority of duct problems. During our diagnostic, if we find damage that requires duct repair or full replacement, we tell you honestly and explain why. We never upsell sealing when repair is needed, and we never push replacement when sealing will solve the problem.
Not every HVAC company offers duct sealing, and most that do skip the diagnostics. Here is what makes our approach different.
We do not guess whether the sealing worked. We measure duct leakage in CFM before we start and again after we finish. You see the numbers. Most companies skip this step because they do not own the equipment.
License #CAC1817115. Not a handyman, not a general contractor, not a carpet cleaner offering duct work on the side. We are a licensed HVAC company with 20+ years of experience and specialized duct sealing tools in every truck.
1,000+ homes serviced across Miami-Dade and Broward. We know the flex duct configurations, attic conditions, and humidity challenges specific to South Florida. Our technicians are not learning on your house -- they have sealed ducts in homes exactly like yours.
We do duct cleaning, duct sealing, duct repair, and AC maintenance -- all from the same licensed team. If we find something during sealing that needs cleaning or repair, we handle it in the same visit. No second contractor, no second appointment.
Accredited with the Better Business Bureau with an A+ rating. We do not pressure you into services you do not need. We show you the diagnostic results, explain your options, and let you decide. Our reputation is built on honesty, not upselling.
UL-listed mastic sealant, metal-backed foil tape, and aeroseal technology. No duct tape, no shortcuts, no consumer-grade products. Our materials are rated for the extreme temperatures in Florida attics and last 10+ years.
Real feedback from homeowners across Miami-Dade and Broward County who sealed their ducts with us.
"Our FPL bill was $340 in July. They came out, pressure tested everything, and found massive leaks at three duct connections in the attic. After sealing, our August bill dropped to $265. Same thermostat setting, same usage. The before-and-after pressure test numbers were dramatic. Should have done this years ago."
"The back two bedrooms in our house were always 5-6 degrees warmer than the rest of the home. We thought the AC was too small. Turns out the flex duct to those rooms had come loose at the plenum. They sealed it, and now the whole house cools evenly. Fixed a problem we had lived with for three years."
"We had another company 'seal' our ducts with duct tape two years ago. It all peeled off in the attic heat. These guys showed up with mastic, metal tape, and a thermal camera. They found 11 leak points the other company missed. The pressure test showed a massive improvement. Very honest, very thorough."
The most common questions we get about duct sealing, energy savings, costs, and the process.
Duct sealing cost depends on the size of your duct system, the number of leaks found, duct accessibility, and the sealing method used. We provide a free diagnostic inspection where we pressure-test your ducts and show you exactly where the leaks are before quoting a price. No obligation, no pressure. Most homeowners find that duct sealing pays for itself within 1-2 years through lower FPL bills. Call (305) 607-3244 or book online for your free diagnostic.
Yes. The EPA estimates that 20-30% of the air moving through a typical duct system is lost to leaks. In South Florida, where your AC runs 8-10 months per year, that lost air translates directly to wasted electricity. Sealing those leaks means your AC delivers more cooled air into your rooms and runs shorter cycles. Most homeowners see a noticeable drop in their FPL bill within the first billing cycle after duct sealing.
Professional duct sealing with mastic sealant or aeroseal technology lasts 10 years or more. Mastic sealant is designed to stay flexible and adhesive permanently, unlike duct tape which dries out and fails within 1-3 years in Florida heat. We use only professional-grade materials rated for the extreme temperatures in Miami attics.
Duct cleaning removes dust, debris, mold, and contaminants from inside your ducts. Duct sealing closes gaps, cracks, and disconnections to stop conditioned air from escaping. They solve different problems -- cleaning improves air quality while sealing improves energy efficiency. Many homes need both, and we often recommend duct sealing after cleaning since the ducts are already exposed and accessible.
No. Lawrence Berkeley National Laboratory tested every major duct tape brand and every one failed on ductwork. In Florida attics where temperatures reach 140-150 degrees, duct tape adhesive dries out and peels away -- usually within a year. Professional duct sealing uses UL-listed mastic sealant, metal-backed foil tape, or aeroseal technology -- materials engineered to withstand the heat, humidity, and movement that Florida ductwork endures.
Common signs include: unusually high FPL bills, rooms that will not cool evenly, excessive dust in your home, visible gaps at duct joints in your attic, your AC running constantly, and indoor humidity problems despite running the AC. We perform a free diagnostic inspection using pressure testing and thermal imaging to locate every leak and show you the results before recommending any work.
We seal both flex duct and metal duct. Most South Florida homes use flex duct, which is prone to leaks at connection points where the duct meets the plenum, register boots, and junction boxes. Metal duct is more common in older homes and commercial buildings. Our technicians carry materials for both types and can handle either in a single visit.
Most residential duct sealing jobs take 3-6 hours depending on system size, number of leaks, and accessibility. This includes initial pressure testing, leak detection, sealing, and a post-seal pressure test to verify improvement. We complete most jobs in a single visit so you start saving on your next FPL bill immediately.
Yes. Leaking ducts in your attic pull in hot, humid attic air and inject it into your living spaces. This is one of the most common causes of indoor humidity problems in South Florida. Sealing the leaks means your AC moves only conditioned air into your rooms, reducing indoor humidity, preventing condensation, and reducing conditions that lead to mold growth inside ductwork.
Yes. We provide duct sealing for single-family homes, condos, townhomes, and commercial buildings throughout Miami-Dade and Broward County. Condo duct sealing uses compact equipment for tight mechanical spaces. Commercial sealing addresses larger duct runs, rooftop units, and plenum systems. We carry COI documentation for buildings that require it. Call (305) 607-3244 for a free diagnostic at your property.
Air Duct Cleaning Miami provides professional air duct sealing throughout Miami-Dade and Broward County. We use mastic sealant, metal-backed foil tape, and aeroseal technology to seal leaking ducts, reduce energy waste by 20-30%, and lower FPL bills. Every duct sealing job includes before-and-after pressure testing to verify improvement. We also offer duct cleaning, duct repair, and AC maintenance. FL Licensed HVAC Contractor #CAC1817115. BBB A+ Accredited. Call (305) 607-3244 for a free diagnostic inspection.
Duct sealing works best when your entire system is in good shape. We offer every service your ductwork and AC need under one licensed roof.
We provide professional duct sealing in every major city across South Florida. Same-day diagnostic available in all cities listed below.
Do not see your city? Call (305) 607-3244 -- we likely serve your area. View our air duct cleaning pricing.
Free duct sealing diagnostic. Before-and-after pressure testing. Licensed HVAC contractor #CAC1817115. 1,000+ homes served across Miami-Dade and Broward County.
