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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After
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Before
AfterFast, Reliable Duct Sealing Across Miami
Duct sealing in Miami typically runs $800 – $2,400 for a single-family home and $400 – $1,200 per condo unit, depending on access and how much of the system needs attention. We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our Miami office dispatches crews throughout the metro, from Little Havana to Miami Beach, with same-week scheduling on most calls. If your registers blow dusty air, your energy bill keeps climbing, or rooms won’t hold temperature, the problem is often leaky ductwork, and it’s fixable. Call (361) 326-5060 for a written estimate before any work starts.
Our technicians know Miami’s buildings. We’ve sealed ducts in 1960s ranch homes in Coral Gables with original metal trunk lines, in high-rise condos on Brickell Avenue with shared vertical chases, and in post-2000 tract homes in Kendall where flex duct bakes in attic heat. Miami’s humidity, constant AC runtime, and hurricane-season water intrusion create sealing challenges you don’t see in drier climates. We address moisture before we seal, because sealing over mold is a failed job in this city.
Why Hollis Air Duct Cleaning Is Miami’s Preferred Duct Sealing Company
We’ve been in business since 2004, and our Miami crews operate under The Garrison Standard: arrive inside the quoted window, price in writing before touching anything, finish by the book, leave the site clean. That standard matters here because Miami’s condo market is full of moving pieces. Building management, HOA boards, unit owners, sometimes a property management company in another state. We’ve learned who to call, what approvals matter, and how to document our work so everyone’s covered.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Phones are answered by a live person, 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday for a scheduling question.
Every duct sealing job carries our 365-Day Done Right Promise in writing. If the seal fails within a year, we come back at no charge, including a free second visit. We don’t negotiate this after the fact. It’s on the paperwork you sign before we start.
We use professional-grade equipment from Nikro, Honeywell, and Aprilaire, the same tools commercial crews use. Our rotary brush systems and negative-air machines with HEPA filtration let us inspect, agitate, and seal without spreading debris through your living space or your neighbor’s.
Air Duct Sealing in Miami
Air Duct Sealing in Miami means closing the gaps, separations, and deteriorated connections in your HVAC ductwork so conditioned air reaches the rooms it’s supposed to reach. In a city where AC runs 10 – 12 months a year and electricity rates rank among the highest in the continental U.S., leaky ducts can waste 20 – 30% of your cooling energy. We seal with mastic and mesh on metal duct, proper collars and clamps on flex duct, and we verify our work with pressure testing where access allows.
Miami homeowners need duct sealing when rooms stay hot despite the AC running constantly, when dust streaks appear around registers, when energy bills spike without explanation, or when a camera inspection shows separated joints or deteriorated tape. In condos, the need often shows up as musty odors that return after cleaning, because humid air is being pulled from shared chases into your supply stream through an unsealed junction.
Condo and HOA Coordination
In Miami’s high-rise condos with central chiller systems, the duct run from the vertical chase to the unit’s air handler is often the owner’s sealing responsibility, while the chase itself belongs to the HOA. A duct sealing job here legally and practically splits at the unit boundary, something you don’t encounter in single-family metros. We document where our work ends and the building’s begins, and we coordinate with management to verify the shared chase is intact before we seal your side. This prevents the callback loop that happens when a contractor seals only the visible trunk lines and misses the hidden leak at the chase junction.
Post-Storm Moisture Protocol
After a hurricane or heavy summer storm, homeowners in flood-prone areas like Little Havana and Miami Beach often find water in their ducts. We check for standing water and replace soaked insulation before any sealing. Seal over wet ductwork and you trap mold spores. In Miami’s 75% average relative humidity, that’s a guaranteed problem within weeks.
Duct Sealing Services in Miami
Duct Sealing Services in Miami cover everything from spot repairs on separated flex duct to full-system sealing on older homes with deteriorated metal trunk lines. Our process starts with a camera inspection to locate leaks, followed by agitation and cleaning if the ducts are contaminated, then sealing with materials rated for Miami’s heat and humidity. We don’t use standard foil tape on flex duct in 140°F attics. The adhesive fails within months. We use mastic, mesh, and mechanical fasteners that hold up.
For single-family homes in neighborhoods like Pinecrest or Palmetto Bay, we often find undersized flex duct from the 1980s or 90s that’s crushed, kinked, or pulled loose at the plenum. For condos in Brickell or Edgewater, the issue is usually at the unit-chase junction or a failed flex connector in a mechanical closet. We price each job in writing before starting, with one flat price per system. No per-vent pricing, no add-ons at the door.
Inspection and Documentation
We photograph before, during, and after. You see what we found, what we sealed, and how it looked when we finished. In Miami’s condo market, this documentation also protects you with your HOA or building management if questions come up later about who sealed what and when.
Pressure Testing Where Possible
On accessible systems, we run a pressure test after sealing to verify the leak reduction. Not every Miami building allows full access for this, but where we can test, we do. It’s the only way to prove the seal held.
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.
Trusted Brands We Service in Miami
We stock parts and sealing materials from Honeywell, Aprilaire, and Nikro, brands that hold up in Miami’s climate. Honeywell’s filtration and airflow components integrate with systems common in South Florida condos. Aprilaire’s humidity control products pair well with sealed ductwork in a city where moisture management is half the battle. Nikro’s negative-air equipment lets us contain debris during condo jobs where shared walls mean you can’t afford a mess. We don’t order parts from a catalog while your job waits. Our Miami warehouse keeps common collars, mastic, mesh, and flex duct in stock, so most sealing jobs finish in one visit.
Common Duct Sealing Problems We See in Miami Homes
- HOA boundary leaks in condos. Sealing only the visible trunk lines in a condo unit while ignoring the junction where the unit’s duct meets the HOA-owned vertical chase leaves a hidden leak that pulls humid chase air into the supply stream. We see this in buildings from Miami Beach to Coral Gables, and it’s the most common cause of callbacks after a cheap sealing job.
- Foil tape failure in hot attics. Standard foil tape on flex duct in a 140°F attic or mechanical closet. Miami’s heat and humidity cause the adhesive to fail within months, reopening the leak. We use mastic and mechanical fasteners, not tape alone.
- Sealing over post-hurricane moisture. Skipping a moisture check before sealing after a storm. If standing water or soaked insulation is present in the duct, sealing traps mold spores and makes the problem worse. We inspect with cameras and moisture meters first.
- No building management coordination. Failing to coordinate with building management for access to shared chases leads to incomplete sealing and repeated callbacks. In Miami’s high-rises, this step isn’t optional. We handle the calls and the documentation.
Pricing for Duct Sealing in Miami, FL
A typical residential duct sealing job in Miami runs $800 – $2,400 for a full single-family system, and $400 – $1,200 per condo unit depending on access and how many leaks we find. What moves the price: whether we need to access a crawl space or attic versus a mechanical closet, how much deteriorated flex duct needs replacement versus simple reconnection, and whether post-storm moisture remediation is needed before sealing can begin. Condo jobs in high-rises sometimes carry a building access fee that the HOA may or may not cover. We sort that out during our initial inspection.
We give you one flat price per system, agreed in writing, before any work starts. No per-vent pricing. No teaser coupon that balloons once the technician is inside. We show you the camera footage, explain what we found, and you sign off on the exact scope and price. Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Miami
Our crews work throughout the metro, including Miami Beach, Coral Gables, Key Biscayne, and Hialeah. Each job carries the same written price guarantee and 365-Day Done Right Promise, whether it’s a single-family home in Coral Gables or a high-rise unit on Duct Sealing jobs in South Beach. Dispatch and scheduling are coordinated from our Miami office.
Serving Miami, FL - Our Local Coverage Area
We’re based in the Miami 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 About Duct Sealing in Miami
The unit owner is typically responsible for the duct run from the vertical chase to their air handler, while the chase itself belongs to the HOA. We document this boundary on every condo job and coordinate with building management to verify the shared portion is intact before sealing your side. Call (361) 326-5060 if you’re unsure where your responsibility starts. We can inspect and clarify before any work begins.
Miami’s 75% average humidity and year-round AC runtime mean leaky ducts pull constant moisture into your system, creating mold conditions that don’t exist in drier climates. Sealed ducts also cut cooling costs significantly in a city where electricity is expensive and AC runs 10 – 12 months a year. Call (361) 326-5060 for a free inspection and written estimate.
Not until the water is removed and any soaked insulation is replaced. Sealing over wet ductwork traps moisture and guarantees mold growth in Miami’s humidity. We check with cameras and moisture meters first, dry or replace affected materials, then seal. Call (361) 326-5060 after any storm flooding and we’ll assess before sealing.
We use negative-air containment with HEPA filtration, the same system we use in hospitals and commercial buildings. This captures debris at the source instead of letting it travel through shared chases. We also schedule access through building management and work within your building’s quiet hours when required. Call (361) 326-5060 to discuss your building’s specific access rules.
Dust streaking from registers, musty odors that return after cleaning, rooms that won’t hold temperature, and energy bills that climb despite normal usage. In Miami condos, the most telling sign is a musty smell that persists or returns quickly after duct cleaning, which usually means humid air is leaking into your supply stream from an unsealed chase junction. Call (361) 326-5060 for a camera inspection that shows exactly where the leak is.
Our crew was called to a 1980s condo tower on Brickell Avenue where the 14th-floor owner complained of dust streaking from the registers and a musty smell that returned weeks after a previous cleaning. Using camera inspection and agitation tools under negative pressure with HEPA filtration, we found the flex duct connector at the air handler had separated at the collar, pulling attic-humid air into the supply run. We sealed the collar with mastic and mesh, reconnected the duct, and coordinated with building management to verify the shared chase was intact. Within a week, the musty odor was gone and the owner reported lower dust on surfaces.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Miami since 2004.