Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
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.
Fast, Reliable Duct Sealing Across Miami Beach
Duct sealing in Miami Beach isn’t a luxury add-on. It’s the difference between an HVAC system that strains against salt-corroded seams and one that holds conditioned air where it belongs. Our crews work Collins Avenue high-rises, Sunset Harbour condos, and the tree-lined streets of North Beach every week. We know the buildings, we know the parking restrictions, and we know what beachfront air does to ductwork. Call (850) 660-3272 for a written quote before any work starts.
Hollis Air Duct Miami runs on The Garrison Standard: arrive inside the quoted window, price it in writing before we touch anything, finish by the book, and leave the site clean. Our Duct Sealing team has been doing exactly that since 2004, and we back every job with a 365-Day Done Right Promise. If a seam fails within a year, we return and re-seal it at no charge. That’s not a verbal promise. It’s written on every invoice.
Why Hollis Air Duct Miami Is Miami Beach’s Preferred Duct Sealing Company
Miami Beach presents a set of challenges most duct sealing companies never see. High-rise risers with decades of salt corrosion. Shared dryer vent stacks running between units. Loading zones that require hand-carried equipment and a working knowledge of each building’s freight elevator schedule. Our technicians are background-checked, uniformed, and trained to work inside occupied condos without leaving a trail of mastic or debris.
We’re part of the Garrison Partners family, and this location is independently owned and operated under Roy Castellanos. That means the crew answering your call in Miami Beach is the same crew that shows up at your door. No call center handoffs. No third-party contractors. Just a live person answering the phone 24/7, and a written price before the van is even unloaded.
Our equipment includes Rotobrush rotary brush systems and Nikro negative-air machines, the same gear commercial crews use on mid-rise and high-rise projects. For sealing, we carry professional-grade mastic and aluminum tape, not hardware-store substitutes that crack inside a salt-laden chase within a season. When a Miami Beach condo board asks for proof of work, we provide before-and-after photos and a scope-of-work summary they can file.
Styles & brands we work with
Duct Insulation in Miami Beach
Duct insulation in Miami Beach means wrapping or re-wrapping duct runs that pass through unconditioned spaces: chases, mechanical rooms, or the gap between a drop ceiling and the slab above. In a city where the dew point sits above 70°F for most of the year, bare metal ducts sweat. That condensation soaks into drywall, feeds mold, and drips onto whatever is below. Insulation stops the sweating at the source.
For Miami Beach condos and homes, duct insulation typically runs $800 to $1,600 depending on the length of exposed duct and access difficulty. Split systems with short, exposed trunk lines land on the lower end. Chases that snake through a 1960s high-rise core run higher because the work is slower and the clearances are tight.
Insulating Condo Chases and Riser Ducts
Vertical risers in older Miami Beach buildings are rarely insulated to modern code. The metal duct inside the chase condenses moisture against the surrounding concrete, and the result is a humid, musty smell that follows the air handler. We re-insulate with closed-cell material and seal the seams before wrapping, so moisture never reaches the metal.
When Salt Air Eats the Insulation First
Fiberglass duct wrap in beachfront buildings absorbs salt and moisture over time. It compresses, loses R-value, and begins to smell like wet cardboard. If your Duct Sealing estimate reveals degraded wrap, replacing it is usually the more honest repair than sealing over a failing jacket. We’ll show you photos so you can see it yourself before approving the work.
HVAC Duct Sealing in Miami Beach
HVAC duct sealing in Miami Beach closes the gaps where conditioned air escapes before it reaches a single register. In older Miami Beach buildings, original ductwork from the 1960s and 1970s has seam gaps you can feel with your hand. Salt air has been eating at those metal seams for fifty years. Every gap pulls humid outside air into the supply side and dumps cooled air into wall cavities on the return side.
A typical whole-system HVAC duct sealing job in Miami Beach runs $1,200 to $2,800, depending on the number of units served by the handler and how much of the duct network is accessible. Single-family homes in Bayside and La Gorce usually fall toward the middle. High-rise units where the ducts run through a shared chase often require coordination with building management, which we handle for you.
Mastic and Tape Done the Right Way
We brush mastic sealant directly onto seams and joints, then follow with aluminum tape where the duct run is accessible. Mastic is the long-game material here: it stays flexible, resists vibration, and doesn’t dry out and peel like old duct tape. In salt-heavy air, that flexibility is what keeps a seam sealed when the building shifts with temperature changes.
Testing After the Seal
After sealing, our techs measure static pressure at the air handler. A sealed system pushes air further with less strain. We also check the return side for pull from building chases, elevator shafts, or corridor air, which happens when shared spaces are not properly isolated from your unit’s return path.
Trusted Brands We Service in Miami Beach
We work on equipment from every major manufacturer you’ll find in Miami Beach condos and homes, including Miami Beach Trane service, and we stock common filters and fittings from Honeywell and Guardsman for same-visit replacements. Our Nikro negative-air machines keep dust and loosened debris from blowing into your unit during cleaning and sealing work, and the Rotobrush systems let us clean and prep duct interiors before sealant is applied. When a Miami Beach building requires specific filter grades or access protocols, our team adapts without slowing down the job.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Miami Beach Homes
- Salt-corroded seams on supply risers. Vertical ducts in beachfront buildings crack along original seams. The gap may be small, but a pressurized supply side pushes conditioned air into the wall cavity instead of the register, and the air handler runs longer to compensate.
- Shared dryer vent stacks backdrafting between units. When the seal between your unit’s dryer run and the shared stack fails, lint and damp exhaust air push back into neighboring runs. One unit’s leak becomes another unit’s problem.
- Restricted loading and equipment access. Collins Avenue and Washington Avenue loading zones are tight. Our techs hand-carry tools and sealant through service entrances and freight elevators, which keeps the job moving but requires coordination most crews aren’t set up for.
- High-rise risers pulling corridor air into returns. When return ducts run through shared chases with unsealed joints, they pull air from hallways, elevator lobbies, and the gap behind the drywall. That air is unconditioned, often humid, and carries whatever is in the common spaces.
Pricing for Duct Sealing in Miami Beach, FL
Expect to pay $1,200 to $2,800 for HVAC duct sealing on a typical Miami Beach unit, and $800 to $1,600 for duct insulation work. A single-family home in North Beach with accessible attic or closet ductwork sits on the lower end. A 1960s Collins Avenue condo with riser ducts inside a shared chase runs higher because access is slower and the building may require scheduled freight elevator time. We write the price down before work starts, and that number does not move when the tech is inside your unit. Call (850) 660-3272 for a free estimate, and we’ll walk you through the scope in plain English.
We Also Serve Cities Near Miami Beach
Our crews cover Duct Sealing in Miami Beach and surrounding areas including Miami, Key Biscayne, and Miami Gardens. If you’re in a nearby community and need the same written-pricing standard, call us and we’ll schedule accordingly.
Serving Miami Beach, FL - Our Local Coverage Area
We’re based in the Miami Beach 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 Beach
Salt air accelerates corrosion on metal duct seams and dries out cheap sealants until they crack and peel. That’s why we use flexible mastic, which holds its bond even as the building shifts and temperature swings work the metal joints. A proper mastic seal under salt-air conditions typically holds for many years, and our 365-Day Done Right Promise covers any premature failure in writing. If a seam opens within a year, we come back and re-seal it at no charge. Call (850) 660-3272 to schedule an inspection.
Duct sealing can stop mold spores and musty air from being pulled into your unit through shared returns and chases, but it can’t eliminate mold growing inside a neighbor’s walls or ducts. What sealing does is isolate your system so that neighbor’s conditioned air, exhaust, and airborne spores stop coming through the gaps in shared riser runs. If you’re in a Miami Beach high-rise and smell mildew that isn’t coming from inside your unit, the shared chase is often the path. Sealing your side of the system is the first practical step. Call (850) 660-3272 for an evaluation.
Yes, in most Miami Beach condominium buildings you’ll need board or management approval before any work touches duct runs inside shared walls or chases. The ducts inside your unit are typically yours, but the chase itself belongs to the association. We provide a written scope of work and proof of insurance that most Miami Beach boards accept without friction. We’ve coordinated access through condo management on Collins Avenue, West Avenue, and Indian Creek Drive, and we’re familiar with the freight elevator and loading dock requirements each building enforces. Call (850) 660-3272 and we’ll help you prepare the paperwork.
Three signs point to leaking ducts in a Miami Beach unit: rooms that never reach the temperature set on the thermostat, dust or a musty smell that returns within days of cleaning, and air that feels humid even when the AC runs constantly. In high-rises, you may also hear air whistling through gaps behind walls or see condensation stains near supply registers. A camera inspection through the duct interior shows exactly where the gaps are. We’ll show you the footage before recommending any sealant. Call (850) 660-3272 to book a camera inspection.
Schedule duct sealing during the building’s off-peak hours, which in most Collins Avenue high-rises means weekday mornings before 10 AM or early afternoon after the lunch rush. Freight elevators are often reserved for moves during the first week of the month, and loading zones get tight during season from November through April. We coordinate directly with your building’s front desk and maintenance team to secure a service window that fits their rules, which saves you the back-and-forth most companies leave to the homeowner. Call (850) 660-3272 and we’ll handle the scheduling for you.
We sealed the supply and return ducts in a 1960s Collins Avenue condo where beach sand and salt residue had accumulated along the seams. Our techs used a camera inspection to locate the gaps, then applied mastic sealant and wrapped accessible sections with aluminum tape. The result: static pressure dropped, the aging air handler stopped cycling as often, and the unit finally held its set temperature. That’s the kind of before-and-after difference most Miami Beach condos see after a proper seal.
If your ducts are leaking, don’t wait for the humidity to do more damage. Call Hollis Air Duct Miami at (850) 660-3272 for a free estimate and a written price before any work starts.
Written by Roy Castellanos, Owner at Hollis Air Duct Miami, serving Miami Beach and surrounding South Florida communities.