Duct Sealing in West Miami - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across West Miami

West Miami’s older bungalows and narrow-lot infill homes lose cooled air through gaps you cannot see, and your utility bills show it every month. We’re Hollis Air Duct Cleaning, and our crews seal ducts across West Miami from dispatch out of our Miami office, reaching homes near Coral Way, Bird Road, and the neighborhoods around Tropical Park with same-week scheduling. Call (361) 326-5060 for a free estimate, and we’ll show you exactly where your system is bleeding air before we quote a flat price to fix it.

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Why Hollis Air Duct Cleaning Is West Miami’s Preferred Duct Sealing Company

We’ve been sealing ducts in this market since 2004, long enough to know that a West Miami home built in 1952 with cinderblock walls and a shallow-pitched roof needs a different approach than a 2010s Mediterranean infill on a 40-foot lot. Our technicians carry mastic rated for Florida humidity and metal-backed tape that holds through August attic heat, not the hardware-store stuff that peels off in six months.

West Miami homeowners leave reviews mentioning the same things: the technician arrived inside the window, explained the leak test results on a tablet, and the final invoice matched the written quote exactly. That consistency comes from The Garrison Standard, which our owner Roy Castellanos enforces on every job, whether we’re working off Flagler Street or in the residential streets near West Miami Middle School.

Our phones are answered by a live person 24 hours a day, 7 days a week. No callback queues, no voicemail loops. When you’re fighting a $400 electric bill in July because your cooled air is dumping into the attic, you want a human who can book you this week, not next.

HVAC Duct Sealing in West Miami

HVAC Duct Sealing in West Miami means closing the gaps, disconnected joints, and deteriorated mastic in ductwork that runs through unconditioned attics and crawlspaces, where summer temperatures hit 140°F and year-round humidity warps every seal that was not applied correctly the first time. Most West Miami homes we seal are losing 20 to 30 percent of their conditioned air before it reaches the rooms, which is why the bedroom stays warm even when the AC runs constantly and the electric bill climbs every month from May through November.

A typical HVAC duct sealing job in West Miami runs $850 – $1,400 for a single-system home, depending on whether we’re resealing accessible metal trunk lines or replacing degraded flex duct that has sagged and torn at the connections. We price by the system, not by the linear foot, and we write the number down before any work starts.

Leak Testing Before Sealing

We pressurize your duct system and measure airflow loss with a calibrated fan. In West Miami’s older bungalows, we regularly find the worst leaks where flex duct meets the air handler in a hot attic, or at register boots that have pulled away from drywall after decades of vibration. You see the numbers before we touch anything.

Mastic vs. Tape in Humid Attics

Water-based duct mastic remains flexible for decades and bonds to metal and flex duct even at Florida humidity levels. We use foil-backed mastic from Abatement Technologies on every joint, then reinforce with metal-backed tape, never plain cloth duct tape that degrades in eighteen months. In West Miami’s salt-laden coastal air, that distinction matters.

Duct Repair in West Miami

Duct Repair in West Miami addresses the physical damage that sealing alone cannot fix: crushed flex duct from a roofing crew stepping in the wrong place, rusted metal trunk lines in crawlspaces that flood during summer downpours, and insulation that has fallen away from ductwork, letting condensation form and drip through ceiling drywall. We see this most often in the 1940s – 1960s bungalows near SW 16th Street and in the narrow-lot infill homes where ductwork was routed through tight, unconditioned spaces to preserve interior square footage.

Typical duct repair in West Miami costs $450 – $950 for isolated section replacement, or $1,200 – $2,100 if we’re rebuilding a return plenum or replacing multiple flex runs after storm damage or long-term neglect. We photograph the damage, show you the scope, and give you a written flat price before we cut any material.

Condensation and Rust Damage

West Miami’s seven-to-eight-month cooling season means cold air runs through metal ducts in 95°F attics for most of the year. That temperature differential creates condensation that pools in low spots and rusts metal from the inside out. We replace rusted sections with insulated flex duct or coated metal, then verify slope and support so water drains instead of collecting.

Post-Storm Inspection and Repair

After named storms or extended power outages, we get calls from West Miami homeowners who smell musty air the moment the AC cycles back on. We inspect for wind-driven debris damage, displaced ductwork, and mold growth on wet insulation, then repair and document the condition for insurance if a claim is pending.

Trusted Brands We Service in West Miami

Our vans stock sealing and repair materials from Rotobrush, Nikro, and Guardsman, plus filtration upgrades from Honeywell and Aprilaire for homeowners who want cleaner air moving through their newly sealed system. Because we dispatch from our Miami office, West Miami customers get fast turnaround on parts without waiting for a shipment from out of state. Our technicians carry the full range of mastic, tape, and flex duct sizes needed for the 6-inch to 14-inch diameters common in local residential systems, so most jobs finish in one visit.

Common Duct Sealing Problems We See in West Miami Homes

• Sagging flex duct in attic spaces above original terrazzo floors. The 1940s – 1960s bungalows near Coral Way and Flagler Street often have flex duct strung across low attics with inadequate support. Over years, the duct sags, pools condensate in the belly, and tears at the connections. We rehang with proper straps and replace damaged sections.
• Disconnected register boots in cinderblock walls. Cinderblock construction does not give duct installers much flexibility. Register boots often connect to flex duct with minimal overlap, and vibration slowly pulls them apart. We find 15 to 25 percent leakage at these points in roughly half the West Miami homes we test.
• Salt corrosion on metal trunk lines near roof vents. West Miami’s proximity to Biscayne Bay means salt aerosol enters attic vents and accelerates rust on uncoated metal ductwork, especially on homes within a mile of the water. We replace corroded sections and recommend filtration upgrades that reduce particulate load.
• Biological growth feeding on dust and moisture inside leaky ducts. When humid outside air pulls into gaps in ductwork, it carries mold spores that colonize on accumulated dust. Sealing stops the moisture source, but we often pair sealing with Air Duct Cleaning in West Miami to remove existing contamination before it spreads.

Pricing for Duct Sealing in West Miami, FL

We Also Serve Cities Near West Miami

Our crews work throughout South Florida and across the state, including Duct Sealing in West Miami as well as scheduled service in Jacksonville, Miami, Tampa, and Orlando. Each location operates independently under The Garrison Standard, with the same written pricing and 365-Day Done Right Promise. We also handle Dryer Vent Cleaning in West Miami for homeowners who want full-system airflow maintenance in one visit.

FAQs About Duct Sealing in West Miami