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

Fast, Reliable Duct Sealing Across North Miami

Duct sealing in North Miami typically runs $450 – $1,200 for a whole-house seal on mid-century homes, with most jobs completed in a single day. If your vents blow weak, your bedroom never reaches setpoint, or your energy bill climbs every summer, the problem is likely leaking seams in the original ductwork, not your AC unit itself.

Call (361) 326-5060

We serve North Miami from our Miami-area dispatch office, and our crews know the local housing stock: the concrete-block ranches from the 1950s through 1970s in Sans Souci and Keystone Point, the low-pitch attics that trap heat and moisture, and the original galvanized metal ducts that Biscayne Bay salt air has been corroding for decades. When you call (361) 326-5060, a live person answers, and we’ll give you a written price before any work starts.

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

We’ve been part of the Garrison Partners family since 2004, and our Duct Sealing team has handled enough North Miami homes to know the difference between a quick register-boot patch and the real seam-and-collar work these houses need. Homeowners here aren’t dealing with new-construction dust; they’re living with 40-year-old duct runs that Hurricane Andrew patched rather than replaced, and salt aerosol that keeps reopening what was sealed last season.

Our technicians are background-checked and uniformed, and they work under The Garrison Standard: arrive inside the quoted window, price in writing, complete the job by the book, leave the site clean. Every repair carries our 365-Day Done Right Promise – if the seal fails within a year, we return and make it right at no charge, including a free second visit. No estimates that balloon once we’re inside. No per-vent pricing games. One flat price per system, agreed before we touch anything.

Phones are answered by a live person 24 hours a day, 7 days a week. If you’re smelling musty air from a Keystone Point attic or fighting a 9-degree temperature split in a Sans Souci bedroom, we know what to look for and we know where to find it.

Duct Sealing Services in North Miami

Duct Sealing Services in North Miami focus on the seam-and-collar failures that generic duct cleaners miss, because mid-century homes here still hide original sheet-metal trunks behind galvanized sleeves, and the worst leaks are inside wall cavities or under low-pitch attic decking where salt air corroded the seams long before the register boots failed. A typical whole-house seal runs $450 – $1,200 depending on accessibility, the extent of corrosion, and whether we’re patching three collar seams or rebuilding a rust-jacked trunk. Most jobs finish in four to six hours.

Leak Detection and Source Identification

We pressurize the system and use smoke pencils and thermal imaging to map the leak path, but in North Miami the critical step is camera inspection of the trunk line. The visible joints at the register boots often test tight while the collar seams inside the wall cavity blow open under pressure. We find the disconnects you can’t see from the living room.

Mastic Sealing with Reinforced Mesh

For corroded galvanized metal, we clean the surface to bare metal under negative pressure, then apply duct-sealing mastic reinforced with fiberglass mesh. On salt-pitted trunk lines, we sometimes need to sleeve the worst sections with new sheet metal before sealing. The goal is a permanent seal, not a seasonal patch that reopens by the next hurricane.

Duct Insulation in North Miami

Duct Insulation in North Miami addresses the condensation and energy loss that follow sealing work, because a tight duct in an unconditioned attic still sweats when attic temperatures hit 140°F and humidity stays above 70% for months. We insulate with formaldehyde-free fiberglass wrap or closed-cell foam sleeves, depending on space constraints in your low-pitch attic. Typical insulation work runs $300 – $800 when bundled with sealing, or $500 – $1,100 as a standalone job in tight attic spaces.

Attic Trunk Line Wrapping

The original galvanized trunks in 1960s North Miami homes gain significant efficiency from proper wrapping, but space is tight under low-pitch decking. We use high-R-value fiberglass with a reinforced vapor barrier, taped at every seam. The wrap stops condensation that would otherwise re-corrode the metal we just sealed.

Flex Duct Sleeve Replacement

Where previous repairs left collapsed or water-damaged flex patches, we replace the entire run rather than patch over mold. New insulated flex, properly supported and sealed at both ends, eliminates the low points where condensate pools after a storm.

Trusted Brands We Service in North Miami

Our trucks carry professional-grade equipment from Nikro negative-air machines and Honeywell filtration components to Aprilaire humidity control products and Abatement Technologies HEPA containment systems. For North Miami’s salt-corroded metal ductwork, we stock galvanized repair sleeves, mastic rated for marine environments, and reinforced mesh that holds against thermal expansion in unconditioned attics. Most parts are on the truck, so we’re not waiting on a supply house while your attic sits open. We explain what we’re using and why, in plain terms, before we start.

Common Duct Sealing Problems We See in North Miami Homes

• Collar seams rust-jacked open by salt aerosol. Biscayne Bay salt air penetrates attic vents and corrodes galvanized metal from the inside out. Mastic pulls away from pitted surfaces within a season unless the metal is properly prepped and sleeved first.
• Hidden trunk disconnects inside wall cavities. Because the original sheet-metal trunk runs inside the concrete-block wall, a leak at the collar seam pressurizes the cavity and pulls attic air through every crack. The bedroom stays warm and musty even when the register blows hard.
• Collapsed flex patches over condensate pools. After hurricane-season power outages, attic humidity spikes and condensate collects at low points in the duct run. Previous flex repairs sag into the water, collapse, and become mold sources that sealing alone won’t fix.
• Original trunks mistaken for return chases. In 1960s homes with multiple renovations, the supply trunk is sometimes buried so deep that a contractor seals only the visible return duct, leaving the real leak untouched and the musty odor persistent.

Pricing for Duct Sealing in North Miami, FL

We Also Serve Cities Near North Miami

Our North Miami crews also handle jobs 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.

FAQs About Duct Sealing in North Miami