Duct Sealing in Alpharetta - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Alpharetta

Duct sealing in Alpharetta typically runs $450 – $1,150 for a full single-system home, with larger two-zone houses in Windward or Crabapple running $900 – $1,900 depending on how much of the ductwork needs mastic and tape work. Most jobs are completed in a single day, and the price is written down before we touch anything. If you’re noticing dusty supply registers, upstairs rooms that never cool like the main floor, or a musty smell when the AC kicks on in July, call us at (762) 769-7145. We serve Alpharetta from our Atlanta dispatch office with local crews who know these neighborhoods.

Call (762) 769-7145

Alpharetta’s housing stock is a big reason this work matters. Most homes here were built between the 1990s and 2010s, meaning the original flexible ductwork is now 15 to 35 years old. Builder-grade flex duct was never meant to last forever. Connections loosen at the takeoffs, tape dries and peels, and humid attic air starts moving through gaps that should be sealed tight. The result is air you paid to condition leaking into the attic while insulation dust and attic air get pulled into the supply side. That’s the problem we fix. This is our Duct Sealing specialty, and we do it by the book.

Why Hollis Air Duct Alpharetta Is Alpharetta’s Preferred Duct Sealing Company

We run on The Garrison Code. That means technicians arrive inside the quoted window, background-checked and in uniform, with a written price before any work starts. No exceptions. The price does not move at the door. Every job is covered by the 365-Day Done Right Promise, which is a written guarantee that if the work fails within a year, we return and make it right at no charge – including a free second visit. That’s not a marketing phrase. It’s the standard Roy Castellanos holds every Alpharetta job to.

Alpharetta homeowners have been burned by crews that show up late, quote one number on the phone, then inflate the invoice once the van is parked outside. We compete against that by being the most disciplined crew in the trade. Our equipment is professional-grade: Rotobrush rotary brush systems, Nikro negative-air machines, and filtration products from Honeywell, Aprilaire, and Abatement Technologies. These are the tools commercial crews use, explained in plain English on every job so you understand exactly what’s being done to the air moving through your home.

When you call (762) 769-7145, a live person answers. Day or night. Seven days a week. You’ll never sit through a voicemail queue or wait for a callback on Monday. That matters when you’ve got a leaky return duct pulling attic air into your finished basement in the middle of August.

Duct Repair in Alpharetta

Duct Repair in Alpharetta means fixing what’s broken in the system: reconnecting flex duct that has pulled loose at takeoffs, replacing crushed or collapsed runs, and sealing holes that have opened in supply or return plenums. In homes built in the 1990s through 2000s across Alpharetta, builder-grade flex duct loosens at the takeoffs over time, allowing attic air and loose insulation to enter the supply side. A typical duct repair in Alpharetta runs $225 – $650 depending on how many runs need work and whether access requires attic or crawlspace entry.

Reconnecting Loose Takeoffs

The most common repair in Alpharetta attics is reconnecting flex duct that has pulled away from the metal takeoff collar. When this happens, the blower is pushing conditioned air into the attic instead of your bedrooms. We pull the duct back onto the collar, seal the connection with mastic and UL-listed tape, and test airflow at the register to confirm the fix.

Repairing Crushed or Blocked Runs

In finished-basement homes and houses with crowded attic trusses, flex duct gets crushed by stored boxes, insulation, or poor original installation. A crushed run can cut airflow to a room by half. We replace the damaged section and reroute it so it stays clear, then verify static pressure at the air handler before we leave.

Air Duct Sealing in Alpharetta

Air Duct Sealing in Alpharetta is the systematic process of closing every leak in your supply and return ductwork so the air you pay to heat and cool actually reaches the rooms it’s meant for. The job involves camera inspection to find gaps, then sealing seams, takeoffs, and joints with mastic sealant and UL-listed tape where needed. A full-system seal in a typical 3,500 – 4,500 sq ft Alpharetta home runs $800 – $1,600. Homes with two zones or extensive attic duct runs fall on the higher side.

Mastic Sealing at Seams and Takeoffs

Mastic is a thick, brush-on sealant that hardens into a durable, flexible seal. We apply it at every seam, collar, and takeoff in the system. Unlike tape alone, mastic doesn’t dry out and peel with attic heat cycling. It’s the same material commercial HVAC crews use, and it’s the standard we follow on every Alpharetta job.

Return-Side Sealing

Return ducts are under negative pressure, which means every gap pulls attic air, dust, and humidity into your HVAC system. In Alpharetta’s humid subtropical summers, that moisture can condense inside the return plenum and support microbial growth on duct liners. Sealing the return side is just as important as the supply side. We camera-inspect the full return path before sealing so nothing gets missed.

Trusted Brands We Service in Alpharetta

We stock mastics, tapes, and replacement components compatible with the equipment most common in Alpharetta homes, including filtration and air-quality products from Honeywell, Aprilaire, and Guardsman. Our negative-air machines from Nikro and rotary brush systems from Rotobrush are the same professional-grade tools used on commercial jobs. When you call about a duct sealing issue in Alpharetta, we’re not bringing hardware-store gear to a professional job. We’re bringing tools built for this exact work, and we’ll explain what each piece does before we start.

Common Duct Sealing Problems We See in Alpharetta Homes

• Builder-grade flex duct loosening at takeoffs. Homes built in the 1990s and 2000s across Alpharetta were often fitted with the cheapest flex duct available. Over 15 to 30 years, the connections at metal collars loosen and conditioned air leaks into the attic. This is the single most common problem we find in homes along Windward Parkway and throughout the Crabapple area.
• Leaky return ducts near kitchens pulling grease vapor. In master-planned communities like Windward, many homes have return ducts placed near kitchens. Grease-laden air gets pulled into the return side, coats duct interiors, and accelerates sealant degradation. This is a localized Alpharetta problem we see far more often here than in Roswell or Milton.
• Construction debris left in ducts from original build. New and newer Alpharetta homes frequently have drywall dust, sawdust, and even scraps of flex duct left in the system from construction. Builders rarely clean ducts at handover. That debris gets trapped in the system and blows into living spaces for months, sometimes years, after move-in.
• Summer condensation rotting unsealed seams. Alpharetta’s humid summers push moist air into attics. Unsealed duct seams soak up that moisture, insulation inside the duct liner breaks down, and airflow drops. Finished basements and upstairs bedrooms suffer most because they depend on the longest duct runs in the house.

Pricing for Duct Sealing in Alpharetta, GA

We Also Serve Cities Near Alpharetta

Our crews serve the wider North Fulton and South Forsyth area. If you’re in Alpharetta or nearby Roswell, Duluth, Cumming, or Canton, we can schedule duct sealing at your home with the same written pricing and 365-Day Done Right Promise. Dispatch is coordinated from our Atlanta office, and Alpharetta is a core service area for us.

FAQs About Duct Sealing in Alpharetta