Duct Sealing in Dunwoody - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Dunwoody

Duct sealing in Dunwoody typically runs $800 – $2,400 for a whole-home system, and most jobs are scheduled within a few business days after your call. If you’re living in Dunwoody North, Village Mill, or near Perimeter Center and your utility bills keep climbing while rooms stay unevenly heated or cooled, the problem is likely leaking ductwork in your attic or crawl space.

Call (361) 326-5060

We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and we’ve been working on Dunwoody’s specific housing stock long enough to know what fails here. Dispatch and scheduling are coordinated from our Atlanta office, but our crews serve Dunwoody directly and understand the local building codes that affect sealing work, especially when a home sale or renovation is involved. You can reach us at (361) 326-5060 to book a free estimate, and you’ll speak to a live person, not a voicemail loop.

Why Hollis Air Duct Cleaning Is Dunwoody’s Preferred Duct Sealing Company

Dunwoody homeowners have a particular reason to be cautious about who they let into their attics. Many of these homes were built during the 1960s through 1980s housing boom, and the original ductwork was never properly sealed at the plenum or register boots. We’ve earned repeat calls here because we document our work with before-and-after photos and written reports that satisfy real estate inspectors and city code reviewers.

Our technicians are background-checked and uniformed, and they arrive inside the quoted window. The price is written down before any work starts, and it does not move at the door. That’s The Garrison Standard, and it applies to every Duct Sealing in Dunwoody job we take on.

The 365-Day Done Right Promise backs every repair: if the seal fails or the problem returns within a year, we come back and make it right at no charge, including a free second visit. No negotiation, no runaround.

Calls are answered by a live person 24 hours a day, 7 days a week. When you’re staring at a home inspection report that flags duct leakage before closing, you don’t want to wait until Monday for answers.

HVAC Duct Sealing in Dunwoody

HVAC Duct Sealing in Dunwoody addresses the specific failure pattern of original galvanized or flex duct runs that were installed without mastic or mechanical sealing at the joints. In neighborhoods like Dunwoody North and Village Mill, these systems have spent forty to sixty years pulling unconditioned attic air through gaps at the air handler plenum, register boots, and trunk-line connections. The result is uneven temperatures, excess humidity, and utility bills that climb every summer as your AC works harder to compensate for air lost into the attic.

A typical whole-home HVAC duct sealing job in Dunwoody runs $800 – $2,400 depending on system size, attic accessibility, and whether source removal is needed first. Homes with original 1970s ductwork often need both: the debris removed, then the leaks sealed. We price this as one flat fee per system, agreed in writing before we start.

Source Removal Before Sealing

Sealing a dirty duct system traps pollen, rodent nesting material, and construction dust against your air handler. We use Rotobrush rotary brush systems and Nikro negative-air machines to clean the supply and return lines first, with HEPA filtration running continuously so nothing recirculates into your living space.

Mastic and Mesh Sealing Method

We seal joints with water-based duct mastic reinforced with fiberglass mesh, not tape. Tape dries and fails in Dunwoody’s hot attics; mastic remains flexible and is the method specified by ASHRAE and most local inspectors. We photograph every sealed joint for your documentation file.

Duct Repair in Dunwoody

Duct Repair in Dunwoody often goes hand-in-hand with sealing because the same decades of thermal cycling that opened gaps have also cracked flex duct, crushed sections underfoot during HVAC service calls, or created disconnections where squirrels have chewed through. In Dunwoody’s mature neighborhoods, we regularly find original galvanized trunk lines that have separated at joints after fifty years of expansion and contraction through Atlanta’s humid summers and mild, wet winters.

Repair costs in Dunwoody typically fall between $400 and $1,200 for section replacement or reconnection, with whole-system repairs ranging higher if multiple trunk lines need replacement. We inspect with duct cameras before quoting, so you know exactly what failed and why.

Flex Duct Replacement

Original flex duct in Dunwoody attics becomes brittle and sags, creating low spots where condensation pools and mold grows. We replace compromised runs with properly supported, insulated flex duct and seal all connections with mastic.

Galvanized Trunk Line Repair

When original metal trunk lines separate at seams, we can often repair with custom sheet metal patches and collar connections, preserving the original infrastructure while restoring airtight integrity. This saves money over full replacement when the metal itself is sound.

Trusted Brands We Service in Dunwoody

Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation inside duct walls, Nikro negative-air machines that maintain suction during cleaning and sealing, and filtration products from Honeywell, Aprilaire, and Guardsman. For Dunwoody homeowners dealing with the fine pollen load from our heavy tree canopy, we stock Guardsman media filters and can recommend appropriate upgrades after sealing is complete. We carry common repair parts for duct systems found in local homes, which means most repairs don’t require a return trip.

Common Duct Sealing Problems We See in Dunwoody Homes

• Original unsealed plenum and boot gaps. In Dunwoody North and Village Mill, the attic chase acts like a filter for tree pollen and squirrel debris because the original installers never sealed where the air handler meets the plenum or where ducts terminate at register boots. Your system pulls attic air directly into the return, bypassing the filter entirely.
• Thermal cycling separation in galvanized trunks. Decades of expansion and contraction through Atlanta’s long, hot summers have opened seams in original metal ductwork that tape and DIY fixes cannot hold. The leaks worsen each year as the metal fatigues.
• Pest intrusion in unscreened vents. Every fall, we get calls from North Springs and Wynterhall homeowners who find leaves, acorns, and rodent nesting material in flex runs after squirrels and birds exploited unscreened attic vents. Sealing without camera inspection can trap pests inside.
• Post-construction dust loading. Dunwoody’s renovation activity, especially near Perimeter Center, fills ducts with fine drywall and sawdust particles. Sealing over this debris without source removal first creates a reservoir that feeds your air handler for years.

Pricing for Duct Sealing in Dunwoody, GA

We Also Serve Cities Near Dunwoody

Our Duct Sealing crews also work in Atlanta, South Fulton, Sandy Springs, and Roswell. The same written pricing, same 365-Day Done Right Promise, same background-checked technicians apply across the metro area.

FAQs About Duct Sealing in Dunwoody