Whole-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.
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AfterFast, Reliable Duct Sealing Across Addison
We seal ducts in Addison’s condos, townhomes, and mid-rise buildings where most residents live, not in sprawling single-family attics. Our crews dispatch from the Dallas-Fort Worth office and carry the chase-access tools needed for vertical shared duct runs. If your unit was built between the 1970s and 2000s, there’s a fair chance the original flexible ductwork behind your walls is crushed, disconnected, or leaking into the cavity. Call (361) 326-5060 for a free estimate. We’ll camera-inspect the run, show you what we find, and give you a written price before any work starts.
Why Hollis Air Duct Cleaning Is Addison’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Duct Sealing team knows the difference between a standard attic job and the chase-access work Addison buildings demand. Our technicians are background-checked, uniformed, and expected to arrive inside the quoted window, price in writing, and leave the site clean. That’s The Garrison Standard.
Every repair we perform in Addison is backed by our 365-Day Done Right Promise in writing. If the seal fails within a year, we return and make it right at no charge, including a free second visit. No negotiation, no runaround.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday to schedule your chase inspection.
We serve Addison specifically, and we understand the HOA coordination, access-panel protocols, and multi-unit shutoff procedures that come with sealing shared ductwork in buildings along Belt Line Road and the Dallas North Tollway corridor.
HVAC Duct Sealing in Addison
HVAC Duct Sealing in Addison is typically a chase-access job, not a crawl-through-the-attic job, because most residents live in apartments, condos, and townhomes built between the 1970s and 2000s with compact vertical duct runs shared between units. The work involves locating leaks at joints, collars, and seams; cleaning and drying the surface; then applying duct sealing mastic or reinforced tape to create a permanent seal. We camera-inspect first so you see the problem before we cut any access panel. A typical residential duct sealing job in Addison runs $450 – $950 depending on how many runs are involved and whether HOA coordination requires a second visit for access.
Shared Chase Access
Vertical chases in Addison’s older condo stacks often contain the original flexible ductwork from the 1980s or 1990s. One crushed run can starve several units of airflow. We locate the failure with a borescope, coordinate with your HOA or building manager for panel access, and restore the run without tearing up finished walls unnecessarily.
Mold-Resistant Sealing
Addison’s humid subtropical climate means air conditioning runs hard from May to October, driving condensation inside ductwork. We clean and dry every joint before sealing. Mastic applied over a wet or moldy surface will fail by the next cooling season. We do it once, and we do it dry.
Duct Repair in Addison
Duct Repair in Addison often means reconnecting collars, replacing crushed flexible runs, or patching holes in the chase walls that separate conditioned air from wall cavities. The original ductwork in buildings from the 1970s through the 1990s was not designed for forty years of continuous use. We find disconnected registers, split seams, and runs that have pulled completely free of the air handler. A typical duct repair in Addison runs $350 – $800 for collar reconnection and patching; full run replacement in a shared chase can reach $1,200 – $1,800 depending on HOA access requirements and material length.
Collar Reconnection
Disconnected collars at supply registers and the air handler are silent energy thieves. Your AC runs longer, your bills climb, and the unit above or below you may be getting your conditioned air. We reconnect with mechanical fasteners and seal with mastic, then test airflow at the handler to confirm the fix before we close the chase.
Crushed Run Replacement
Flexible duct crushed flat where it passes chase framing cannot be restored. We replace with properly sized, insulated flex duct, support it to prevent re-crushing, and seal every joint. The new run carries its rated airflow, and your system stops working overtime.
Trusted Brands We Service in Addison
Our equipment roster includes Rotobrush rotary brush systems for mechanical cleaning inside duct runs, Nikro negative-air machines for containment during chase access work, and sealing products from Abatement Technologies and Guardsman. We stock common collar sizes, mastic compounds, and flexible duct diameters so most Addison repairs don’t wait on parts. When your building manager needs the job done inside a narrow maintenance window, that local inventory matters.
Common Duct Sealing Problems We See in Addison Homes
- Crushed flexible runs in shared vertical chases. Original 1980s – 90s ductwork was often compressed where it passed framing members in the chase. One flattened run can reduce airflow to three or four stacked units, and the damage is invisible until we run a camera.
- Disconnected collars dumping air into wall cavities. In townhome and condo systems along Belt Line Road, we regularly find supply collars that have pulled free of the register boot or the air handler plenum. The unit runs, the meter spins, and the room stays warm.
- Condensation-driven mold at poorly sealed joints. Addison’s May-to-October cooling season keeps ducts cold and humid. Any gap in the seal lets warm attic or chase air meet cold duct surface, and mold follows. We clean before we seal, every time.
- Original mastic dried and cracked after decades of thermal cycling. The seal that held in 1985 is dust by now. We remove the old material, prep the surface, and apply fresh compound rated for the temperature swings of a Texas HVAC system.
Pricing for Duct Sealing in Addison, TX
In Addison’s market, a straightforward single-run seal in an accessible location typically runs $450 – $650. Multi-run sealing in a shared chase with HOA coordination usually falls between $750 – $950. Full duct repair with crushed run replacement and collar reconnection ranges $350 – $800 for localized work, or $1,200 – $1,800 when we’re replacing multiple runs in a vertical stack. What moves the price: how many runs are involved, whether we need a return visit for HOA-approved access, and the condition of the original ductwork. We give you one flat price per system, agreed in writing, before any work starts. No per-vent pricing, no add-ons at the door. Call (361) 326-5060 for a free estimate. We’ll inspect with a camera, show you the footage, and quote the exact scope.
We Also Serve Cities Near Addison
Our crews work throughout the northern Dallas suburbs. We also provide duct sealing and repair in Carrollton, Richardson, Coppell, and Plano. Each job carries the same written price guarantee and 365-Day Done Right Promise.
Serving Addison, TX - Our Local Coverage Area
We’re based in the Addison 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 Addison
Yes, in most cases we access the ductwork through existing chase panels or small, precisely cut openings that your HOA or building manager approves in advance. We camera-locate the leak first, so we know exactly where to open and how big the access needs to be. Call (361) 326-5060 to schedule a borescope inspection and written quote.
Because cleaning the inside of a duct does not fix a crushed run or disconnected collar that’s blocking or diverting airflow. In Addison’s shared vertical systems, we often find that the duct is clean but structurally compromised behind the wall. Sealing or repair is the fix, not another cleaning. Call (361) 326-5060 and we’ll run a camera to confirm.
Yes. Addison’s humid subtropical climate means ducts stay cold and wet for six months of the year, which drives mold growth at any gap in the seal and re-wets mastic that was applied over a damp surface. We dry every joint thoroughly before sealing, and we use compounds rated for high-humidity HVAC environments. Call (361) 326-5060 if you suspect moisture damage in your chase.
Your HOA or building management company approves access to shared chases, and we coordinate directly with them for panel locations, shutoff times, and insurance documentation. We carry the background-check verification and written protocols that most Addison property managers require. Call (361) 326-5060 and we’ll walk you through the approval process.
We test static pressure and airflow at the air handler before we close any access panel, and we show you the before-and-after readings. If the numbers don’t meet spec, we don’t button up the chase. Our 365-Day Done Right Promise covers the seal for a full year; if it fails, we return at no charge. Call (361) 326-5060 to book a sealed, verified repair.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Addison since 2004.