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 Flower Mound
Duct sealing in Flower Mound typically runs $400 – $900 per HVAC system depending on accessibility and the condition of the existing ductwork, and most jobs are scheduled within a few business days after your call. We’re the Duct Sealing crew serving Flower Mound from our Dallas-Fort Worth office, and we know the local housing stock well enough to price it honestly before we step inside. Call (361) 326-5060 for a free estimate.
Flower Mound isn’t a starter-home market. The homes here are large, often custom or semi-custom, built between the 1980s and 2010s in master-planned communities like Bridlewood, Wellington, and The Lakes. Most run two or three separate HVAC systems with long flex-duct runs through attics that hit 140°F+ in July and August. That combination, specific to this suburb, is why we price and scope duct sealing per system, not with a vague “whole house” number that falls apart once we’re in your attic.
Why Hollis Air Duct Cleaning Is Flower Mound’s Preferred Duct Sealing Company
We’ve been in business since 2004 as part of the Garrison Partners family, and our Dallas-Fort Worth office dispatches crews to Flower Mound regularly. The Garrison Standard means we arrive inside the quoted window, put the price in writing before any work starts, and leave the site clean. No price jumps at the door. No callbacks that go to voicemail.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Every duct sealing job carries our 365-Day Done Right Promise in writing: if the seal fails or the comfort problem returns within a year, we come back and make it right at no charge, including a free second visit.
Phones are answered by a live person 24 hours a day, 7 days a week. No callback queues, no waiting until Monday.
We use professional-grade equipment from Nikro, Honeywell, and Aprilaire, the same tools commercial crews use, and we explain what each piece does for your specific system before we start.
Duct Repair in Flower Mound
Duct Repair in Flower Mound usually means fixing disconnected, crushed, or degraded flex-duct runs in the sprawling attics of 3,000 – 6,000+ sq ft homes, and it typically costs $250 – $600 per repair depending on accessibility and whether the plenum connection has separated. The housing stock here, built from the 1980s through the 2010s, used builder-grade R-4 or R-6 flex duct that degrades faster in Flower Mound’s extreme attic heat than in cooler climates. We don’t guess at the problem; we camera-inspect the trunk lines and plenum connections first.
Collapsed Flex Duct in Attics
In Flower Mound’s Bridlewood and Wellington neighborhoods, we regularly find original flex duct from the 1990s that has collapsed under its own weight or torn at the plenum joint. The conditioned air never reaches the living space; it dumps into the attic instead. We re-hang the run with proper support straps, reconnect at the plenum, and seal with mastic rated for high-temperature applications.
Pressure Imbalance Between Zones
When one floor or wing of your Flower Mound home runs 6 – 10°F different from the rest, the cause is often a crushed or disconnected trunk line feeding that entire zone, not a thermostat problem. We pressure-test each zone independently to isolate the leak before any repair begins.
Air Duct Sealing in Flower Mound
Air Duct Sealing in Flower Mound addresses the leaks, gaps, and degraded mastic joints that waste conditioned air in homes with multiple HVAC systems and long duct runs through unconditioned attic space, and it typically runs $400 – $900 per system depending on the number of joints and the condition of the existing ductwork. Sealing is not a cosmetic service; it’s a measured, tested procedure that should show a verified reduction in duct leakage when done correctly.
Mastic Sealing at Plenum and Trunk Joints
We apply duct sealing mastic, a thick, fiber-reinforced compound, to every joint and seam in the accessible ductwork. In Flower Mound’s 140°F+ attics, cheap tape fails within a season. Mastic remains flexible and bonded. We access the plenum, trunk lines, and branch connections, not just the easy spots near the air handler.
Post-Seal Verification Testing
After sealing, we run a blower-door or duct-blaster test to document the reduction in leakage. You get the before and after numbers in writing. In a Flower Mound home with two or three systems, we test each independently. A partial seal on one system while the others leak is a failed job by our standard.
Trusted Brands We Service in Flower Mound
We stock parts and filtration products from Honeywell, Aprilaire, and Abatement Technologies for Flower Mound customers, which means faster turnaround on jobs that need replacement components rather than waiting on a parts order. Our equipment roster includes Nikro negative-air machines and Rotobrush rotary brush systems for jobs where sealing follows cleaning. We don’t show up with hardware-store gear and hope it works. Every tool we carry is rated for the commercial and residential work we do in North Texas, and we’ll tell you exactly which piece we’re using on your system and why.
Common Duct Sealing Problems We See in Flower Mound Homes
- Builder-grade flex duct baked brittle in 140°F+ attics. The R-4 and R-6 flex installed in Flower Mound’s 1980s – 2010s homes degrades faster than in cooler markets. The outer jacket cracks, the insulation compresses, and the inner liner tears at bends and supports.
- Mastic joints at the plenum fail from thermal cycling. Every summer day in Flower Mound, attic ductwork expands in the heat and contracts overnight. That cycling cracks mastic that was thinly applied or improperly cured, opening gaps that leak conditioned air directly into the attic.
- Disconnected trunk lines in deep blown-in insulation. In The Lakes and similar neighborhoods, attics with 12 – 18 inches of blown fiberglass hide ductwork that has separated at couplings. Homeowners feel “weak airflow” and blame the wrong system; the real problem is a trunk line returning air to the attic instead of the bedroom.
- Partial seals that ignore secondary systems. With two or three HVAC systems common in Flower Mound homes, sealing only the air handler in the most accessible attic space leaves the other zones leaking. We scope and seal every system, or we tell you upfront which ones need it and which don’t.
Pricing for Duct Sealing in Flower Mound, TX
Duct sealing in Flower Mound runs $400 – $900 per HVAC system. A typical two-system home in Bridlewood or Wellington falls in the $800 – $1,800 range. A three-system home in The Lakes can run $1,200 – $2,700. The price depends on how many systems you have, how accessible the attic is, whether we’re re-hanging collapsed flex duct before sealing, and whether the plenum connections have separated and need reconstruction.
We do not quote per-vent prices. That model invites bait-and-switch: a low teaser rate that balloons once the technician counts every branch line. We price per system, inspect every trunk line and plenum connection, and give you one written price before any work starts. The price does not move at the door.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Flower Mound
Our crews also handle Duct Sealing in Flower Mound and surrounding areas including Roanoke, Southlake, Argyle, and Grapevine. Each community has its own housing stock and ductwork patterns; we adjust our scope and pricing to match what we find, not what we assume.
Serving Flower Mound, TX - Our Local Coverage Area
We’re based in the Flower Mound 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 Flower Mound
Because most Flower Mound homes between 3,000 and 6,000+ sq ft run two to three separate HVAC systems, each with its own air handler, plenum, and trunk lines that must be leak-tested and sealed independently. A “whole house” flat rate would either overcharge you for a small system or under-scope a large one. Per-system pricing is the only honest model for this market. Call (361) 326-5060 and we’ll count your systems during the free estimate.
Probably, but it needs inspection to confirm. In The Lakes we commonly find crushed or disconnected flex-duct runs in the attic feeding the upstairs zone, or a plenum joint that has separated and dumps conditioned air into the insulation. The 2000s build date doesn’t protect against Flower Mound’s attic heat or work-from-home usage patterns that run systems 24/7. We camera-inspect first, then quote the repair or seal needed.
We work around existing insulation whenever possible, but we won’t seal what we can’t see or reach. In Flower Mound homes with deep blown-in fiberglass, that sometimes means moving insulation to access plenum connections, then replacing it. We leave the site clean, including insulation repositioned, not scattered. If your attic has spray foam or board insulation, access is different and we’ll explain the approach before quoting.
You get a written invoice with the scope of work per system, the before-and-after leakage test results, and the 365-Day Done Right Promise in writing. If we ran a blower-door or duct-blaster test, those numbers are on the report. Photos of accessed plenum joints and sealed connections are available on request. Documentation matters when you can’t see the work yourself.
Yes. Our procedures align with NADCA ACR standards for assessment, cleaning, and restoration of HVAC systems, including post-work verification testing. We don’t treat “NADCA” as a sticker; we follow the standard because it produces measurable results that we can document and guarantee. Ask us to walk you through the specific NADCA steps we apply to your system before we start.
Ready to stop losing conditioned air to your attic? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate on duct sealing in Flower Mound. We’ll inspect every system, put the price in writing before any work starts, and back it with our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Flower Mound since 2004.