Southlake & Northeast Tarrant
Duct Sealing
Sealing gaps, loose joints, and leaks in your HVAC ductwork so conditioned air reaches its intended rooms instead of leaking into attics, wall cavities, or crawlspaces.
- NADCA-Trained Techs
- 10+ Years Local
- Satisfaction Guaranteed
Where the Conditioned Air Goes
Why Leaky Ducts Cost More Than They Should
Ductwork moves conditioned air from the HVAC system to every room in the house, and every gap, loose joint, or disconnected seam along the way is air that never makes it where it's supposed to go. In a lot of homes that means one or two rooms that never quite feel as cool or as warm as the rest of the house, no matter how the thermostat is set.
Attic-run ductwork is especially common in this area's newer two-story construction, where supply trunks and branch lines travel through hot attic space above the living area. North Texas attics run extremely hot for months during summer, and a leaking seam up there pulls hot attic air into the duct system on the return side while pushing conditioned air out on the supply side, both of which make the AC work harder for a worse result.
The usual culprits are seams sealed with ordinary cloth duct tape that has dried out and lost its bond, connections that were never fully seated during original installation, and joints that have separated slightly as the house has settled. None of these show up from inside the living space; they only show up as uneven temperatures, higher energy use, or dust infiltration around registers.
Sealing is a distinct service from duct cleaning, and the two are often done together, since a technician already inside the ductwork for a residential air duct cleaning visit is well positioned to spot and seal leaks at the same time. If cleaning turns up sealing issues, we'll flag them and give a separate quote before doing any sealing work. For the dryer exhaust line specifically, sealing does not apply the same way; that duct is addressed through dryer vent cleaning or installation instead, since it's a different system entirely.
Leaks aren't only a problem in older homes. Newer construction can have loose connections right from the original installation, particularly at the plenum where multiple branch lines join the main trunk, since that's where the most connections come together in the smallest space. Attic work done for other reasons, such as adding insulation or running new wiring, can also nudge a duct loose that was previously sealed tight, which is why a periodic check is worth doing even in a home that has never had a duct problem before.
Scope of the Job
What Duct Sealing Involves
-
Leak Detection
We check accessible duct runs, especially attic and crawlspace sections, for separated joints, gaps at connections, and deteriorated tape or mastic.
-
Mastic Sealant Application
Leaks are sealed with duct mastic or foil tape rated for HVAC use, not ordinary cloth tape, which loses its bond with heat and time.
-
Joint and Connection Resecuring
Loose or partially seated connections are refastened before sealing, so the joint itself is sound and not just covered over.
-
Register and Boot Sealing
Where ducts meet floor or ceiling registers, the boot connection is checked and sealed, since that junction is a common leak point.
-
Attic Run Priority
Attic-run ductwork gets particular attention, given how much conditioned air and energy a leak up there wastes during peak summer AC use.
-
10+
Years working on ductwork for Southlake-area homes
-
100%
Satisfaction guarantee on every visit
-
NADCA
Trained cleaning standards
Start To Finish
How a Sealing Visit Works
Four steps from inspection to verification, so you see what was leaking and what was done about it.
Request a Callback-
Inspection
We check accessible duct runs and connections for gaps, separated joints, and deteriorated seals.
-
Leak Assessment
We show you what we found and explain which leaks matter most for comfort and efficiency.
-
Sealing Work
Leaks are sealed with mastic or foil tape rated for ductwork, and loose connections are resecured first.
-
Verification
We check the sealed sections and give you a summary of what was addressed.
Proof, Not Promises
Sealing Work in the Field
Duct mastic going onto a joint in an attic supply run.
A newly sealed connection next to a deteriorated one on the same run.
Inspecting ductwork in the attic space above a two-story home.
Before You Book
Common Questions
How do I know if my ducts need sealing?
Rooms that stay noticeably warmer or cooler than the rest of the house, higher than expected energy bills, or dust blowing around registers even after cleaning are common signs. We can check the accessible runs and tell you plainly whether leaks are the cause.
Does duct sealing really make a difference in energy use?
Sealed ductwork keeps conditioned air moving to the rooms it was designed to reach instead of leaking into an attic or wall cavity, which matters most during the months when the AC runs heavily. The exact difference depends on how leaky the system was to start.
Is duct sealing the same as duct cleaning?
No. Cleaning removes dust and debris from inside the ducts; sealing closes physical gaps and leaks at joints and connections. They address different problems, though we often check for both during the same visit.
How much does duct sealing cost?
It depends on how much of the run is accessible and how many leaks are found. We give an upfront quote once we've inspected the ductwork, so you know the price before any sealing work starts.
Can duct sealing be done in an attic during summer?
Yes, though attic work is scheduled around the heat for the technician's safety and comfort, since North Texas attics get extremely hot during peak summer months. We plan visits accordingly.
Will sealing my ducts fix a room that never gets cool enough?
If a leaking duct is feeding that room short, sealing can meaningfully improve it. If the issue is instead undersized ductwork or an equipment problem, sealing alone will not fully solve it, and we'll tell you which situation applies once we've inspected the run.
Southlake & Northeast Tarrant
Noticing Uneven Temperatures Room to Room?
Tell us which rooms feel off and we'll check the ductwork feeding them for the leaks that are usually behind it.
- NADCA-Trained Technicians
- 10+ Years Local
- 100% Satisfaction Guarantee
Serving Southlake
Local Air Duct Services provides fast, same-day garage door repair, installation, and service across Southlake and the surrounding Orange County communities. Licensed, bonded, and insured, with technicians who call ahead.