Seal the ducts, keep the air you paid for
Typical DFW duct systems leak a fifth of their air into the attic. Sealing is the least glamorous, highest-return fix in residential HVAC, and it’s permanent.
The straight version
Every joint, boot, and plenum connection in a duct system is a potential leak, and in most homes a good number of them are leaking right now: air you paid to cool spilling into a 130-degree attic on the supply side, and hot dusty attic air being pulled into the system on the return side. Industry measurements put typical leakage around 20 percent. Imagine paying every fifth cooling dollar to condition the attic and you have the picture.
Sealing is methodical work: every accessible connection gets mastic, the boots where ducts meet ceilings get sealed to the drywall, plenum seams get closed, and the return side gets equal attention because leaks there feed unfiltered attic air into your blower, coil, and lungs. Done once and done right, sealing holds for the life of the ductwork.
North Texas is hard on equipment in both directions: cooling seasons that run April to October with attics past 140 degrees, then winter fronts that drop thirty degrees in an afternoon. Every recommendation on this page is made against that reality, sizing, maintenance intervals, and the repair-or-replace math included. Equipment that gets honest seasonal attention handles it; neglected equipment picks the worst week of the year to quit.
What sealing addresses
- Supply joints leaking conditioned air
- Return leaks pulling attic air and dust inward
- Boot-to-drywall gaps at every register
- Plenum and cabinet seam leakage
- Tape-only joints re-sealed with mastic
- Verified static improvement after sealing
Related ductwork work we handle: Duct Installation Services · Duct Repair Services · Duct Replacement Services · Airflow Balancing Services · the full catalog.
How we approach it
Return-side leaks are the health story nobody tells: they bypass your filter entirely, feeding attic dust, insulation fiber, and summer humidity straight into the airstream. If your house is dusty no matter how good the filter is, the filter probably isn’t the problem. The return path is.
Ductwork is the half of the system nobody sees and most companies skip. A typical North Texas attic run leaks a fifth of its conditioned air before it reaches a register, and no equipment upgrade can outrun ducts that were never sealed, sized, or supported properly. Every duct recommendation here comes from an attic walk and static pressure readings, because bolting new equipment onto tired ducts wastes half of what you paid for it.
Financing through Synchrony and Wisetek is there when the timing is hard, and the emergency line reaches a real person 24/7. Serving Midlothian and the four-county southern DFW footprint: Ellis, Johnson, Dallas, and Tarrant counties. See finished work in the gallery.
How the call goes
- Describe the symptoms on the phone. Half the time you’ll get a preliminary read before the truck ever rolls.
- On site, the diagnosis comes from gauges and meters, not hunches, and you see the failed part rather than hear about it.
- The price is firm before work begins. After-hours emergency terms get stated plainly up front.
- When the job wraps, the system gets verified under load and you get the findings in plain language.
A note on parts and warranties: repairs use parts matched to the manufacturer’s specification, not whatever is cheapest on the shelf, and the paperwork you get names what went in. Where the equipment is still under a manufacturer’s parts warranty, we tell you, because plenty of homeowners pay full freight for parts their registration already covers. That one sentence has saved 2L customers real money over the years, and it is exactly the kind of thing a commissioned salesman is paid to forget to mention.
Duct Sealing Services, plainly answered
Something more specific going on? Call (214) 717-3959 and describe it. You’ll talk to the owner, not a call center.
How much energy does duct sealing actually save?
Typical DFW systems leak 15-25 percent, and sealing recovers most of it. On a Texas cooling bill that’s real annual money, and unlike equipment, sealing doesn’t wear out or lose efficiency over time.
How is sealing done, tape or something better?
Mastic, the brush-on compound that cures permanent and flexible, plus proper collars and mechanical fastening where joints need rebuilding. The cloth duct tape that named itself after this job fails in attic heat within a few years, which is why so much of it is hanging loose up there now.
Will sealing help my dust problem?
If return leaks are pulling attic air past your filter, dramatically. It’s one of the most common causes of the endless-dust complaint, and sealing closes the bypass at the source.
How long does duct sealing take?
Usually one day for a typical home. No walls opened, no mess in the living space, just methodical attic work and a measurable difference when the blower kicks on that evening.
Is duct sealing worth it if my system is older?
Often more so, older systems leak more, and sealing extends the equipment’s effective capacity. It also means whatever new system you eventually buy starts life on a tight duct network instead of inheriting the leaks.
Where we do this work: Midlothian and the whole southern DFW footprint, Ellis County (Waxahachie, Red Oak, Ennis, Ferris, Ovilla, Maypearl, Palmer, Italy, Milford) · Johnson County (Burleson, Cleburne, Joshua, Alvarado, Venus, Godley, Keene, Rio Vista, Grandview) · Dallas County (Dallas, Cedar Hill, DeSoto, Duncanville, Lancaster, Wilmer, Hutchins, Balch Springs) · Tarrant County (Fort Worth, Arlington, Mansfield, Kennedale, Forest Hill, Crowley, Everman, Benbrook). Every community links to its own local page from the service-areas map.
Twenty years on the tools, and the sales desk never got built.
Book a Service Call