Air Conditioning & Heating · Dallas–Fort Worth, TX
Duct Sealing, Repair & Cleaning in Dallas–Fort Worth
Your ducts run through a 130°F attic carrying the air you paid to cool. If they leak — and most do — sealing them beats buying a bigger AC.
- Licensed & insured
- Upfront flat-rate pricing
- Same-day appointments
Quick answer
The typical DFW home leaks 20–30% of its conditioned air through duct joints, disconnections and porous runs in the attic. Plumber Service TX pressure-tests duct systems to measure actual leakage, seals and repairs what the test finds, corrects undersized returns and crushed runs, and cleans ducts when inspection shows genuine contamination — with before/after numbers, not promises.
The Invisible Bill: What Duct Leakage Costs in This Climate
Every supply-side leak dumps air you paid to cool into a 130°F attic; every return-side leak sucks that attic air — hot, dusty, insulation-laden — into your system and your lungs. At the DFW-typical 20–30% leakage rate, a homeowner paying $300 summer electric bills is donating $60–90 a month to the attic, while the AC runs longer hours to compensate, aging faster. Return leaks additionally explain a raft of ‘mystery’ complaints: dust that returns overnight, musty smells at startup, allergies that worsen indoors.
The perverse part: leaky ducts make replacement ACs disappoint. A new 17-SEER2 system breathing through 25% leakage performs like builder-grade — which is why we test ducts before quoting equipment upgrades, and why sealing is often the cheaper half of the comfort fix.
Test, Seal, Verify — Numbers at Every Step
Pressure test
A duct blaster measures your system’s actual leakage as a number — the baseline that makes everything after it honest.
Inspect and map
Attic crawl with camera documentation: disconnected runs (shockingly common), failed tape joints, crushed flex, unsealed boots and plenum gaps.
Seal and repair
Mastic and proper mechanical fastening at every joint — not the cloth ‘duct tape’ that ironically fails on ducts within a few years. Crushed and undersized runs corrected, boots sealed to drywall.
Re-test and report
The same measurement after the work, in writing: leakage before, leakage after. If we didn’t move the number, you’d know — ours routinely cut leakage by half or more.
Duct Cleaning: When It’s Real and When It’s a Coupon Scam
Duct cleaning is legitimate in specific cases: visible mold or biological growth, post-renovation drywall dust loads, pest intrusion, or years of filter bypass matting the duct interior. It is not the $59-coupon cure-all the postcard industry sells — and cleaning leaky ducts without sealing them is washing a car with the windows down. Our rule: we camera-inspect first and show you the interior footage; if your ducts are clean, we say so, and if they’re contaminated, cleaning is quoted alongside the sealing that keeps them that way. Cleaning without a shown reason is a red flag — from anyone, including us.
Related Air Conditioning & Heating Services
AC Repair & Maintenance
Fast air conditioning repair and tune-ups that keep Texas summers survivable.
View service →AC Installation & Replacement
Right-sized, high-efficiency AC systems installed to manufacturer spec.
View service →AC Lifetime Warranty
Qualifying new systems backed by our lifetime workmanship warranty program.
View service →AC Filter Replacement
Correct filters, on schedule — protecting airflow, coils and air quality.
View service →Thermostats
Smart and programmable thermostats installed, wired and configured properly.
View service →Evaporator Coils
Frozen, leaking or corroded evaporator coils diagnosed and replaced.
View service →Serving the Dallas–Fort Worth Metroplex
Our dispatch teams in Fort Worth, Frisco and Southlake cover both sides of the metroplex, so a technician is never far away.
- Arlington, TX
- Fort Worth, TX
- Frisco, TX
- Southlake, TX
- Dallas, TX
- Plano, TX
- Irving, TX
- Grapevine, TX
Duct Cleaning & Sealing — Frequently Asked Questions
How do I know if my ducts leak?
Strong tells: rooms that never match the thermostat, a system running long hours for modest cooling, dust that returns within a day, musty startup smells, and summer bills outpacing neighbors with similar homes. The definitive answer is a duct pressure test — a measured leakage number, not an opinion.
How much does duct sealing cost, and what’s the payback?
It scales with system size and attic access, quoted flat-rate after the pressure test. At DFW cooling costs, homes starting at 25%+ leakage commonly see payback in two to four summers — before counting comfort, dust and system-lifespan benefits. The before/after test numbers come with the invoice.
Is duct cleaning worth it?
When inspection shows real contamination — mold, renovation dust, pest evidence, years of filter bypass — yes. As a routine annual service or coupon special, no. We camera-inspect and show you the footage first; if the ducts are clean, that’s what we tell you.
Why is one room always hotter than the rest of the house?
Usually a duct-branch problem: a crushed or kinked flex run, a disconnected duct quietly cooling the attic, an undersized branch, or a missing damper balance. Occasionally it’s the room’s envelope (west windows, thin insulation). Our airflow measurement at each register finds which.
What is ‘aeroseal’ or sealing ducts from the inside?
Aerosolized sealant blown through the system that accumulates at leak edges — effective for the small, scattered leaks hand-sealing can’t reach, and we recommend it where geometry justifies it. Larger defects (disconnections, torn flex) still need physical repair first; the technologies are complements, not rivals.
Can leaky return ducts really affect health?
They’re a genuine air-quality pathway: return leaks in the attic pull in air laden with insulation fibers, dust and whatever else lives up there, bypassing your filter’s intent. Allergy improvements after return-side sealing are one of the most consistent things customers report.
Should I seal ducts before replacing my AC?
Test them, always — it changes the equipment decision. Sealed ducts sometimes allow a smaller, cheaper system; unsealed ones strangle a premium one. We test as part of every replacement quote, and sealing quoted alongside often costs less than the efficiency-tier jump it outperforms.
How long does duct sealing take?
Most homes complete in a day: test, seal, repair, re-test. Extensive repairs or difficult attics can extend it; the quote sets the expectation, and the re-test number proves the work regardless of duration.
Need duct cleaning & sealing in DFW today?
Email service@plumberservicetx.com and our dispatch team will confirm your same-day or next-day appointment window.