Ductwork Repair & Sealing in Dallas
The average DFW home loses 25–35% of conditioned air through duct leaks. That's like running your AC with a window open. Most of the leakage happens in unconditioned attics where summer temperatures hit 140°F+. Sealing or replacing those ducts is one of the highest-ROI improvements you can make.
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Ductwork Service Costs in Dallas
| Service | Dallas Cost |
|---|---|
| Duct Inspection / Pressure Test | $100–$300 |
| Duct Sealing (Aeroseal or manual) | $400–$1,500 |
| Duct Repair (per section) | $200–$800 |
| Duct Insulation (R-6 to R-8) | $500–$2,000 |
| Full Ductwork Replacement | $2,500–$7,000 |
| Add New Duct Run | $300–$1,500 |
| Duct Cleaning | $300–$500 |
DFW's Ductwork Problem
Almost every DFW home runs ductwork through the attic. In summer, that attic hits 140–160°F. Your ducts are trying to deliver 55°F air through a space that's three times hotter than the house. Every joint, connection and tear leaks conditioned air into that superheated space.
Production builders in DFW's growth years (1995–2015) used flexible duct — the silver insulated tubes running through your attic. Flex duct is cheap and fast to install, but it degrades faster than rigid metal. The inner liner tears, connections separate from trunk lines, and insulation compresses where ducts cross framing members. After 15–20 years in a DFW attic, most flex duct systems are significantly compromised.
The real cost of duct leaks
A home with 30% duct leakage runs its AC 30% longer to maintain the same temperature. On a $200/month summer electricity bill, that's $60/month wasted — $420 per cooling season. Over 5 years: $2,100. Duct sealing ($400–$1,500) pays for itself in 1–3 cooling seasons.
Common Duct Problems by Dallas Neighborhood
Lakewood, M-Streets, Oak Lawn (pre-1960s homes)
Original metal ductwork in crawl spaces and between floors. Seams corrode and separate over decades. Many homes were retrofitted with central AC in the 1970s–1980s using undersized ducts that don't match modern system capacity. Full replacement ($3,000–$7,000) or ductless mini-splits ($7,000–$15,000) are often the best long-term solutions.
Plano, Frisco, McKinney (1990–2010 suburbs)
Flex duct in attics — the standard DFW suburban setup. These homes are now 15–30 years old. Common issues: disconnected runs at trunk line connections, crushed ducts where homeowners stored items in the attic, and degraded insulation (R-4.2 when R-6 or R-8 is current standard). Sealing and re-insulation ($800–$2,500) usually solves the problem without full replacement.
Allen, Murphy, Wylie (2005–2015 builds)
Newer flex duct in better condition, but builder-quality connections are starting to separate at the 10–15 year mark. The most common issue: ducts pulled loose at boots (the connection point between duct and ceiling vent). A disconnected boot dumps conditioned air into the attic above that room. Repair: $200–$500 per connection.
Sealing vs. Replacement: Decision Guide
| Situation | Cost | Recommendation |
|---|---|---|
| Minor leaks at joints, duct intact | $400–$1,500 | Seal |
| 1–2 disconnected runs, rest OK | $200–$800 | Repair those runs |
| Multiple crushed/torn sections | $1,000–$3,000 | Partial replacement |
| 20+ year old ducts, widespread issues | $2,500–$7,000 | Full replacement |
| Replacing HVAC system simultaneously | $2,500–$7,000 | Replace — save on labor |
Ductwork Questions — Dallas
How do I know if my ducts are leaking?
Signs: rooms that won't cool below 78°F while others hit 72°F easily, dusty air coming from vents (duct leaks in the attic pull in insulation fibers), higher electricity bills than similar-sized homes, and visible gaps or disconnected ducts in the attic. The definitive test: a duct blaster pressure test ($100–$300). It measures exactly how much air your ducts leak. The average DFW home loses 25–35% of conditioned air through duct leaks.
Is duct cleaning worth it in Dallas?
Maybe, but not from the $99 companies that spam your mailbox. Legitimate duct cleaning costs $300–$500 and makes sense if: you just had major renovation (drywall dust in ducts), you're moving into a home with pets and the previous owner never cleaned the ducts, or visible mold is present. It does NOT make sense as annual maintenance — that's a sales pitch. Your air filter catches 95%+ of airborne particles. A clean filter matters far more than clean ducts.
Why are some rooms hotter than others?
Four causes in DFW homes: 1) Disconnected duct in the attic — the run separated from the trunk line and is dumping conditioned air into the attic instead of the room. 2) Crushed flex duct — furniture, stored boxes or foot traffic in the attic collapsed the duct, restricting airflow. 3) Undersized duct run — the builder used 6-inch flex where 8-inch was needed (common in 2000s production homes). 4) Missing damper — the duct branch doesn't have a balancing damper to regulate airflow. A duct inspection ($100–$300) pinpoints which cause.
Should I replace my ducts when I replace my HVAC system?
If your ducts are over 20 years old — yes, strongly consider it. Old ductwork was sized for 8–10 SEER equipment that moved less air. New 16+ SEER2 systems push more airflow and need properly sized ducts to work efficiently. Installing a $10,000 system on 25-year-old leaky ducts is like buying a sports car and putting bald tires on it. Replacing ducts during a system install adds $2,500–$7,000 but you save on labor (the crew is already there) and the new system runs at rated efficiency from day one.
What is Aeroseal duct sealing?
Aeroseal is a technology that seals duct leaks from the inside. The technician pressurizes your duct system and injects aerosolized sealant particles. The particles are drawn to leak points by the escaping air and build up to seal the gaps — kind of like how a tire plug works. It seals leaks you can't reach by hand (inside walls, between floors). Cost: $1,000–$2,500. Most effective on homes with moderate leakage. If your ducts are severely damaged or disconnected, Aeroseal won't help — you need physical repair or replacement.
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