Ductwork · Nationwide
Duct repair and sealing
In a typical house, 20–30% of the air moving through the ducts leaks out. In a 140°F Las Vegas attic, that leak means paying to cool the attic. A duct leakage test finds out how bad it is, then techs repair the disconnects and seal the joints with mastic or an aerosol sealant.
- Same-day appointments when available
- Licensed HVAC contractors
- Written price before any repair
In a typical house, 20–30% of the air moving through the ducts leaks out. Where ducts run through a hot attic in the South and Southwest, or a cold attic or crawl space in the North, every leak means paying to heat or cool unconditioned space.
Flex duct sags, kinks and pulls off its collars over time, especially after other trades work in the attic. One disconnected run can leave a bedroom with almost no airflow.
Duct Repair & Sealing at a glance
- Category
- Ductwork
- Service area
- Nationwide
- Typical visit
- Inspect and test → Repair → Seal → Retest
- Urgent help
- Scheduled service
- Equipment covered
- Flex duct, Sheet metal plenums, Register boots, Mastic, Duct blaster test rig
Symptoms
Signs you need duct repair & sealing
- One or two rooms much hotter than the rest
- Dusty house even with good filters
- Weak airflow at some registers
- High bills with a newer AC
- Visible gaps or crushed flex in the attic
Process
How the visit works
- 1
Inspect and test
Visual attic inspection and a duct blaster leakage test.
- 2
Repair
Reconnect runs, replace crushed flex, strap sagging lines.
- 3
Seal
Mastic on joints and boots, or aerosol sealing from inside.
- 4
Retest
Leakage and room airflow measured again.
Cost
What affects the price
Every contractor sets their own prices. These are the things that move the number. Ask for a written price before work starts.
- Attic access and heat
- Amount of damaged duct
- Mastic vs. aerosol sealing
- Number of registers
Before the tech arrives
What you can safely do
Safe to try
- Check that every register is open
- Look for disconnected ducts you can see
Stop and call
- Avoid attic work on hot afternoons; heat illness is a real risk
- Don't use cloth duct tape; it fails in attic heat
Example
Duct Repair & Sealing: before and after
Drag the slider to compare. These are illustrative stock photos, not jobs completed by contractors in our network.
Crushed flex duct → sealed, rigid supply duct
Kinked, torn flex runs starve rooms of air. Replacing and sealing them restores airflow to hot bedrooms.
Duct Repair & Sealing →FAQ
Duct Repair & Sealing questions
Is duct sealing worth it?+
Usually yes when ducts run through attics, crawl spaces or garages. Sealing leaks of 20% or more often shows up on the next season's energy bills.
Duct Repair & Sealing city guides
Duct Repair & Sealing by state
Related
Related services
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