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.

(380) 273-8053

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 Duct Repair & Sealing 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 Duct Repair & Sealing cost

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 before Duct Repair & Sealing

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.

After: Metal supply air duct labeled supply — 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 →

Before: Kinked and crushed flexible air duct — 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

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington Washington, D.C.West Virginia Wisconsin Wyoming

Ductwork Replacement & DesignNew duct systems sized with Manual D for even airflow.

Air Duct CleaningSource-removal cleaning after remodels, pests or heavy dust.

Hand adjusting a smart thermostat on a wall

Zoning SystemsMotorized dampers to balance two-story homes.

Technician inspecting an outdoor air conditioner condenser beside a house

AC RepairWarm air, no cooling, short cycling, noises and breaker trips.

Need heating or cooling help now?

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