Air Duct & HVAC

Air Duct Repair & Sealing in Los Angeles, CA

A lot of comfort problems blamed on the air conditioner are really duct problems. A flex run that came off its collar in the attic dumps cooled air into a 140-degree space. A boot that pulled away from the ceiling drywall pulls attic dust straight into the room. A run crushed under stored boxes starves the bedroom at the end of it.

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What to Know About Air Duct Repair & Sealing in Los Angeles

These faults are common in Valley attics and crawlspaces, where ducts get stepped on, sagged by heat and disturbed by other trades. We find them with a camera and a walk of the attic, show you photos, and fix them properly.

Duct repair is priced after an inspection, because a single reconnected run and a full attic of resealed joints are very different jobs. You get a written quote listing each repair before any work begins.

We provide air duct repair & sealing across Los Angeles from our office in Valley Village. The city pages below explain what is typical in each area.

What Duct Repair Usually Involves

Most repairs are one of a few things: reattaching and clamping a disconnected flex run, replacing a section that is crushed or torn, re-supporting duct that sags onto the ceiling joists or crawlspace soil, and sealing the joints at the boots, the plenum and the trunk with mastic. Where a register boot has separated from the drywall, we seal it to the ceiling so the room stops pulling air from the attic.

We take before and after photos of every repair, so you can see what was wrong and what was done even though you will never go up into the attic yourself.

Why Mastic, Not Tape

Ordinary cloth duct tape dries out and lets go in attic heat, which is why so many old joints are hanging open. We seal joints with mastic and fiberglass mesh where needed, use proper clamps on flex connections, and support runs with strapping so they do not sag and kink.

Repair or Replace?

Most systems need a handful of repairs, not a new duct system. If the flex duct is brittle, torn in many places or badly contaminated after smoke or rodents, replacing sections is the better value, and we will show you why. A full duct replacement is a larger job we quote separately.

Direct answer · pricing

Air Duct Repair & Sealing in Los Angeles is priced after a free estimate. Duct repair is priced after an inspection, because a single reconnected run and a full attic of resealed joints are very different jobs. You get a written quote listing each repair before any work begins.

Duct inspection with cameraFree with a duct cleaning

Free estimate

Reconnect or replace a runQuoted per run after inspection

Free estimate

Seal joints and bootsMastic and mesh, quoted by scope

Free estimate

Signs You Need Air Duct Repair & Sealing in Los Angeles

One or two rooms that never get as cool or warm as the rest

Dust streaks on the ceiling around a register

Higher electric bills without a change in how you use the system

Whistling or rattling from the ceiling when the system runs

Attic or crawlspace dust appearing inside the house

Ducts lying on the attic floor or crawlspace soil

How Air Duct Repair & Sealing Works

Every air duct repair & sealing job follows the same steps, and you get photos of the work.

InspectWe check airflow at the registers, look inside the ducts with a camera and walk the attic or crawlspace.
Show and quoteYou get photos of each problem and a written quote that lists every repair separately.
Reconnect and replaceDisconnected runs are clamped back on, crushed sections are replaced and sagging duct is re-supported.
SealJoints at boots, plenums and trunks are sealed with mastic so the repair holds in attic heat.
VerifyWe recheck airflow at the affected rooms and send before and after photos.

Air Duct Repair & Sealing by City

We provide air duct repair & sealing in each of these cities. Pick yours for local information.

Valley VillageOur office North Hollywood Studio City Sherman Oaks Toluca Lake Burbank Glendale Encino Van Nuys Pasadena Altadena La Cañada Flintridge Arcadia South Pasadena Beverly Hills West Hollywood

Air Duct Repair & Sealing Questions in Los Angeles

How do I know if my ducts are leaking?

Uneven rooms, dust streaks at ceiling registers, high bills and attic dust inside the house are the usual signs. A camera inspection confirms it.

How much does duct repair cost?

It depends on how many runs and joints need work. We inspect first and give you a written quote listing each repair. Call (818) 722-9233.

Is duct tape good enough to seal ducts?

No. Cloth duct tape dries out in attic heat and fails. Mastic and proper clamps last far longer.

Should I repair ducts before cleaning them?

Ideally they are done together. Cleaning a system that still leaks lets dust right back in.

Do you replace entire duct systems?

We replace sections. A full duct replacement is a larger job, and we quote it separately when it is truly needed.

Related Services in Los Angeles

Inside of an air duct before and after cleaning

Air Duct Cleaning

Whole-system cleaning under negative pressure, every supply and return run, with before and after photos.

Air Duct Cleaning details →

HVAC System Cleaning

Blower, coil, drain pan and return plenum cleaned so the system moves air the way it was designed to.

HVAC System Cleaning details →

Flexible dryer duct behind a dryer in a laundry room

Dryer Vent Repair & Rerouting

Crushed, disconnected and over-long dryer vents repaired, rerouted or replaced with rigid metal duct.

Dryer Vent Repair & Rerouting details →

Book Air Duct Repair & Sealing in Los Angeles

Call for a price range on the phone, or send a request and we will confirm a time window.

Call (818) 722-9233 Request a Quote