Duct Sealing in Long Beach - Leakage Measured, Then Priced in Writing

Trusted Duct Sealing for Long Beach Homeowners

Long Beach Duct Sealing runs between $400 and $2,400, depending on system size and how much of the ductwork needs attention. That’s the range we write down before any work starts, and it doesn’t move at the door. Leaky ducts in Long Beach homes push conditioned air into attics and crawl spaces instead of living rooms, which means higher SMUD or PGE bills and rooms that never quite reach the temperature on the thermostat.

Call (562) 548-7365

Roy Castellanos leads our Long Beach crew. We’ve been sealing ductwork since 2004, which means we’ve worked on crawl spaces in Bixby Knolls, older ranch homes in Los Altos, and split-levels in East Long Beach. The fix is straightforward: we find the leaks, seal them with mastic and proper tape, and test the result with a duct blaster. Call (562) 548-7365 for a written quote.

Key Takeaways:

• Whole-home duct sealing in Long Beach typically costs $400 to $2,400, quoted in writing before work begins.
• Sealed ducts can cut energy loss by 20-30% in leaky systems, especially in older coastal homes.
• Every job carries the 365-Day Done Right Promise: if the seal fails within a year, we return at no charge.
• We use mastic and UL-rated tapes, not hardware-store foil tape that dries out and separates in attic heat.

Duct Insulation

Duct Insulation is the material wrapped around ductwork to stop conditioned air from losing its temperature before it reaches the register. In Long Beach, where summer attic temperatures regularly pass 130 degrees, uninsulated ducts in unconditioned attics force your AC to work against a heat source the moment air leaves the unit. That shows up as warm air from bedroom registers in July and a furnace that runs constantly without warming the back rooms in January.

When Insulation Fails

Insulation on older Long Beach homes degrades: rodents tear it apart, roof leaks soak it, and decades of temperature swings turn fiberglass batts into dust. If you see frost on ducts in winter or condensation dripping in summer, the insulation is no longer doing its job. We replace it with rated R-6 or R-8 wrap depending on what the attic conditions call for.

What Replacement Includes

Hollis Air Duct Long Beach removes the failing insulation, inspects the duct underneath for leaks, seals them, then wraps the section fresh. The material gets secured with tape and pins, not just draped over the pipe. If the original insulation got wet, we address the moisture path first so the new wrap doesn’t fail within a season. Costs run $300 to $1,200 depending on the linear footage involved.

HVAC Duct Sealing

HVAC Duct Sealing is the process of finding and closing every leak in the duct system so the air you pay to condition actually reaches your rooms. Most Long Beach homes lose 20 to 30 percent of their conditioned air before it ever gets to a vent. The leaks are at joints, seams, and takeoff collars – places where ducts connected to registers or plenums were never properly sealed, or where old tape has failed.

The Mastic Standard

We seal with brush-on mastic and UL 181-rated aluminum tape, the same materials commercial HVAC crews are required to use. Hardware-store duct tape, the gray cloth stuff, dries out and separates within a few years of Long Beach attic heat – it’s not a sealant, it’s a temporary patch. Mastic goes on as a paste and cures into a permanent, flexible seal that moves with the duct as it expands and contracts.

Testing Without Testing

Some crews offer a visual inspection and call it done. We offer a duct blaster test, which measures the actual leak rate in cubic feet per minute. The reading tells us whether the system is tight enough to walk away or whether a second pass is required. You see the before-and-after numbers, not just a technician’s word that it’s sealed. Expect $400 to $2,400 for a full-system seal in Long Beach depending on home size and accessibility.

Duct Repair

Duct Repair covers anything short of a full seal: collapsed flex runs, crushed sheet metal, disconnected takeoffs, or sections that rodents have torn open. In Long Beach’s older housing stock, it’s common to find flex ducts from the 1980s and 90s that have sagged or split along the wire coil. Those leaks don’t just waste energy – they pull unfiltered attic air, dust, and pest debris into the airstream your family breathes.

Disconnected Runs

When a flex duct separates from its takeoff fitting, the entire run can be blowing conditioned air into the attic instead of the room below. We find these with a smoke test or an infrared probe, reconnect the run, and secure it with staples, mastic, and proper strapping so it doesn’t sag back apart. A disconnected run is usually the single biggest leak in a home, and fixing it can immediately improve airflow to one or two problem rooms.

Crushed and Kinked Sections

Flex duct that was installed too long, hung too loosely, or run around tight corners ends up kinked like a garden hose. Airflow drops, the room gets stuffy, and the system has to run longer to compensate. We replace the damaged section with the correct length, add support straps every four feet, and keep bends shallow. Repairs of this type typically run $200 to $800 depending on how long the damaged segment is and whether it’s reachable from an attic, crawl space, or interior chase.

Air Duct Sealing

Air Duct Sealing means closing air leaks in the supply and return sides of your forced-air system. Supply leaks push treated air out. Return leaks pull in unfiltered air – dust, humidity, whatever’s floating around your attic or crawl space – and redistribute it into every room. Return-side leaks are often the bigger energy problem because they change the air pressure in the house, which makes outside air rush in through windows, doors, and outlets.

Supply vs. Return Leaks

A supply leak pushes air into spaces nobody lives in. A return leak pulls air in from spaces nobody wants inside the house. We investigate both sides during our Duct Sealing in Wilmington and Long Beach, because fixing only the supply side can actually make a return leak worse by increasing negative pressure. The price includes both sides of the system – we don’t quote one and then upsell the other.

What Leaks Cost in Long Beach

An average single-family home here has 180 to 250 linear feet of ductwork, and typical leak rates on homes built before 2000 run 25 to 40 percent. Sealing those leaks can take 15 to 20 percent off the cooling bill, which in Duct Sealing in Seal Beach and Long Beach’s six-month cooling season adds up. Duct sealing for a typical three-bedroom home runs $600 to $1,600. Larger homes with floor registers and inaccessible crawl spaces push toward the higher end.

Duct Sealing Services

our Duct Sealing in Carson and Long Beach begins with an inspection, not an invoice. We locate every leak using a combination of pressurization testing, visual inspection of accessible ductwork, and smoke tracing where needed. The written quote covers all found leaks – not half of them, not the easy ones. If the duct blaster reading shows the system is still leaking after the initial pass, we keep sealing until the numbers show a tight system.

What We Seal

We seal supply plenums, return boxes, takeoff collars, starting collars, flex-to-sheet-metal connections, and any section joint that shows leakage. That includes the boots where registers mount to the floor or ceiling, a spot that leaks into wall cavities and is almost never sealed during original construction. Every connection gets brushed mastic, and every flex fitting gets a rated tape wrap over the mastic. You won’t find us relying on mastic alone on joints that move.

What You Don’t Have to Do

We protect the work area, run hoses and equipment without dragging them through your living room, and leave the site the way we found it – drops out, debris loaded, registers wiped down. The 365-Day Done Right Promise covers every seal for a full year. If a seam opens back up or a flex fitting separates within 365 days, we return and reseal it at no charge, no questions. That’s the Garrison Standard: the work is done right or it gets done again.

Our Process, Step by Step

1. 1
   System walkthrough. We start by looking at the duct layout: where the unit sits, where registers are, which runs go through the attic, walls, or crawl space. We also ask about problem rooms – the one that’s always hot, the one that smells musty, the register that barely moves air. That conversation tells us where to look first.
2. 2
   Leak testing with a duct blaster. We seal the registers and pressurize the system with a calibrated fan, then measure how much air escapes per minute. That number is the baseline. It tells us whether the system is average, bad, or worse than we expected, and it gives you an objective number on the invoice.
3. 3
   Written quote before any work. The price goes on paper, and it doesn’t move. If we find additional leaks during the work that were hidden behind insulation or inside a wall chase, we show you. The price only changes if you approve the extra work. We never finish and hand you a surprise invoice.
4. 4
   Sealing the leaks. Mastic goes on every joint, seam, and takeoff. Flex connections get rated tape over the mastic. We work in sections and check each one as we go, so a leak in one part of the attic doesn’t get missed because we were rushing to the next room.
5. 5
   Re-test and closeout. The duct blaster goes back on. The new reading shows what changed. You get the before and after numbers, a walkthrough of what we sealed, and a copy of the 365-Day Done Right Promise in writing. Then we clean up and leave. The whole job runs four to eight hours for most Long Beach homes.

Frequently Asked Questions About Duct Sealing in Long Beach

Signs You Need a Pro Right Now

• Rooms that never match the thermostat. The back bedroom runs six degrees warm in summer, the den stays cold in winter. That’s air escaping the duct run before it reaches the room. You’re paying to condition the attic, not the house.
• Dust piling up within days of cleaning. Return-side leaks pull unfiltered air from the attic or crawl space into the system, then push it through every register. If your furniture collects dust within 48 hours of wiping it down, the return path is leaking.
• Energy bills climbing without a matching change in usage. Southern California Edison rates have gone up, but a jump of 20 to 30 percent year-over-year without a change in thermostat habits points to duct leaks. Sealed ducts mean the AC runs fewer cycles to hit the same temperature.
• Musty or stale smells when the system runs. A return leak under the house pulls in crawl space air: damp, moldy, and full of whatever else is down there. If the air coming from your registers smells different from the air in the room, you’ve got a return-side problem.
• Visible damage on exposed ducts. In garages, basements, or utility closets where duct runs are visible, torn insulation, hanging tape, or separated joints are obvious. What you can see is usually worse than what you can’t. A visible separation means other connections are failing too.

Brands We Service

We carry and install filtration products from Aprilaire and Honeywell, the two biggest names in whole-home air quality. Aprilaire’s media filters and dehumidifiers are designed to work with sealed duct systems, and we install them with proper gasketing so the filter housing itself doesn’t become a leak point. Honeywell equipment, from thermostats to whole-home filters, gets the same treatment – mounted, sealed, and tested before we leave.

Our sealing and cleaning equipment comes from Rotobrush and Abatement Technologies. The Rotobrush rotary brush system gets inside the duct runs for cleaning access, and Abatement Technologies’ negative-air machines let us seal actively while pulling a vacuum on the system, which forces mastic into small cracks and pinholes. If you have equipment from Guardsman or any other residential make, our technicians can handle it – we don’t turn down work because the badge on the unit isn’t one we see daily.

How Much Does Duct Sealing Cost in Long Beach?

Our Service Area Near Long Beach

We’re based in Long Beach and serve homeowners throughout the surrounding area, including San Pedro, Carson, Westminster, Buena Park, Lakewood, Cypress, Downey, Norwalk, and Bellflower. Most calls get a technician out within one to three business days, and we schedule in windows, not vague “sometime Tuesday” promises. If you’re in Long Beach proper or any of the nearby communities, you’re in our regular route. We also cover Duct Sealing in Huntington Beach and Duct Sealing in Garden Grove for neighbors down the 405 or off the 22. No matter where you are in the area, the process is the same: written quote first, work by the book, and the 365-Day Done Right Promise in writing.

Schedule Your Duct Sealing Service in Long Beach Today

If your rooms won’t hold temperature, your bills keep climbing, or you’re seeing dust coat every surface within days of cleaning, the ducts are the likely culprit. Call (562) 548-7365 for a free, written estimate. Roy and the Long Beach crew will walk your system, run the leak test, and hand you a price that doesn’t move. No obligation, no pressure, and someone answers the phone when you call. From our home page you can see the full scope of what we do, including Duct Sealing in Long Beach for every neighborhood we cover.

Written by Roy Castellanos, Owner at Hollis Air Duct Long Beach, serving Long Beach since 2004.