LC Heating & Air provides expert duct sealing services to help Malibu homeowners reduce energy waste and improve home comfort. We use professional duct blaster testing to identify leaks and apply permanent sealing solutions.
Duct Cleaning & Air Duct Service in Malibu
LC Heating & Air provides duct cleaning in Malibu — including air duct cleaning, duct repair service, duct sealing, HVAC ductwork. Whether you need same-day service, a written estimate, or help deciding between repair and replacement, our licensed technicians handle every make and model.
We repair and service all major HVAC brands in Malibu, including Carrier, Trane, and Goodman, and older or discontinued units. No matter the manufacturer, we diagnose the problem accurately and give you an upfront price before any work begins.
I'm Leo, owner of LC Heating & Air. I spend a lot of time in Malibu crawl spaces and attics, and I see the same issue over and over: homeowners are paying to heat or cool their attics and wall cavities instead of their living rooms. When your ductwork leaks, your HVAC system has to work twice as hard to reach the temperature you set on the thermostat.
Duct sealing is one of the most practical investments you can make for your home. By sealing leaks, you stop wasting conditioned air, which helps your system run shorter cycles and saves on energy costs. At LC Heating & Air, we don't guess. We use diagnostic testing to find exactly where your system is losing air and then apply the right fix—whether that is manual mastic sealing or Aeroseal internal sealing.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
Why Malibu Homes Need Duct Sealing
Malibu's coastal environment creates unique challenges for HVAC systems. Between the marine-layer humidity and the salt air, ductwork—especially older flex duct—can degrade faster than in inland areas. When ducts develop cracks or loose connections, that salt-heavy air can be pulled into your system, and your conditioned air leaks out into unconditioned spaces.
In many of the homes I visit here, the ductwork is tucked away in tight attics or crawl spaces where it's hard to see the damage. If you notice dust buildup around your registers or if one room in your house is always significantly warmer or colder than the others, it is often a sign that your ducts are leaking air before it ever reaches the vent.
Understanding Your Home's Ductwork
Malibu has a mix of older beach properties and newer, high-efficiency renovations. Older homes often have sheet metal ductwork with failing tape joints, while newer homes might have flex duct that has been crushed or kinked during construction or maintenance work. Both types of systems are prone to leakage.
When I inspect a system, I look at the return sizing and the insulation levels. If your ducts aren't sealed, even the most efficient HVAC unit will struggle to keep up. We focus on getting the air to where it belongs, which makes the whole system more reliable and less prone to the comfort swings common in our coastal climate.
Our Diagnostic Process
We don't just look at the ducts and guess. We start with a duct blaster test. This involves pressurizing your duct system and measuring exactly how much air is escaping. This gives us a clear number—a percentage of leakage—that tells us how much of your energy is being wasted.
Once we have the data, we decide on the best approach. If the leaks are at accessible joints and plenums, we use mastic, which is a thick, permanent sealant. If the leaks are deep inside the walls or in inaccessible areas, we use the Aeroseal process to seal them from the inside out. We finish every job by re-testing the system to prove the leakage has been reduced.
Repair vs. Replace: Making the Right Call
A common question I get is whether to patch up old ducts or replace them entirely. If your ducts are structurally sound but just leaking at the joints, sealing is almost always the right move. It’s cost-effective and provides an immediate improvement in airflow.
However, if the ductwork is collapsed, heavily corroded from salt air, or infested with mold, sealing won't solve the underlying problem. In those cases, I will tell you straight that replacement is the better long-term investment. My goal is to provide a solution that lasts, not a temporary patch that you'll have to pay to fix again in two years.
What to Expect Regarding Costs
I believe in being transparent about costs. Duct sealing isn't a one-size-fits-all price because every home's accessibility is different. Manual mastic sealing typically ranges from $400 to $1,200, while the Aeroseal process for a typical single-story home usually runs between $1,500 and $3,000.
These prices include the diagnostic testing and the documentation you need. If you are doing this as part of a larger HVAC replacement, it's often required for permit compliance anyway. We provide a written estimate before we start any work, so you know exactly what you are paying for.
Scheduling Your Service
Living in Malibu means we have to plan for the specific access challenges your home might have, whether that's roof-mounted condensers or tight crawl spaces. When you call LC Heating & Air at (323) 970-3113, we’ll talk through your system's layout to make sure we arrive prepared.
Most duct sealing projects can be completed in a single day. If we are using the Aeroseal process, we do ask that you vacate the home for about 60 to 90 minutes while the material is being applied. It's a non-toxic, safe process, but it's just standard practice to keep everyone comfortable while we work.
Mistakes to Avoid
The biggest mistake I see is homeowners using standard silver 'duct tape' to fix leaks. That tape dries out and falls off within a year or two in our climate. If you see silver tape peeling off your ducts, it’s time to have it replaced with proper mastic or foil-backed HVAC tape.
Another mistake is ignoring duct leakage when replacing an HVAC unit. If you install a high-efficiency furnace or AC but leave the leaky ducts, you aren't getting the efficiency you paid for. Always test your ducts when you upgrade your equipment.
Health and Safety Considerations
Your indoor air quality is tied directly to your ductwork. If your ducts are leaking in a crawl space or attic, they can pull in dust, insulation fibers, and moisture. Sealing those leaks stops that contamination from entering your living space.
The materials we use, like the vinyl acetate polymer in Aeroseal, are non-toxic and safe. We take the time to ensure your system is clean before we seal it, so you aren't just trapping debris inside your walls. We prioritize your home's safety as much as its energy efficiency.
Is Duct Sealing Right for Your Home?
If your energy bills are high and you feel like your system is always running but never quite hitting the right temperature, duct sealing is likely your best next step. It’s a targeted, high-impact repair that addresses the root cause of air loss.
Call LC Heating & Air at (323) 970-3113. We’ll come out, run the tests, and give you an honest assessment. If your ducts are in good shape, I’ll tell you. If they need sealing, I’ll show you the numbers and explain exactly how we’ll fix them.
How the visit works
We perform a duct blaster test to quantify existing leakage as a percentage of system airflow.
Based on leakage quantity, duct type, and accessibility, we recommend manual sealing, Aeroseal, or a combination.
We apply mastic to all accessible joints and plenums, or set up and run the Aeroseal process for internal sealing.
We re-run the duct blaster test and provide you with before/after leakage numbers as written documentation.
Cost factors we review before quoting
- • Duct inspection: $125–$200
- • Duct cleaning (whole house): $400–$900
- • Duct sealing: $1,000–$3,000
- • Duct repair or replacement: $500–$5,000
Useful next steps
Duct Sealing in Malibu at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Malibu, CA 90265
- • License: CSLB C-20 #1073586
- • Phone: (323) 970-3113
- • Estimate: written estimate before approved work
- • Emergency calls answered within 30 minutes (24/7)
Our duct sealing process in Malibu
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Malibu is reviewed for practical HVAC accuracy by Leo at LC Heating & Air. LC Heating & Air holds California CSLB C-20 HVAC license #1073586 and provides written estimates before approved work.
What Malibu customers say about duct sealing
Verified reviews from homeowners in Malibu and nearby neighborhoods who used our duct sealing service.
“Had LC install a Daikin mini split in our 1940s bungalow that never had AC. The work was clean, the unit is incredibly quiet, and our bedroom finally stays cool in summer. Highly recommend.”
“We converted our garage into an ADU and needed HVAC. LC installed a Mitsubishi single-zone mini split — permits, electrical, everything. The unit is so quiet you can barely hear it running. Our tenant loves it.”
“Got a 3-zone Daikin system for our craftsman home — bedrooms upstairs, living room downstairs. Each room has its own temperature control and the monthly electric bill is actually lower than our old window units combined.”
