Professional duct sealing services to stop energy loss, improve airflow, and increase home comfort in East Los Angeles. We provide diagnostic testing and permanent sealing solutions.
Duct Cleaning & Air Duct Service in East Los Angeles
LC Heating & Air provides duct cleaning in East Los Angeles — 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 East Los Angeles, 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 East Los Angeles homes, and one of the most common issues I see isn't the furnace or the AC unit itself—it's the ductwork. If your HVAC system is working hard but your rooms still feel uneven, or your energy bills are higher than they should be, you might be paying to air-condition your attic or crawl space instead of your living room.
Duct sealing is one of the most practical, high-return improvements you can make. Whether we are sealing accessible joints with mastic or using Aeroseal for hidden leaks, the goal is the same: making sure the air your system produces actually reaches the rooms where you live. We are a local, licensed contractor (CSLB #1073586) and we believe in giving you a clear, honest assessment of your system's condition before recommending any work.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
East Los Angeles (90022)
CSLB #1073586
(323) 970-3113
Why Duct Sealing Matters in East Los Angeles
In East Los Angeles, we deal with a wide variety of housing stock, from older single-family homes to small multifamily buildings and remodels. Many of these homes have duct systems that have never been inspected. Over time, duct tape dries out, sheet metal joints loosen, and flex ducts get crushed or torn. When this happens, conditioned air leaks into attics, wall cavities, or garages.
This is a major issue because our local climate—with its intense heat and dust—forces HVAC systems to run long cycles. If your ducts are leaking, your system has to work even harder to compensate for the lost air. This leads to premature equipment wear, higher utility bills, and inconsistent temperatures. We focus on identifying these specific leakage points to help you decide if a repair is enough or if a more comprehensive sealing process is needed.
Understanding Your Home's Ductwork
Every home is different. In some of the older homes in our area, we find original sheet metal ductwork that has developed gaps at the seams. In newer remodels, we often find flex duct that has been poorly installed or kinked during construction, which restricts airflow.
Before we suggest any sealing, we look at the whole picture: access, electrical, duct condition, airflow, and equipment placement. We don't just look for leaks; we look at why the leaks are happening. If the ductwork is structurally sound but just leaky, manual sealing is often the right path. If the ducts are inaccessible or have distributed leakage throughout the system, we might recommend Aeroseal. We explain the 'why' behind our recommendation so you can make an informed decision.
Our Diagnostic Process
We don't guess. We start with a duct blaster test to quantify exactly how much air you are losing. This test gives us a baseline percentage of leakage. By knowing the numbers, we can tell you if sealing will provide a meaningful return on your investment.
After we perform the sealing—whether via manual mastic application or the Aeroseal process—we run the duct blaster test again. This gives you written documentation of the before-and-after results. It’s the only way to be sure the job was done right and that your system is performing as it should.
Repair vs. Replacement: Making the Right Call
I’m often asked if it’s better to seal old ducts or replace them entirely. If the ductwork is in good shape but has a few leaks, sealing is a great, cost-effective repair. However, if the ducts are crushed, collapsed, or heavily contaminated with dust and debris, sealing might be a waste of money. In those cases, I will tell you that replacement is the better long-term investment.
My job is to give you the facts so you can decide. If the system is worth repairing, we will tell you. If the pattern points to replacement, we will explain why. We want you to have a system that fits your property, not a generic recommendation.
Factors Influencing Cost
The cost of duct sealing depends on the size of your home, the accessibility of the ducts, and the method required. Manual mastic sealing is generally more labor-intensive in terms of physical access, while Aeroseal is a specialized process that seals from the inside. We provide a written estimate after our initial diagnostic so you know exactly what to expect before we begin.
Keep in mind that while duct sealing is an investment, it is one of the highest-ROI energy improvements you can make. Sealing 20–30% duct leakage can reduce your HVAC energy use by 15–25%. At current electricity rates, that often pays for itself in under two years.
Access and Scheduling
We know your time is valuable. Most residential duct sealing projects in East Los Angeles can be completed in a single day. Whether we are working in an attic, a crawl space, or a tight utility closet, we prioritize safety and cleanliness.
We will coordinate with you to find a time that works, and we always perform a site assessment first to ensure we have the right tools and access for your specific home layout. If you have questions about the process or need to schedule an inspection, give us a call at (323) 970-3113.
Common Mistakes to Avoid
The biggest mistake I see is the use of standard 'duct tape'—the silver cloth tape you find at the hardware store. It dries out, cracks, and fails within a few years. We use professional-grade mastic, which stays flexible and adheres permanently to the ductwork.
Another mistake is ignoring the duct system when replacing an HVAC unit. If you install a new, high-efficiency furnace or AC but leave behind leaky, inefficient ducts, you aren't getting the efficiency you paid for. California Title 24 requires duct leakage testing for permitted replacements for a reason—it ensures the whole system works together.
Health and Safety
Your health and safety are our top priorities. When we use Aeroseal, the material is non-toxic—it's the same polymer used in chewing gum. We recommend that you vacate the home for about 60–90 minutes during the injection process as a precaution, but you can return as soon as it's finished.
We also ensure that our work complies with all local requirements. If you are doing a larger HVAC project, we can guide you through the permit process to make sure everything is documented and up to code.
Is Duct Sealing Right for You?
If you notice high energy bills, uneven temperatures, or excessive dust, it's time for a professional look. We don't believe in high-pressure sales; we believe in showing you the data from your own system.
If you're ready to see if your ducts are leaking, give LC Heating & Air a call. We'll come out, test your system, and give you a straight answer about whether sealing is the right move for your home.
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
- • System size and total square footage
- • Accessibility of ductwork in attics or crawl spaces
- • Choice between manual mastic sealing and Aeroseal
- • Existing condition of ductwork (e.g., severe damage vs. minor leaks)
Useful next steps
Duct Sealing in East Los Angeles at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: East Los Angeles, CA 90022
- • 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 East Los Angeles
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for East Los Angeles 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 East Los Angeles customers say about duct sealing
Verified reviews from homeowners in East Los Angeles and nearby neighborhoods who used our duct sealing service.
“AC wasn't cooling to setpoint even though it was running all day. LC found the condenser coils were completely clogged with cottonwood. Cleaned them on the spot and the system cooled my house 12 degrees in an hour.”
“LC replaced our entire HVAC system — new Carrier condenser, furnace, and coil. Leo walked us through every option without pressure. The install team was professional and clean. System runs perfectly and our electricity bill dropped about 30%.”
“Called LC because our CO detector went off. Their technician found a crack in the heat exchanger and immediately shut down the furnace. He explained the safety issue clearly, provided a replacement estimate, and didn't try to scare us — just facts.”
