LC Heating & Air provides professional duct sealing services in Cudahy to stop energy loss, balance room temperatures, and improve your HVAC system's efficiency. We use diagnostic duct blaster testing to identify leaks and apply permanent sealing solutions like mastic or Aeroseal.
Duct Cleaning & Air Duct Service in Cudahy
LC Heating & Air provides duct cleaning in Cudahy — 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 Cudahy, 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’ve spent years working on HVAC systems across Los Angeles, and if there is one thing I see in Cudahy homes that wastes more money than anything else, it’s leaky ductwork. When your ducts have gaps or holes, you aren't just paying to cool your living room; you are paying to cool your attic, your crawl space, and the wall cavities. That is money literally blowing away.
At LC Heating & Air, we don't believe in guessing. We use a diagnostic process to find exactly where your system is losing air. Whether we are using manual mastic sealing for accessible joints or Aeroseal for those hard-to-reach internal leaks, our goal is to make sure the air your furnace or AC works to create actually makes it into your home. If you are tired of uneven temperatures or high utility bills, let’s take a look at your duct system.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
Cudahy, CA 90201
CSLB #1073586
Duct leakage testing and permanent sealing solutions
Why Duct Sealing Matters in Cudahy
Cudahy has a mix of housing styles, from older single-family homes to small multifamily buildings. In many of these properties, the ductwork is original or has been modified during remodels. Over time, the connections at the plenums and the joints in the flex duct start to separate. Because our local climate involves significant heat, those leaks are pulling hot, dusty air from your attic directly into your supply stream.
When I inspect a system, I often find that the ductwork was never properly sealed during the initial installation or subsequent repairs. This leads to rooms that stay hot even when the AC is running full blast. By sealing these leaks, we stop the cycle of the HVAC system running constantly just to compensate for the air that never reaches the vents.
Understanding Your Home's Duct System
Whether you live in a single-family home or a duplex, your duct system is the lungs of your HVAC. In Cudahy, we often see a mix of rigid sheet metal and flexible ducting. Sheet metal ducts are prone to leaking at the seams, while flex duct can become crushed or disconnected in tight attic spaces. If your home has undergone a remodel, there is a good chance the duct runs were extended or modified without proper airflow balancing.
We check your duct condition, airflow, and equipment placement before recommending any work. It is important to know if your ducts are actually sized correctly for your equipment. Sometimes, sealing the leaks is exactly what the system needs, but other times, we might find that the ductwork is too small, which creates pressure issues. We’ll give you an honest assessment of what your specific home needs.
Our Diagnostic Process
We don't just walk in and start applying sealant. We start with a duct blaster test. This is a standard procedure where we pressurize your duct system to measure exactly how much air is leaking out. This gives us a baseline number. Once we know how much leakage you have, we can determine the best way to fix it.
After we perform the sealing—whether it's manual mastic application or the Aeroseal process—we run the duct blaster test again. This gives you a 'before and after' result. You get to see the actual improvement in your system's performance. It’s about being transparent and making sure the work we did actually solved the problem.
Repair or Replace? Making the Right Decision
One of the most common questions I get is, 'Leo, should I just seal these ducts or replace the whole system?' The answer depends on the condition of the ducts. If the ductwork is structurally sound but just has leaky joints, sealing is a fantastic, cost-effective way to improve efficiency. It’s a permanent fix that lasts for the life of the system.
However, if the ducts are severely damaged, crushed, or made of outdated materials that are falling apart, sealing might just be a band-aid. In those cases, I will tell you straight up that replacement is the better long-term investment. My job is to give you the information you need to make a decision that makes sense for your budget and your home.
What to Expect Regarding Costs
I believe in being upfront about costs. Duct sealing isn't a one-size-fits-all service. For manual mastic sealing of accessible sections, you are generally looking at $400 to $1,200. If we use the Aeroseal internal sealing process for a typical single-story home, the range is usually $1,500 to $3,000. These prices include the diagnostic testing.
The value comes in the energy savings. Studies show that sealing 20–30% duct leakage can reduce your HVAC energy use by 15–25%. At current electricity rates, that adds up quickly. We provide a written estimate after our initial diagnostic so you know exactly what the job entails before we start.
Access and Scheduling
Because Cudahy homes vary in age and layout, access is a major factor. If your ducts are in a tight attic or a crawl space, we need to ensure we can safely reach them to perform the work. During our initial visit, we check the access points to ensure we can do the job right. Most residential duct sealing projects take about a single day to complete.
We work with your schedule to minimize disruption. If we are using the Aeroseal process, we do ask that you vacate the home for about 60 to 90 minutes during the injection phase, but you can return as soon as the process is complete and the system has run briefly. We’ll coordinate all of this with you ahead of time.
Common Duct Sealing Mistakes to Avoid
The biggest mistake I see is homeowners trying to use standard silver 'duct tape' to fix leaks. That tape dries out, cracks, and falls off within a few years. It is not rated for HVAC use. We use high-quality mastic, which stays flexible and creates a permanent seal, or foil-backed HVAC tape where appropriate.
Another mistake is ignoring the ductwork when replacing an HVAC unit. If you install a high-efficiency furnace or AC but leave your old, leaky ducts in place, you are essentially putting a high-performance engine into a car with a flat tire. Always test your ducts when you upgrade your equipment.
Health and Safety Considerations
Your indoor air quality is a priority. Leaky ducts don't just lose conditioned air; they also pull in dust, insulation particles, and pollutants from your attic or crawl space. By sealing those leaks, we are preventing those contaminants from being circulated through your home.
Regarding the materials we use, Aeroseal is safe. The polymer used is the same material found in chewing gum and other food products. It is non-toxic and stays inside the duct walls once cured. We always perform a testing phase to ensure your ducts are clean before we seal them, keeping your air supply clean and healthy.
Is It Time to Seal Your Ducts?
If you notice your energy bills are high for the size of your home, or if you have rooms that never seem to get comfortable, it’s time for a professional look. Don't wait for a total system failure to address your ductwork. A simple diagnostic test can tell us exactly how much air you are losing.
At LC Heating & Air, we are here to help you make an informed decision. We’ll show you the numbers, explain the condition of your ducts, and give you an honest recommendation. Give us a call at (323) 970-3113 to schedule an inspection.
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 system size and total square footage
- • Accessibility of ductwork in attics or crawl spaces
- • Type of ducting (flex vs. sheet metal)
- • Severity of existing leaks
- • Choice between manual mastic sealing and Aeroseal internal sealing
Useful next steps
Duct Sealing in Cudahy at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Cudahy, CA 90201
- • 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 Cudahy
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Cudahy 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 Cudahy customers say about duct sealing
Verified reviews from homeowners in Cudahy 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.”
