LC Heating & Air provides professional duct sealing to stop energy loss and improve comfort in Boyle Heights homes. We use duct blaster testing to identify leaks and apply mastic or Aeroseal to ensure your system runs efficiently.
Duct Cleaning & Air Duct Service in Boyle Heights
LC Heating & Air provides duct cleaning in Boyle Heights — 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 Boyle Heights, 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 the unique housing stock here in Boyle Heights, from older multifamily properties to compact residential units. One of the most common issues I see isn't the furnace or the AC unit itself—it's the ductwork. If your ducts are leaking, you are paying to cool or heat your attic, wall cavities, or crawl spaces instead of your living room.
Duct sealing is one of the most practical ways to improve your home's performance. Whether we are dealing with aging sheet metal or compromised flex duct, the goal is the same: making sure the air your system works hard to condition actually reaches your vents. At LC Heating & Air, we don't guess; we use duct blaster testing to quantify your leakage and provide a clear, honest assessment of what needs to be done.
Call LC Heating & Air at (323) 970-3113 for scheduling and estimates.
Local HVAC considerations
Common Duct Issues in Boyle Heights
In a neighborhood like Boyle Heights, we deal with a lot of older buildings and mixed-use properties. Many of these homes have mechanical closets or rooftop package units where the ductwork is tucked into tight, inaccessible spaces. Over time, the connections at these junctions loosen, or the flex duct gets crushed or torn during other home repairs. This leads to 'conditioned air loss,' where your system runs constantly but the temperature in your home never quite stabilizes.
Another pattern I see is dust accumulation near supply registers. If you notice a fine layer of dust appearing quickly after you've cleaned, it’s often a sign that your return ducts are pulling air from dusty attics or wall cavities rather than from inside your home. This isn't just an efficiency problem; it’s an indoor air quality issue that we can address through proper sealing and testing.
Working with Boyle Heights Architecture
Boyle Heights has a mix of historic homes and dense multifamily buildings. When I’m working on a project here, I have to consider the specific constraints of the building. We often deal with shared walls, limited rooftop access, and tight mechanical closets. These aren't just technical hurdles; they change how we approach a repair.
For example, in a building with limited attic access, manual mastic sealing might not be possible for every joint. That’s when I’ll recommend Aeroseal. It allows us to seal leaks from the inside without needing to tear into walls or ceilings. My job is to look at your specific layout and recommend the method that actually makes sense for your property, not just the one that’s easiest for me.
Our Diagnostic Process
I don't believe in 'eyeballing' a duct system. Before we do any work, we perform a duct blaster test. This involves pressurizing your duct system and measuring exactly how much air is escaping. This gives us a baseline percentage of leakage.
Once we have that number, we can decide the best path forward. If the leaks are at accessible joints, we use high-quality mastic. If the leaks are deep in the walls or in inaccessible areas, we use the Aeroseal process. After we finish, we run the test again. You’ll get the before-and-after numbers in writing so you know exactly what you paid for.
Repair or Replace?
Homeowners often ask me if they should just replace their ductwork entirely. The truth is, most systems can be salvaged with professional sealing. If the ductwork is structurally sound but just has loose joints or small tears, sealing is the most cost-effective solution. It’s a permanent fix that lasts for the life of the system.
However, if the ducts are severely collapsed, infested with mold, or made of outdated materials that are falling apart, sealing won't be enough. If I see that, I’ll tell you straight. I’d rather lose a job than recommend a repair that won't solve your comfort problems in the long run.
Understanding Costs
Duct sealing costs vary based on the size of your home and the accessibility of the ducts. A simple manual sealing project might cost between $400 and $1,200, while a full Aeroseal process for a single-story home typically ranges from $1,500 to $3,000. Every project includes the diagnostic testing and the final verification test.
When you look at the cost, think about the energy savings. Reducing duct leakage by 20% can lower your HVAC energy use by 15–25%. In Los Angeles, where electricity rates are high, that often pays for the service in under two years. We provide a written estimate after our initial inspection so you know exactly what the investment is before we start.
Scheduling and Access
Working in Boyle Heights often requires coordination. If you live in a condo or a building with an HOA, we’ll need to work within your building's access windows. I’m used to navigating parking limits and rooftop equipment, so we’ll make sure the logistics are handled before we arrive.
Most residential duct sealing projects are completed in a single day. If we are using Aeroseal, we’ll ask that you step out of the home for about 60 to 90 minutes while the process runs. It’s a straightforward process, and we make sure to leave your home as clean as we found it.
Mistakes to Avoid
The biggest mistake I see is homeowners using standard silver duct tape to fix leaks. That tape dries out and fails within a year or two. It’s not meant for HVAC systems. We use professional-grade mastic, which stays flexible and holds up to the temperature changes in your attic.
Another mistake is skipping the testing phase. If you have a contractor seal your ducts without a duct blaster test, you have no way of knowing if they actually fixed the problem or just covered up the easy-to-reach spots while leaving the real leaks behind. Always ask for the before-and-after test results.
Health and Safety
Your indoor air quality is a priority. When we seal your ducts, we aren't just saving energy; we are preventing your system from pulling in dust, insulation fibers, and debris from your attic or crawl space. This helps keep your air cleaner.
The materials we use, including the Aeroseal polymer, are non-toxic and safe. Aeroseal is actually made of the same material used in chewing gum. We take all necessary precautions to ensure the process is safe for your family and pets, and we confirm the system is clear before we finish.
Is Duct Sealing Right for You?
If your energy bills are high, your home has hot or cold spots, or you’re planning to replace your HVAC unit soon, duct sealing is a smart move. It’s a high-ROI improvement that makes your entire system work better.
At LC Heating & Air, I’ll come out, test your system, and give you an honest answer. If your ducts are in good shape, I’ll tell you. If they need work, I’ll show you the data and give you a written estimate. 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
- • Total square footage of the duct system
- • Accessibility of ductwork (attic, crawl space, or walls)
- • Type of sealing required (manual mastic vs. Aeroseal)
- • Existing condition of the ductwork
Useful next steps
Duct Sealing in Boyle Heights at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Boyle Heights, CA 90033
- • 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 Boyle Heights
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Boyle Heights 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 Boyle Heights customers say about duct sealing
Verified reviews from homeowners in Boyle Heights 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.”
