LC Heating & Air provides professional duct sealing to stop energy loss and improve comfort in Century City homes. We use duct blaster testing, manual mastic sealing, and Aeroseal technology to ensure your system is efficient and compliant with California Title 24 standards. Call (323) 970-3113 for a consultation.
Duct sealing is one of the highest-ROI home energy improvements available to Century City homeowners. When conditioned air leaks into attic or wall cavities before reaching the living space, you are paying to condition space you do not occupy. Studies of California homes consistently show 20–30% duct leakage in older homes, and every percentage point of leakage reduction shows up directly in your utility bill.
At LC Heating & Air, I focus on the practical side of HVAC. Whether you are dealing with uneven temperatures in a high-rise condo or trying to maximize the efficiency of a new unit in a single-family home, the condition of your ductwork is often the missing link. I provide honest assessments and clear, written estimates so you know exactly what you are paying for before we start.
Local HVAC considerations
Century City and surrounding neighborhoods
CSLB #1073586
Emergency calls answered within 30 minutes
Common Duct Issues in Century City
In Century City, we often see duct systems that were never properly sealed during original construction or have degraded over time due to the local climate. Because of the heat-island effect and rooftop equipment exposure, ducts running through attics or unconditioned spaces suffer from extreme temperature swings. This causes the metal to expand and contract, eventually pulling apart at the seams and leaking conditioned air into the wrong places.
Another pattern I see frequently is 'duct leakage by design' in older multifamily properties. When ducts are tucked into tight mechanical closets or shared wall cavities, they are often crushed or improperly connected. If your HVAC system runs constantly but the rooms never quite reach the setpoint, it is rarely just the unit—it is usually the ductwork failing to deliver the air where it needs to go.
Working with Century City Architecture
Century City presents a unique mix of high-end condos, apartments, and older multifamily buildings. Many of these properties rely on compact mechanical closets or rooftop package units. When I work in these spaces, the primary challenge is accessibility. We often have to navigate tight service windows and shared building infrastructure to reach the ductwork that needs attention.
Because these buildings are often dense, the ductwork is frequently hidden behind finished ceilings or in restricted wall cavities. This is why we offer both manual mastic sealing for accessible areas and Aeroseal for internal, inaccessible leaks. We tailor our approach to the specific layout of your home, ensuring we get the job done without unnecessary demolition.
Our Diagnostic Approach
I do not guess when it comes to your home's performance. Every duct sealing project starts with a duct blaster test. This allows me to quantify exactly how much air is leaking out of your system as a percentage of total airflow. It gives us a baseline so we can prove the effectiveness of the work once we are finished.
During this diagnostic phase, I also inspect for crushed flex runs, insulation gaps, and register balance. If your return air sizing is inadequate, sealing the ducts might actually increase static pressure and damage your blower motor. I look at the whole system to make sure that sealing the leaks is the right move for your specific equipment.
Repairing vs. Replacing Ductwork
Sometimes, ductwork is simply too far gone to seal. If the flex duct is torn, moldy, or structurally collapsed, sealing it is a waste of your money. In those cases, I will be honest with you and recommend replacement instead of a patch job. My goal is to provide a permanent solution, not a temporary fix that will fail in a year.
If the ductwork is structurally sound but leaking at the joints, sealing is almost always the better financial decision. We use high-quality mastic that remains pliable for the life of the system. If the cost of the repair is high relative to the age of the system, we will discuss whether it makes more sense to bundle the duct work with a full system upgrade.
Understanding Costs and Value
The cost of duct sealing varies based on the size of your home and the accessibility of the ducts. Manual sealing of accessible joints typically ranges from $400 to $1,200, while Aeroseal for a full home can range from $1,500 to $3,000. I provide a written estimate after the initial diagnostic, so you know exactly what the investment is before we start.
While the upfront cost is an investment, the energy savings are real. By sealing 20–30% leakage, you can often reduce your HVAC energy use by 15–25%. At current electricity rates, many homeowners see a return on their investment within two years. Plus, if you are doing this as part of a larger HVAC replacement, it is often required for permit compliance anyway.
Access and Scheduling in Century City
Working in Century City means coordinating with HOAs, building management, and tenants. I understand that you cannot just have a contractor showing up at all hours. We work within your building's access windows and coordinate with site management to ensure we have the necessary clearance for rooftop units or mechanical room access.
Because I have 20+ years of hands-on experience, I know how to plan for these logistical hurdles. We arrive prepared with the right equipment for the job, whether it is a high-rise or a private residence. We respect your time and your building's rules, ensuring the work is completed efficiently and with minimal disruption.
Mistakes to Avoid
The biggest mistake I see is homeowners using standard silver 'duct tape' to seal their systems. That tape dries out, cracks, and falls off within a few years, leaving you with the same leaks you started with. We use professional-grade mastic that stays flexible and creates a permanent seal at every joint and plenum.
Another common error is ignoring the ductwork when installing a new, high-efficiency AC unit. If you put a brand-new, efficient system onto a leaky, unsealed duct system, you are essentially putting a high-performance engine into a car with a flat tire. You will never see the efficiency you paid for, and the unit will work harder than it needs to.
Health and Safety Considerations
Your indoor air quality is directly tied to your ductwork. If your ducts are leaking in an attic or crawl space, they are pulling in dust, insulation fibers, and allergens, then distributing them throughout your living space. Sealing these leaks prevents the system from 'breathing' the air from your attic or wall cavities.
We also prioritize safety during the sealing process. If we use Aeroseal, we ensure the home is properly prepared and that the system is tested before and after to ensure no particles are left in the airstream. As a CSLB-licensed contractor, I ensure that all work meets California safety codes, protecting both your home and your family.
Is Duct Sealing Right for You?
If your energy bills are high, your home has uneven temperatures, or you are planning to replace your HVAC system, duct sealing is a smart move. It is a one-time investment that improves the performance of your entire heating and cooling system for years to come.
If you are unsure, start with a diagnostic test. I will come out, test your system, and give you the data you need to make an informed decision. If the leaks are minor, we will tell you. If they are significant, we will show you the numbers and explain the best path forward.
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 complexity
- • Accessibility of ductwork (e.g., attic vs. finished ceiling)
- • Method of sealing (manual mastic vs. Aeroseal)
- • Current leakage percentage
Useful next steps
Duct Sealing in Century City at a glance
- • Duct Sealing provider: LC Heating & Air
- • Location served: Century City, CA 90067
- • 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 Century City
Reviewed by Leo, Owner & Lead Technician
This duct sealing guide for Century City 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 Century City customers say about duct sealing
Verified reviews from homeowners in Century City 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.”
