When Los Feliz residents need duct sealing, LC Heating & Air delivers same-day service backed by 20+ years of working in the LA market. Los Feliz is one of the most architecturally distinct neighborhoods in Los Angeles — home to a dense concentration of 1920s and 1930s Spanish Colonial Revival and Mediterranean-style homes, many with original plaster walls, tile roofs, and architectural features that make HVAC installation and ductwork routing genuinely challenging. LC Heating & Air has worked in Los Feliz homes for two decades and understands the unique requirements of older construction: how to run new ductwork without destroying original plasterwork, where to locate condensing units on tight hillside lots, and how to size systems correctly for older homes with different insulation and window characteristics than modern construction. That local knowledge means our technicians arrive knowing what equipment and access challenges to expect — cutting diagnostic time and getting repairs done faster.
### What Duct Sealing Accomplishes Duct sealing is one of the highest-ROI home energy improvements available to Los Angeles homeowners. When conditioned air leaks into attic or wall cavities before reaching the living space, you're paying to condition space you don't 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.
Overview
### Manual Sealing vs. Aeroseal LC Heating & Air offers two duct sealing approaches. Manual sealing uses mastic (a durable, flexible sealant applied by hand) and foil tape at accessible duct joints, take-offs, supply and return plenums, and connection points. This is the right approach when significant leakage locations are accessible and the duct system is in otherwise good structural condition. Aeroseal internal sealing is our solution for duct systems where significant leakage is distributed throughout the system in locations that aren't manually accessible — it seals from the inside out using a pressurized polymer aerosol that deposits on and seals leak sites as air passes through them.
### California Energy Code and Duct Sealing California Title 24 requires duct sealing testing (duct blaster test) as part of any HVAC replacement permit — and requires that systems failing the test be sealed to meet the leakage standard before permit signoff. If you've replaced HVAC equipment without a permit, or had a permitted replacement that failed to test the ducts, your system may have significant unsealed leakage.
### What You'll Notice After Duct Sealing Homeowners consistently report three immediate improvements after duct sealing: rooms that were previously hard to condition are now comfortable, the HVAC system runs for noticeably shorter cycles to reach the thermostat setpoint, and utility bills decrease. These improvements are permanent — properly applied mastic and Aeroseal are rated for the life of the duct system.
Local HVAC Challenges
Los Feliz's older housing stock presents three consistent HVAC challenges: original ductwork that is undersized for modern comfort expectations, plaster-and-lath construction that complicates new duct runs, and hillside lots with limited space for outdoor condenser placement. We use flexible installation approaches including mini-split systems for rooms that cannot be served efficiently by a central duct system, and we always photograph and document duct routing before closing walls so homeowners have records of what is in their walls.
Neighborhood Context
Many Los Feliz homes have partially original duct systems — galvanized steel trunk lines from original installations combined with flex duct extensions added in various decades. This patchwork ductwork is a common source of efficiency problems, hot and cold spots, and duct leakage. We assess the full duct system during every installation project and recommend consolidation or replacement when the existing ductwork would significantly compromise new equipment performance.
Why Choose Us
Call (323) 970-3113 for same-day duct sealing in Los Feliz. We answer 24/7 — emergencies and scheduled appointments alike. Licensed, insured, CSLB #1073586.
Our duct sealing process in Los Feliz
What Los Feliz customers say about duct sealing
Verified reviews from homeowners in Los Feliz and nearby neighborhoods who used our duct sealing service.
“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.”
“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.”