Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
Fast, Reliable Duct Sealing Across Temple City
Leaky ducts in Temple City mean you’re paying to heat and cool the crawlspace, the attic, or the dirt under your slab. The fix is sealing the actual leaks, not guessing. Duct Sealing in Temple City typically runs $450 – $1,800 depending on how much of the system is buried in concrete and how many runs need interior coating. Our crews work Temple City neighborhoods from the 91780 ZIP up through the Las Tunas corridor every week, and we schedule within a five-day window. Call (626) 469-5477 and you’ll get a live person who can book a camera inspection. Roy Castellanos runs our Temple City jobs personally, and he answers the phone.
Why Hollis Air Duct Pasadena Is Temple City’s Preferred Duct Sealing Company
Most Temple City homes we walk into were built between 1948 and 1965, and the ductwork is original. That means the leaks we find are predictable: rusted register boots, separated joints at the plenum, and return ducts cracked inside the slab. We know what to look for before the camera goes in. Our trucks carry sealing mastic, aerosol sealant, and replacement boots sized for the metal gauge used in post-war San Gabriel Valley construction, so most jobs are done in one visit.
Temple City customers call us because the price is written down before we touch the system. No per-vent games, no surprise line items at the door. Every job is covered by the 365-Day Done Right Promise: if the seal fails within a year, we return and fix it at no charge. That includes a free second visit, not a discounted one. We answer the phone 24/7, and the person who picks up can actually schedule a Temple City job, not just take a message.
Our technicians are background-checked, uniformed, and held to The Garrison Code: arrive inside the quoted window, price it in writing first, finish by the book, leave the site cleaner than we found it. If that sounds like basic professionalism, you’ve probably dealt with the other kind of crew. Roy Castellanos has been running our Temple City jobs since the start, and he knows the difference between a ranch on Oak Avenue and a two-story off Rosemead Boulevard.
Styles & brands we work with
Duct Repair in Temple City
Duct Repair in Temple City usually means fixing what 60 years of moisture and rust have done to metal that was never designed to be replaced. In slab-foundation homes, the return ducts run through the concrete. You can’t pull them out and drop in new flex. You repair what’s there, from the inside. That’s the job. It costs $350 – $900 for a typical single-run repair in Temple City, including materials and the camera verification pass afterward.
Slab-Duct Interior Repair
For return ducts embedded in concrete, the practical fix is interior coating with a mastic rated for damp metal. We inspect with a camera first, identify the breach, then coat the interior surface to seal cracks and pinholes. This is not a quick tape job. Tape peels off rusted slab interiors within months because the metal stays damp from ground moisture.
Register Boot Replacement
Floor registers in Temple City slab homes leak at the boot, the metal collar where the duct meets the register. Over decades, the connection rusts or separates. Replacing a boot costs $120 – $250 per register. It’s the most common repair we make in Temple City ranch-style homes, and it makes an immediate difference in airflow to individual rooms.
Air Duct Sealing in Temple City
Air Duct Sealing in Temple City is the actual fix for the dust, the rooms that never get cool, and the utility bill that climbs every July. The job: find every gap, crack, and separated joint in the system, then seal it with mastic or aerosol sealant from the inside. For a typical 1,500 – 1,800 square foot Temple City ranch with original metal ducts, whole-system sealing runs $800 – $1,500. That’s a real range, not a teaser number.
Aerosol Sealant Application
For accessible branch ducts in the attic or wall cavities, we use an aerosol sealant that pressurizes the system and deposits sealant at every leak point. It’s the same technology commercial buildings use, run through Nikro negative-air machines. The process takes about four to six hours for a standard Temple City home, and we verify the result with a before-and-after leakage test.
Manual Mastic Sealing
For visible joints at the plenum, supply runs, and the air handler, manual mastic is still the better tool. It’s a thick paste that dries hard and stays flexible. We apply it by brush to every accessible joint. On Temple City homes where the plenum sits in a closet or hallway, this is the single highest-return sealing job we do.
Trusted Brands We Service in Temple City
The sealing materials and equipment we run in Temple City are the same professional-grade tools commercial crews use. Rotobrush rotary brush systems for interior duct prep, Abatement Technologies negative-air machines for aerosol sealing, and filtration products from Guardsman and Honeywell on every job where air quality matters. We keep mastic, boots, and sealant on the truck for Temple City’s older gauge metal, which means we don’t leave a job half-done waiting on a part. If your system was installed with older sheet metal, we have what’s needed to seal it correctly the first time out.
See the difference
Before
After
Before
After
Before
AfterCommon Duct Sealing Problems We See in Temple City Homes
- Sealing tape over rusted slab interiors. Condensation from the concrete keeps the metal damp, and tape peels within months. Interior mastic is the only repair that lasts because it bonds to the metal, not the rust.
- Cracked thin-gauge ducts after aggressive cleaning. The original 1950s and 1960s ducts in Temple City are thinner than modern standards. Rough agitation during a clean cracks the walls, and a small leak turns into a split that has to be sealed from the inside.
- Unsealed register boots pulling moisture from the slab. Gap at the boot means air from the foundation cavity, with its moisture and radon potential, gets pulled into the house. Sealing the boots is a separate step from sealing the runs; skipping it undermines every other fix.
- Negative pressure from crushed return ducts. When a return under the slab gets crushed or cracked, the air handler pulls air through whatever gap it can find, usually fine dust from the concrete itself. The fix is interior reinforcement plus mastic at the breach.
Pricing for Duct Sealing in Temple City, CA
Here’s what we charge, written down, before any work starts. A single-run slab duct repair in Temple City: $350 – $900. Register boot replacement: $120 – $250 per boot. Whole-system sealing for a standard ranch-style home: $800 – $1,500. A full camera inspection with a written quote: free. What moves the number is access. A system with attic runs is faster than a slab-only return system because we don’t have to work through floor registers. The price is one flat number per system, agreed before the truck unloads. It does not change at the door. Call (626) 469-5477 and Roy will give you a straight range over the phone before we ever step inside.
We Also Serve Cities Near Temple City
If you’re in El Monte, San Gabriel, Arcadia, or Rosemead, we run the same crews and the same written-price standard. You get the full Temple City treatment: camera inspection, honest pricing, and the 365-Day Done Right Promise. No bait numbers, no per-vent games. Scheduling is coordinated from our Los Angeles office, and our trucks cover the entire San Gabriel Valley every week.
Serving Temple City, CA - Our Local Coverage Area
We’re based in the Temple City area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Duct Sealing in Temple City
We seal them from the inside. A camera goes into the return duct to locate the breach, then we apply a mastic coating rated for damp metal directly to the interior surface. This works because we’re not trying to wrap the outside of the duct, which is impossible once it’s encased in concrete. Call (626) 469-5477 for a free camera inspection and a written quote.
Yes, sealing reduces condensation, but it does not eliminate it. The condensation comes from warm house air hitting the cold concrete-encased metal. Sealing the duct reduces air leakage that carries moisture, but some condensation may still occur during humid winter months. For Temple City slab homes, the realistic goal is to stop the dripping and the rust it causes, not to create a perfectly dry duct. Call us and we’ll explain what sealing can and cannot do for your specific system.
Because the dust was entering the system downstream of the seal. In Temple City’s slab homes, the return ducts pull air from the foundation cavity through unsealed register boots and cracks in the concrete. If those gaps were not sealed as part of the job, dust from the slab gets drawn in continuously, no matter how clean or sealed the ducts themselves are. The fix is sealing the boots at every floor register, which we check by default. Call (626) 469-5477 if you’re seeing dust right after another company’s work.
No. The wall thickness in 1950s and 1960s Temple City ductwork is often 28-gauge or thinner, and aggressive rotary brushing cracks the metal, turning a small leak into a full split. We use gentler agitation methods sized for the gauge we find on the camera first. On the ranch home off Las Tunas Drive, our crew found a crushed return duct under the slab during a routine camera inspection. The homeowner’s air handler was pulling negative pressure through a gap in the concrete, sucking fine dust from the foundation. We sealed the breach with mastic, reinforced the duct interior, and verified airflow to every register with a blower motor test. That’s the careful approach these homes require.
Most ranch-style homes in Temple City run $800 – $1,500 for whole-system sealing. A single run repair runs $350 – $900. The range depends on how many ducts are in the slab versus accessible in the attic, and how many boots need replacement. We give you one flat price per system before work starts, and that number does not move. Call (626) 469-5477 and Roy will give you a real range over the phone, not a teaser.
Written by Roy Castellanos, Owner at Hollis Air Duct Pasadena, serving Temple City with written pricing and the 365-Day Done Right Promise since 2004.