Fast, Reliable Duct Repair & Sealing Across Santa Monica
Duct repair and sealing in Santa Monica typically costs $280-$650 for most residential jobs, with same-day service available when you call before noon. Our Duct Repair & Sealing team has been driving to Santa Monica from our Los Angeles base since 1984, and we know the difference between a 1920s Spanish Colonial north of Montana Avenue and a 1960s rent-stabilized building off Wilshire Boulevard. That matters because the ductwork in those two buildings fails in completely different ways. Call (844) 685-6342 for a free estimate. We’ll be there when we say.
Why Bellows Air Duct & Vent Co. Is Santa Monica’s Preferred Duct Repair & Sealing Company
We’ve worked in Santa Monica long enough to recognize the telltale orange dust of corroded galvanized steel before we even open an access panel. Homeowners in the 90402 ZIP code and property managers along the Wilshire Corridor call us back because we show up with the right materials for coastal-grade repair, not inland-standard parts that fail again in two seasons.
Our response time to Santa Monica averages 45-60 minutes during business hours. Calls are answered by a live person, 24 hours a day. Not a voicemail. Not an app. A real person who can dispatch a background-checked, uniformed technician.
We’re not the cheapest option, and we don’t try to be. Our no-hassle upfront pricing means the number on the phone is the number on the invoice. No bait coupons, no price changes at the door. That’s been our founding promise since 1984, and it’s why Santa Monica customers who’ve been burned by discount operators stick with us.
Our Duct Repair & Sealing Services in Santa Monica
Metal Duct Repair
Santa Monica’s rent-stabilized apartment stock, concentrated along the Wilshire Corridor and south of Pico, often contains original sheet-metal ductwork from the 1950s-1970s that has never been professionally cleaned or sealed. We sealed a massive 1950s trunk-and-branch duct system at a rent-controlled 12-unit building on 6th Street near Santa Monica Blvd. The joints had opened from decades of corrosion, causing air loss and cross-contamination between units. We applied mastic sealant and metal tape to over 40 leak points, restoring HVAC balance and reducing tenant complaints. Metal duct repair in Santa Monica runs $320-$580 for typical residential trunk-line restoration.
Mastic Sealant Application
The marine layer that rolls in from the Pacific keeps Santa Monica’s building envelopes damp on most mornings, and standard duct tape simply dissolves under those conditions. We apply professional-grade mastic sealant rated for coastal humidity, using products from Abatement Technologies and Guardsman that remain flexible after curing. A typical mastic sealing job in a Santa Monica single-family home costs $280-$450, while multi-unit buildings with extensive trunk systems range $500-$900. Every application is camera-verified before we leave.
Air Leak Repair
Because Santa Monica temperatures rarely justify heavy A/C use, systems cycle infrequently. That leaves ducts in sustained low-airflow states where moisture and particulates settle instead of being flushed out. Leaks at register boots and plenum connections are the first failure point we find in coastal homes, especially in the 90403 and 90404 ZIP codes where 1970s construction used lower-grade sealing methods. Air leak repair typically runs $180-$340 per zone, with most Santa Monica homes needing two to three zones addressed.
Flex Duct Repair
Disconnected or crushed flex ducts in 1970s multi-family attics plague Santa Monica’s apartment stock, often hidden by ceiling insulation that property managers hesitate to disturb. We replace damaged flex runs with insulated duct rated for coastal conditions, and we document everything with before-and-after camera inspection. Flex duct repair in Santa Monica generally costs $220-$380 per run.
Duct Insulation
For homes north of Montana Avenue in 90402, where original 1920s-1940s construction often lacks any duct insulation at all, we install wrap insulation that combats the thermal bridging caused by Santa Monica’s persistent morning dampness. Duct insulation jobs start around $350 for partial systems and range to $750 for full replacement in larger homes.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Santa Monica
We stock parts and materials from Rotobrush, Abatement Technologies, and Aprilaire, the same brands serious HVAC contractors specify for coastal environments. For Santa Monica customers, that means faster turnaround. We don’t wait for parts to ship from a warehouse in Phoenix. Our trucks carry mastic sealants rated for marine-layer humidity, corrosion-resistant fasteners, and insulated flex duct that won’t collapse after one Santa Monica summer. When we repair ductwork in a 90404 apartment building or a 90401 bungalow, we’re using materials that were chosen specifically to outlast this climate.
Common Duct Repair & Sealing Problems We See in Santa Monica Homes
- Rusted-through seams in original galvanized ducts. Fifty-plus years of salt-laden marine air exposure eats through metal at joints and corners. We find this constantly in pre-1980 buildings south of Pico, where the combination of ocean proximity and rent-control-deferred maintenance has left ductwork actively deteriorating.
- Disconnected or crushed flex ducts in 1970s multi-family attics. These failures are often hidden by ceiling insulation and go unreported until one unit is heating another’s bedroom. The dense apartment stock in 90403 and 90404 makes this a recurring call for us.
- Mastic failure at register boot connections. Moisture cycling from the marine layer breaks down original sealant, and lack of maintenance in rent-stabilized units means nobody catches it until airflow drops by half. We reseal with coastal-grade mastic that flexes instead of cracking.
- Cross-contamination between units in multi-family buildings. When trunk-line joints open, air pressure differentials pull cooking odors, smoke, and particulates through shared ductwork. We’ve traced this in buildings from Ocean Park to the Wilshire Corridor.
Pricing for Duct Repair & Sealing in Santa Monica, CA
A typical duct sealing job in Santa Monica runs $280-$450 for a single-family home with accessible ductwork. Metal duct repair in older apartment buildings ranges $320-$580 for trunk-line restoration, while full multi-unit systems can reach $750-$1,200 depending on access and extent of corrosion. Flex duct replacement costs $220-$380 per run. Duct insulation for uninsulated 90402 homes starts at $350.
What moves the price: accessibility (attic vs. crawl space), extent of corrosion damage, number of leak points, and whether we need to coordinate with a property manager for multi-unit entry. We disclose everything before we start. The estimate is free, and our $50 Off Any Repair Over $250 standing offer applies to ductwork jobs that qualify.
We also honor our permanent 5% Senior and Veteran discount, and we provide a Free Second Opinion on Any Written Estimate if another company has quoted you. Call (844) 685-6342 for exact pricing for your Santa Monica home.
We Also Serve Cities Near Santa Monica
Our technicians regularly work in Santa Monica and the surrounding communities: Venice to the south, Pacific Palisades along the coast to the north, Culver City to the east, and Beverly Hills inland. The same marine-layer conditions that affect Santa Monica ductwork extend partially into Venice and Pacific Palisades, though with less intensity as you move inland toward Culver City. We carry the same coastal-grade materials on every truck, regardless of which city we’re headed to.
Serving Santa Monica, CA - Our Local Coverage Area
We’re based in the Santa Monica 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 - Duct Repair & Sealing in Santa Monica
Original sheet-metal ductwork from the 1950s-1970s in Santa Monica’s rent-stabilized buildings has often never been professionally sealed, and decades of salt-laden marine air have corroded joints open. Rent control enacted in 1979 suppressed renovation cycles, so landlords had limited incentive to maintain HVAC systems that still technically functioned. The result is widespread air leakage and cross-contamination that newer buildings with modern duct fabrication simply don’t experience. Call (844) 685-6342 for a free inspection of your building’s ductwork.
Yes, though the approach differs. Flex duct develops leaks at connection points rather than along its length, and Santa Monica’s marine-layer moisture degrades tape adhesives faster than inland climates. We seal flex duct connections with mastic and mechanical fasteners rated for coastal humidity, then verify with camera inspection. For flex duct in good condition, sealing typically costs $180-$320 and improves airflow immediately. If the flex is crushed or deteriorated, replacement makes more sense. We tell you which before we start.
The persistent marine layer in Santa Monica, locally called June Gloom, keeps relative humidity elevated on most mornings and dramatically so from May through September. Standard duct tape adhesive fails within months. We use mastic sealants from Abatement Technologies and Guardsman that remain flexible after curing, plus corrosion-resistant fasteners that won’t rust through in salt-laden air. Materials that work in the San Fernando Valley often fail here. We specify for coastal conditions because we have to.
A new HVAC system connected to leaky ductwork performs like a new car with flat tires. In Santa Monica specifically, where infrequent cycling leaves moisture in ducts, unsealed connections pull attic and crawl-space air into your conditioned space, undermining efficiency and indoor air quality. We camera-inspect ductwork before recommending sealing, and we often find that pairing a new system with proper sealing delivers the efficiency the manufacturer promised. Our $89 Seasonal Tune-Up includes a basic leak check if you’re unsure.
Often yes. Uneven temperatures in 1920s-1940s Santa Monica bungalows, especially north of Montana Avenue in 90402, usually trace to ductwork that was never properly balanced or has developed leaks over decades. Sealing restores designed airflow distribution so the system heats and cools as originally intended. We verify with before-and-after airflow measurements. For a typical 90402 bungalow, duct sealing and minor balancing runs $320-$480. Call (844) 685-6342 for an exact quote - estimates are free.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Santa Monica since 1984.