Duct Repair & Sealing in San Bernardino - Same-Day Service, Done Right the First Time

Fast, Reliable Duct Repair & Sealing Across San Bernardino

Duct repair and sealing in San Bernardino typically costs $180-$650 depending on whether we’re patching a few joints with mastic or replacing collapsed flex-duct runs in a crawl space. Most jobs are completed in a single visit, and we answer our phones live 24 hours a day at (844) 685-6342.

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We’ve been driving out to San Bernardino since 1984, and we know the difference between a 1970s tract in the 92407 ZIP code and a 1950s ranch on the Westside where the original gravity furnace got patched into forced-air sometime in the Reagan administration. That history lives in your walls. It matters for how we approach the job, what parts we bring, and whether we’re sealing existing metal or pulling out rodent-chewed flex duct that’s been dumping crawl-space debris into your living room for twenty years.

Why Bellows Air Duct & Vent Co. Is San Bernardino’s Preferred Duct Repair & Sealing Company

San Bernardino homeowners call us back because we show up when we say we will, we explain what we’re doing before we do it, and we put our 90-Day Done Right Promise in writing on every invoice. No paperwork to file if something isn’t right. We just come back and fix it.

Our technicians are background-checked, uniformed, and equipped with camera inspection gear from Rotobrush and Nikro. We photograph your ductwork before we touch it and after we’re done. You see what we see, not just what we say.

We answer our phones live, 24/7. Not an app. Not a voicemail tree. A real person at our office who can dispatch a crew to San Bernardino today if your AC is blowing dust or your crawl-space duct has collapsed in July heat.

Ray Castillo, who leads Bellows Air Duct & Vent Co., set the standard in 1984: one honest price shown before work starts, no bait coupons, no price changes when we walk through your door. That standard hasn’t changed in over 42 years.

Our Duct Repair & Sealing Services in San Bernardino

Duct Sealing

San Bernardino’s summer AC run-times are among the longest in Southern California, with valley highs pushing past 105°F for weeks at a stretch. Every cubic foot of cooled air that leaks through degraded mastic or separated joints is air your compressor worked hard to produce. We seal metal duct seams and connections with professional-grade mastic sealant, not tape that dries and fails in attic heat. In the older homes near Base Line or along Highland Avenue, we regularly find original 1950s-60s sheet metal where the mastic has turned to dust. We clean the joint, apply fresh mastic, and mechanically secure it so it holds through the next four decades of San Bernardino summers.

Flex Duct Repair

Flex duct is the weak link in most San Bernardino retrofit systems. In the Westside and north neighborhoods, particularly around 92411 and 92405, we encounter flex-duct runs installed decades ago when gravity furnaces were converted to forced-air, often strung through vented crawl spaces with no insulation, no protection, and no rodent barrier. The inner liner collapses. The fiberglass insulation gets soaked with soil moisture. Rodents chew through the vapor barrier. We recently repaired a flex-duct system in a 1960s ranch house on West 17th Street in the 92405 ZIP code. The original sheet-metal supply trunk was intact, but the crawl-space runs of uninsulated flex duct, added by a previous owner to convert from a gravity floor furnace, had been chewed through by rodents and partially collapsed, dumping debris directly into the conditioned air. We removed the damaged sections, replaced them with insulated R-8 flex duct, and sealed all connections with mastic. The homeowner noticed the difference in air quality that same afternoon.

Metal Duct Repair

The post-WWII tract homes and ranch houses that dominate San Bernardino’s housing stock were built with galvanized sheet-metal ductwork that can last a century if properly maintained. The problem is maintenance. Decades of filter neglect, particulate loading from the basin’s poor air quality, and thermal cycling have left many supply trunks with rust spots, separated seams, and collapsed internal dampers. We repair metal duct by cutting out damaged sections, fabricating replacement pieces on-site, and sealing with mastic and mechanical fasteners. Where the original metal is sound but the connections have failed, we can often restore full system integrity without replacing the entire run.

Duct Insulation & Mastic Sealant

San Bernardino’s thermal-basin geography means attics hit 140°F in July. Uninsulated or poorly insulated ductwork in those attics acts like a radiator in reverse, bleeding cooled air into the void before it ever reaches your registers. We install proper R-8 insulation on flex-duct replacement runs and apply mastic sealant at every connection point. For metal trunks in attic spaces, we assess whether the original asbestos-containing duct wrap can be safely left in place or whether full replacement with modern materials is the cleaner long-term solution. We don’t guess. We camera-inspect, we show you the footage, and we quote the work before we start.

Trusted Brands We Service in San Bernardino

We stock parts and materials from Honeywell, Aprilaire, and Nikro on every San Bernardino service truck. That means when we find a failed component in your duct system, we’re not ordering parts for next week. We’re fixing it today. Honeywell media air cleaners and Aprilaire humidifier components integrate cleanly with existing forced-air systems in the 1950s-70s homes that make up so much of San Bernardino’s stock. Nikro’s camera inspection and HEPA vacuum equipment lets us verify our work visually and leave your home cleaner than we found it. We don’t show up hoping we have what you need. We know.

Common Duct Repair & Sealing Problems We See in San Bernardino Homes

• Degraded mastic at joints in pre-1970 homes. The original sealant has dried, cracked, or fallen away entirely, pulling unfiltered attic or crawl-space air directly into your supply ducts. In San Bernardino’s particulate-heavy airshed, this means your AC is distributing everything from Mojave dust to wildfire ash into your bedrooms.
• Disconnected or crushed flex-duct runs in crawl spaces. Common in older retrofitted systems where gravity furnaces were replaced with forced-air. The flex gets kicked, settles onto damp soil, or gets chewed. We find runs in the 92411 ZIP code that have been dumping conditioned air into the crawl space for years while the homeowner pays $400 electric bills in August.
• Collapsed inner liner in fiberglass-lined metal ducts. Materials degrade over decades, especially under the thermal stress of San Bernardino’s 100°F+ summers. The liner releases glass fibers and traps debris, creating a reservoir of contamination that standard duct cleaning cannot fully remove.
• Filter breakthrough from extended high-load operation. San Bernardino systems run five to six months at full capacity against extreme heat, often with pleated filters loaded past their rated capacity. Dirty filters collapse, bypassing unfiltered air that accelerates duct contamination and can damage the blower motor.

Pricing for Duct Repair & Sealing in San Bernardino, CA

We Also Serve Cities Near San Bernardino

Our crews run regular routes to San Bernardino, Rialto, Bloomington, Fontana, and Rubidoux. If you’re in the broader Inland Empire and your ductwork is leaking, crushed, or blowing dust, we’ll come out and give you a straight answer about whether it needs sealing, repair, or replacement. Same-day appointments are often available.

FAQs - Duct Repair & Sealing in San Bernardino