Fast, Reliable Duct Repair & Sealing Across Clovis
Duct repair and sealing in Clovis typically costs $280-$680 for most single-family homes, with same-day or next-day appointments available throughout 93611, 93612, 93613, and 93619. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Clovis from our Los Angeles headquarters for over 42 years to fix the specific duct failures this valley creates. You can reach us at (844) 685-6342 - a live person answers, 24 hours a day.
Clovis isn’t like other markets we serve. The master-planned subdivisions that exploded across eastern Clovis in the 1990s and 2000s were built with builder-grade flex duct and cheap mastic sealant, routed through attics that hit 150°F for months straight. That combination creates a predictable failure pattern we’ve seen hundreds of times. Our Duct Repair & Sealing team knows what to look for, and we show you on camera before we quote a dollar.
Why Bellows Air Duct & Vent Co. Is Clovis’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in the San Joaquin Valley on showing up when we say and standing behind the work. Our 90-Day Done Right Promise means if it’s not right, we make it right - no paperwork, no arguing. That promise is stamped on every job, and it’s why homeowners in Clovis call us back when their neighbors need help.
Our technicians are background-checked, uniformed, and equipped with Rotobrush agitation systems and camera inspection gear. Every job gets a before-and-after video record, not just a verbal claim. When we drive up to a home off Willow Avenue or in the Copper River Ranch area, we’re prepared for the specific duct conditions Clovis attics produce.
Calls to (844) 685-6342 are answered by a live person, not a voicemail tree or app. We offer $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount. Most Clovis repairs are completed in a single visit.
Our Clovis customers tell us the same thing: they called because they wanted the number on the phone to match the number on the invoice. That’s how we’ve operated since 1984.
Our Duct Repair & Sealing Services in Clovis
Flex Duct Repair
Flex duct repair is the most common call we get from Clovis, especially from homes built between 1995 and 2010 in 93619 and eastern 93611. Those subdivisions used corrugated flex duct with plastic collars and minimal support straps. After 15-20 years of thermal cycling in 150°F attics, the collars pull loose and the duct sags between joists. We recently repaired a 17-year-old flex duct system in the 93619 Copper River Ranch subdivision where sagged runs and failed mastic seals were pulling almond orchard dust and fiberglass insulation from the attic into every room. Using Rotobrush agitation and Guardsman mastic sealant, we re-sealed all 12 collars and insulated the exposed trunk with R-8 wrap, dropping the homeowner’s PM2.5 complaint and summer cooling load in one sweep. We replace damaged flex runs, re-secure supports, and restore proper airflow without tearing out walls.
Mastic Sealant Application
Builder-grade mastic sealant dries and cracks within a decade under San Joaquin Valley heat. We remove the failed material and apply fresh, fiber-reinforced mastic rated for extreme temperature cycling - the same product serious HVAC contractors specify for Central Valley conditions. Every joint and seam gets brush-applied coverage, not spray shortcuts. In Clovis, where systems run almost continuously from May through October, a proper mastic seal is the difference between conditioned air reaching your rooms and paying to cool your attic.
Metal Duct Repair
Older Clovis homes and custom builds sometimes use galvanized metal trunk lines. We repair separated seams, patch corrosion holes, and replace damaged sections. Metal duct in Clovis faces a specific stress: thermal expansion from extreme attic temperature swings creates seam fatigue faster than in moderate climates. Our repairs account for that movement with proper expansion joints and sealant selection.
Duct Insulation
After repair, exposed ductwork in Clovis attics needs insulation that can handle the heat. We use R-8 fiberglass wrap with reinforced foil facing, properly sealed at all seams. In 93619 homes with long attic runs, this insulation upgrade typically pays for itself in reduced cooling load within two summers. The alternative - bare or poorly insulated duct in a 160°F attic - is like trying to push cold air through a heated pipe.
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 Clovis
We specify equipment from Rotobrush, Abatement Technologies, and Aprilaire - the same brands Clovis HVAC contractors use in new construction. We keep common flex duct sizes, collar fittings, and mastic compounds stocked for fast turnaround on Clovis jobs. No waiting for parts to ship from out of state while your system runs inefficiently. Our technicians arrive with what they need to complete most repairs in one visit, including camera inspection gear to verify the fix before we leave.
Common Duct Repair & Sealing Problems We See in Clovis Homes
- Flex duct collars pulling loose in 93619 attics. After 15-20 years of 150°F thermal cycling, the plastic or metal collars securing flex duct to plenums and registers separate. This creates a direct path for blown-in attic insulation fibers and agricultural dust into living spaces - a failure mode our cameras catch frequently in Copper River Ranch and adjacent subdivisions.
- Cracked builder-grade mastic at every joint. The thin mastic applied during the housing boom dries to a brittle film under San Joaquin Valley heat. We find gaps and cracks at trunk line seams, branch takeoffs, and register boots that leak conditioned air into attics for years before homeowners notice the comfort or cost impact.
- Sagged flex duct trapping moisture and debris. Inadequate support straps in boom-era Clovis homes let flex duct sag between joists. Low spots collect condensation during shoulder seasons and become debris traps that restrict airflow and support microbial growth - a problem worsened by the valley’s heavy HVAC use.
- Insulation degradation from extreme attic heat. Original R-4 or R-6 duct insulation in Clovis attics compresses and separates from the duct jacket over time. Exposed flex duct in a 160°F attic loses cooling capacity before the air reaches your vents, forcing longer run times and higher bills.
Pricing for Duct Repair & Sealing in Clovis, CA
Most Clovis homeowners pay between $280 and $680 for duct repair and sealing, depending on system size, accessibility, and the extent of damage we find on camera inspection. Here’s how typical projects break down:
- Single flex duct run repair/replacement: $280-$420
- Mastic re-sealing of full system (average 3-4 ton home): $380-$580
- Flex duct collar repair and re-secure (per collar): $85-$140
- Duct insulation wrap upgrade (R-8, full system): $520-$780
- Combination repair + sealing + insulation package: $680-$1,200
What moves you within these ranges: attic accessibility (blown-in insulation adds time), number of damaged runs, whether register boots need replacement, and if we discover disconnected returns behind drywall. We show you the camera footage, explain what we found, and give you the full price before we start. No bait coupons, no price changes at the door. We also honor $50 off any repair over $250, and estimates are always free. Call (844) 685-6342 for an exact quote on your Clovis home.
We Also Serve Cities Near Clovis
Our service area extends throughout the San Joaquin Valley. We regularly complete Duct Repair & Sealing in Clovis and also handle calls from Fresno, Sanger, Bonadelle Ranchos-Madera Ranchos, and Parlier. Same standards, same camera verification, same upfront pricing - no matter which city you’re calling from.
Serving Clovis, CA - Our Local Coverage Area
We’re based in the Clovis 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 Clovis
Significant amounts, especially if your flex duct collars have failed. In 93619 and eastern 93611, where homes back directly against active agricultural land, our cameras regularly show almond orchard dust, field-stir particulates, and fiberglass insulation fibers collecting in duct runs and on evaporator coils. The San Joaquin Valley’s thermal inversion traps these particles at ground level, and any gap in your duct system becomes an intake point. Sealing those gaps with proper mastic and repairing damaged flex runs stops the infiltration. Call (844) 685-6342 for a camera inspection - estimates are free.
Most Clovis flex duct can be repaired if the damage is limited to loose collars, sagged runs, or localized tears. We replace individual damaged sections and re-seal connections rather than tearing out entire systems. Full replacement becomes necessary when the duct material itself has degraded from prolonged heat exposure or when multiple runs show brittle, crumbling jackets - typically in systems older than 25 years. Our camera inspection shows you exactly which condition you’re in. Call (844) 685-6342 for a free assessment.
R-8 fiberglass wrap with reinforced foil facing, properly sealed at all seams. In Clovis attics that reach 150-160°F, lower R-value insulation compresses and loses effectiveness within a few seasons. We specify the same R-8 product that HVAC contractors use for new Central Valley installations, and we verify complete coverage with our inspection camera before we leave. The upgrade typically reduces cooling load enough to recover its cost in two summers. Call (844) 685-6342 for pricing on your system.
We don’t recommend spray foam for duct sealing in Clovis. Spray foam expands unpredictably, can obstruct dampers and registers, and degrades differently under extreme thermal cycling than fiber-reinforced mastic. Brush-applied mastic allows controlled coverage at every joint, remains flexible across temperature swings, and is the standard specified by Abatement Technologies and other professional-grade manufacturers we use. For Clovis’s 150°F attic conditions, mastic is the proven material. Call (844) 685-6342 and we’ll show you the difference on camera.
Yes, if your duct system has leaks that pulled smoke-laden air into the return side or allowed attic infiltration during wildfire events. The Central Valley’s thermal inversion traps wildfire PM2.5 for days or weeks, and any gap in your ductwork becomes a pathway for those particles to recirculate. Sealing all joints with proper mastic, repairing disconnected returns, and upgrading filtration stops the reintroduction of smoke particulates. We also offer air quality and sanitizing services for persistent odor issues. Call (844) 685-6342 to discuss whether sealing or a combined approach fits your situation.
Ready to fix your Clovis duct system? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate. We’ll show you what the camera sees, give you one honest price before we start, and stand behind the work with our 90-Day Done Right Promise - in writing, no arguing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Clovis since 1984.