Fast, Reliable Duct Repair & Sealing Across Clovis
Duct repair and sealing in Clovis typically costs $280–$650 for most residential jobs, with flex duct replacement running higher depending on attic access, and we’re usually on-site within 45 minutes for Clovis calls. If your home was built during the 1970s ranch boom near Old Town or in the 2000s tract expansion across southeast Clovis, your duct system faces repair challenges that simply don’t exist in newer markets — sagging original flex, post-construction debris traps, and agricultural dust infiltration that accelerates wear.
We know the 93611, 93612, 93613, and 93619 ZIP codes because we’ve worked in them for 17 years. Ryan Bell — owner and lead technician — is the one who shows up, not a rotating subcontractor. From the mature neighborhoods along North Fowler Avenue to the newer developments off Clovis Avenue near Loma Vista, we’ve repaired ductwork in the homes you’re living in. Call (855) 643-8783 for a free estimate. We’re already familiar with your roofline, your attic layout, and the valley air that’s been cycling through your system since the day it was installed.
Why Redwood Air Duct Cleaning Service Fresno Is Clovis’s Preferred Duct Repair & Sealing Company
Our reputation in Clovis is built on showing up where we say we will and fixing what others patch. We carry 821 verified reviews at a 4.9-star average — one of the densest, highest-rated profiles in the duct-cleaning category — and a significant share of those come from Clovis homeowners who’ve watched us crawl through their attics, explain what failed, and seal it properly. You can check.
Response time to Clovis matters when your AC is pushing 100°F valley air through a torn duct run in August. We’re typically on-site within 45 minutes from our Fresno base, and we don’t charge mileage premiums for Clovis calls. Ryan Bell — owner and lead technician — is the one on your job, which means the most experienced person in the company is handling the repair, not a trainee learning on your drywall.
We understand the local housing stock because we’ve repaired it. The 1970s ranch homes with original flex duct that has sagged and degraded. The 2000s–2010s tract homes with extensive two-story duct systems where corner joints trap post-construction debris for years. The almond harvest dust that infiltrates through roof vents every August through October. This isn’t theoretical knowledge — it’s pattern recognition from 17 years of ductwork in the San Joaquin Valley.
Our Duct Repair & Sealing team handles everything from single flex duct runs to whole-system sealing with mastic, so you don’t need to call a second contractor.
Our Duct Repair & Sealing Services in Clovis
Flex Duct Repair
Clovis’s 1970s–1980s ranch homes in 93612 and 93611 are still running original flex duct in many cases, and that duct has reached the end of its service life. The fiberglass insulation degrades, the plastic liner tears, and the sagging creates low points where agricultural dust and attic particulate collect. We recently repaired a collapsed flex duct run in a 1978 ranch home on North Fowler Avenue in Old Town Clovis. The original uninsulated flex had sagged and torn, dumping attic dust into the living room supply grille. We replaced it with R-8 insulated flex duct and sealed all connections with mastic, restoring airflow and stopping the particulate intrusion. Typical flex duct repair or replacement in Clovis runs $320–$580 depending on run length and attic access.
Mastic Sealant Application
Metal duct connections in Clovis homes — especially the galvanized steel common in 1980s construction — develop gaps at joints and seams as thermal expansion and contraction work them loose over decades of 100°F summers. Mastic sealant is the only proper fix; foil tape degrades in attic heat within a few years. We apply professional-grade mastic to all accessible joints, creating a permanent seal that withstands the thermal cycling your Clovis attic experiences from May through September. Mastic sealing for a typical Clovis system runs $280–$420.
Duct Sealing & Air Leak Repair
Leaky ductwork in Clovis doesn’t just waste energy — it actively pulls valley air, agricultural dust, and wildfire particulate into your living space. The EPA and American Lung Association consistently rank the San Joaquin Valley among the worst regions in the nation for year-round particle pollution. Every gap in your return plenum or supply trunk is an entry point for that contamination. We pressure-test your system, locate leaks with smoke pencils and thermal imaging, and seal them with mastic or replace damaged sections. Whole-system sealing in Clovis typically ranges $450–$850 depending on system size and leak severity.
Metal Duct Repair
Older Clovis homes with galvanized steel trunk lines often show corrosion at condensate contact points or damage from decades of amateur HVAC modifications. We cut out corroded sections, fabricate replacement duct to fit, and seal with mastic — no duct tape, no shortcuts. Metal duct repair in Clovis runs $380–$720 depending on accessibility and extent of damage.
Duct Insulation
Uninsulated or degraded duct insulation in Clovis attics creates two problems: thermal loss that drives up your summer electric bills, and condensation that breeds microbial growth. We install R-8 insulation on flex duct replacements and wrap accessible metal runs with proper insulation blankets. Duct insulation work in Clovis typically adds $180–$340 to a repair job.
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 repair and seal duct systems connected to Honeywell, Aprilaire, and Abatement Technologies air quality equipment — brands we know from 17 years of installation and service work. We don’t just clean around your components; we understand how they integrate with your ductwork. For sealing and repair, we use professional-grade mastic and materials that meet the same standards, not hardware-store caulk that’ll crack by next summer. Because we stock common repair materials locally, most Clovis jobs are completed same-day without waiting on parts shipments from out of state.
Common Duct Repair & Sealing Problems We See in Clovis Homes
- Original flex duct from 1970s–1980s ranch homes sags and tears. The uninsulated or poorly insulated flex installed in Clovis’s first residential wave has degraded past repair in many cases, creating particulate intrusion paths that standard cleaning can’t address. Replacement with modern R-8 insulated flex is the only permanent fix.
- Post-construction drywall dust from 2000s tract homes remains trapped in corner joints. The extensive two-story duct systems in 93619 developments were rarely properly cleaned after construction, and that debris accumulates at low-velocity corners, restricting airflow and providing a substrate for microbial growth when condensation occurs.
- Almond harvest dust infiltrates attic spaces through roof vents and duct penetrations. August through October, the fields east and north of Clovis generate extraordinary dust clouds that find every gap in your attic envelope. We routinely find filters and duct debris that are visibly tan-gray from this agricultural particulate, and we seal penetrations with mastic to block future infiltration.
- Thermal expansion gaps in metal ductwork worsen under Clovis’s extreme summer cycling. Gallon-at-a-day AC runtime from May through September creates repeated expansion and contraction that loosens joints sealed decades ago with tape or inadequate mastic.
Pricing for Duct Repair & Sealing in Clovis, CA
We’re straightforward about what duct repair costs in this market because we want you to call with accurate expectations, not sticker shock.
| Service | Typical Range in Clovis |
|---|---|
| Mastic sealant application (joints & seams) | $280–$420 |
| Single flex duct run repair/replacement | $320–$580 |
| Metal duct section repair | $380–$720 |
| Whole-system duct sealing | $450–$850 |
| Duct insulation (add-on) | $180–$340 |
What moves you within these ranges: attic accessibility (tight truss spaces take longer), extent of contamination (harvest-season jobs often require more prep), and whether we’re repairing one run or sealing an entire system. Two-story homes in 93619 with ductwork above the second floor add ladder and safety time. We don’t upsell — if your 1979 flex duct can be spot-repaired, we’ll tell you. If it needs full replacement, we’ll show you why. Estimates are free. Call (855) 643-8783.
We Also Serve Cities Near Clovis
We repair and seal ductwork throughout the greater Fresno-Clovis metro, including Fresno proper, Old Fig Garden with its mature tree canopy and older housing stock, Sanger to the southeast, and Fowler to the south. Same response standards, same owner-led service, same valley-air expertise apply.
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
Original flex duct from 1979 is typically beyond spot repair — the fiberglass insulation has degraded and the plastic liner has become brittle after 45 years of attic heat cycling. We can sometimes patch a single tear if the surrounding duct is sound, but in most 93611 and 93612 ranches we service, full replacement with R-8 insulated flex duct is the only solution that stops particulate intrusion and restores proper airflow. Call (855) 643-8783 and we’ll assess your specific runs — estimates are free.
Yes, properly sealed and repaired ductwork typically improves AC efficiency by 15–30% by eliminating leaks that dump cooled air into your attic and draw in superheated attic air. In Clovis, where systems run 60–70 days above 100°F annually, that efficiency gain translates directly to lower electric bills and reduced compressor strain. We measure before-and-after static pressure to document the improvement. Call (855) 643-8783 for a free assessment.
Most Clovis homes benefit from duct inspection every 2–3 years, with sealing touch-ups as needed after the August–October almond harvest season. If you live east of Clovis Avenue or north of Herndon Avenue where harvest dust exposure is heaviest, annual inspection isn’t excessive — we often find new penetrations or degraded seals that developed over a single season. The post-harvest window of October–November is our busiest period for a reason. Call (855) 643-8783 to schedule after this year’s harvest settles.
We use Rotobrush and Nikro professional-grade duct-cleaning systems — the tools the industry actually specifies — for pre-repair cleaning and post-repair verification. For the repair and sealing work itself, we apply mastic by hand and use pressure-testing equipment to verify seal integrity. The Rotobrush and Nikro systems ensure we’re not sealing debris into your ducts. Call (855) 643-8783 to see the equipment in action on your job.
Yes, we regularly access and repair two-story duct systems in 93619 developments — it’s one of the most common calls we get from southeast Clovis. The ceiling space above your second floor typically contains flex duct runs to master bedroom or bonus room supplies, and we use ladder access and protective floor covering to reach these areas without damaging your interior. Repair cost typically runs $340–$520 depending on run length and whether we’re patching or replacing. Call (855) 643-8783 for a specific quote — estimates are free.
Ready to fix your ductwork? Call Redwood Air Duct Cleaning Service Fresno at (855) 643-8783 for a free estimate. Ryan Bell — owner and lead technician — handles every Clovis job personally, with 17 years of valley ductwork experience and 821 verified reviews you can check right now.
Written by Ryan Bell, Owner at Redwood Air Duct Cleaning Service Fresno, serving Clovis since 2008.