Duct Repair & Sealing in Katy - Leakage Measured, Then Priced in Writing

Trusted Duct Repair & Sealing for Katy Homeowners

If you’re wondering how much Duct Repair & Sealing costs, prices in Katy typically run $280-$850 depending on whether you’re sealing accessible joints or replacing collapsed flex runs, and most jobs are completed in a single visit with a written price agreed before any work begins. Since 2013, CleanRun Air Duct Cleaning Katy has documented the inside of every duct run we’ve touched with before-and-after photography, and we’ve served more than 52,000 homes under the H.A.V.E.N. Standard. Call us at (346) 666-7165 for a free written estimate, or bring a competitor’s quote for our Free Second Opinion.

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Katy homeowners who bought between 2015 and 2025 are finding that their duct systems weren’t built for the thermal stress of Gulf Coast summers. In neighborhoods like Cinco Ranch and Cinco Ranch, we’ve photographed flex duct that has literally pulled away from plenum connections (the central distribution box where heated or cooled air first enters the duct network) after five seasons of expansion and contraction. In older sections near downtown Katy, metal ductwork from the 1980s and 1990s shows corrosion at seams where condensation collects against uninsulated surfaces. The result is the same: conditioned air escapes before it reaches your rooms, your HVAC system runs longer cycles, and your utility bills climb without explanation.

We don’t sell urgency. We document what we find, put the repair scope and price in writing before touching a single panel, and back every job with the 365-Day Done Right Promise. Our technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. Every call is answered by a live person, 24/7.

What Our Duct Repair & Sealing Service Includes

Duct Sealing

Duct sealing closes the gaps, cracks, and disconnected joints that allow conditioned air to leak into your attic, crawl space, or wall cavities. In Duct Repair & Sealing in Katy, we regularly find that 20-30% of cooled air never reaches the intended rooms due to leakage at plenum connections and register boots (the metal box that transitions from duct to your floor or ceiling vent). Our crew uses mastic sealant and metal-backed tape rated for HVAC applications, not the cheap foil tape that degrades in attic heat. Every sealed joint is photographed before and after, and the images are delivered as part of your standard job record.

Flex Duct Repair

Flex duct, the insulated flexible tubing common in Katy homes built after 1995, collapses, tears, or pulls loose at connections over time. In Brookshire and Pecan Grove, we’ve replaced entire flex runs that squirrels or roof rats have chewed through in attic spaces. Our repair process involves cutting back damaged sections, installing new flex with mechanical connections rather than tape alone, and supporting the run with proper hangers to prevent future sagging. We use professional-grade materials from Abatement Technologies and Guardsman, and we photograph the full length of every repaired run.

Metal Duct Repair

Metal ductwork, found in Katy homes built before the mid-1990s, develops corrosion at seams and can separate at joints due to thermal expansion. We repair metal duct by cutting out corroded sections, fabricating replacement pieces from galvanized steel, and sealing with mastic and mechanical fasteners. In Mission Bend and New Territory, we’ve addressed metal duct that has literally rusted through at low points where condensation pools. Our crew carries sheet metal tools and stock to fabricate custom fittings on site, so we’re not making return trips because a part had to be ordered.

Duct Insulation

Uninsulated or degraded duct insulation allows thermal loss as air travels through unconditioned spaces. In Katy’s climate, where attic temperatures regularly exceed 130°F in July, this means your 55° supply air warms significantly before reaching the register. We install closed-cell insulation with proper vapor barriers, sealed at all seams, to maintain temperature integrity from plenum to register. In homes near Four Corners and Richmond Duct Repair & Sealing areas, we’ve measured temperature differentials of 8-12°F across poorly insulated duct runs, differences that disappear after proper insulation.

Mastic Sealant Application

Mastic is a thick, water-based sealant that remains flexible after curing, making it superior to tape for long-term duct sealing in Katy’s heat and humidity. We brush or trowel mastic over every joint, seam, and penetration in accessible ductwork, creating a continuous seal that tape alone cannot achieve. In our photo records, the difference is visible: taped joints show gaps within 3-5 years, while properly applied mastic maintains its seal for the life of the system. We use professional-grade mastic rated for HVAC applications, not hardware-store caulk that hardens and cracks.

Air Leak Repair

Air leak repair addresses the specific points where your duct system loses pressure, from disconnected boots to poorly sealed filter racks. We pressurize the system and use smoke pencils or theatrical fog to locate leaks that aren’t visible to casual inspection. In Jersey Village and Meadows Place, we’ve found that a significant portion of leakage occurs at the air handler cabinet itself, where the filter slot or blower compartment isn’t properly sealed. Every leak we identify is documented in your photo record, repaired, and verified before we leave.

Brands We Service for Duct Repair & Sealing

We’ve worked on duct systems connected to virtually every HVAC brand installed in Katy since 2013. On Honeywell systems, we’ve repaired and sealed ductwork integrated with their zoning controls, where precise airflow management makes leak-free distribution especially critical. In homes with Aprilaire whole-home dehumidifiers or air cleaners, we ensure that duct modifications maintain the specific static pressure requirements those accessories need to function properly. Our crew carries components compatible with these systems and documents any pressure readings taken during repair.

Whether your home has a Honeywell, Aprilaire, Carrier, Trane, Lennox, or any other make, we can repair and seal the ductwork that serves it. Our equipment roster includes Rotobrush inspection cameras that let us show you the inside of your ducts in real time, and Nikro negative-pressure extraction tools for jobs where repair reveals significant debris buildup. We don’t guess at compatibility, we verify it, and we photograph every connection we make.

Before

After

Signs You Need Duct Repair & Sealing Right Now

• Rooms that won’t hold temperature. If your west-facing bedroom in Katy stays 8°F warmer than the thermostat setting while the rest of the house cools fine, you likely have a disconnected or leaking duct run serving that room. We see this constantly in two-story homes where flex duct has pulled away from the plenum in the attic.
• Dust accumulation around registers. Excessive dust blowing from your vents often means your return duct is pulling air from a dusty attic or crawl space through a gap in the duct wall. In Pecan Grove and Mission Bend, we’ve found return leaks so severe the filter was clean while the duct interior was coated in fiberglass and attic debris.
• Utility bills that spike without explanation. A sudden 20-30% increase in your summer electric bill, with no change in rates or usage patterns, frequently traces to duct leakage that forces your AC to run longer cycles. We compare your system’s runtime data against the capacity loss we measure during inspection.
• Whistling or rushing air sounds. High-velocity airflow noise at registers usually indicates undersized or partially collapsed ductwork, or a system that’s pulling return air through a gap rather than through the intended path. In older Katy homes near downtown, we’ve traced whistling to metal duct seams that have opened from decades of vibration.
• Musty or chemical odors when the system runs. Smells entering your duct system from attic spaces, crawl spaces, or wall cavities mean your supply or return ducts have openings where they shouldn’t. In humid Katy summers, this also introduces moisture that supports mold growth inside the duct. Our cameras document the source, and our repairs seal it.

Our Duct Repair & Sealing Process - Step by Step

1. 1
   Written estimate before any work begins. We inspect your accessible ductwork with a Rotobrush camera, identify every leak, disconnected joint, or damaged section, and deliver a written scope with a fixed price. Haven Standard Clause 1 requires this, no exceptions. You’ll know exactly what we’ll do and exactly what it costs before we touch a single panel.
2. 2
   Photo documentation of existing conditions. Our technician photographs the inside of every duct run we’ll be working on, plus any visible damage in attics or crawl spaces. These images become the “before” portion of your Documented Photo Record, delivered as a standard part of every job.
3. 3
   Targeted repair and sealing. We execute the agreed scope: sealing joints with mastic, replacing damaged flex or metal sections, insulating bare runs, and verifying all connections with mechanical fasteners. Our crew works with professional-grade tools from Nikro and Abatement Technologies, and we test airflow at registers before considering the repair complete.
4. 4
   Post-repair verification and photography. We re-inspect every repaired run with the camera, photograph the completed work, and take pressure readings or temperature measurements where applicable. The “after” images are added to your record, showing the physical difference between what we found and what we left.
5. 5
   Written warranty and final documentation. You receive the complete photo record, a written summary of work performed, and the 365-Day Done Right Promise backed in writing. If anything in our repair fails within a year, we make it right. This isn’t a policy subject to manager approval, it’s a written guarantee on every job.

How Much Does Duct Repair & Sealing Cost in Katy?

Duct Repair & Sealing Near Katy - Our Service Area

CleanRun serves homeowners throughout Katy and surrounding communities including Cinco Ranch, Brookshire, Mission Bend, Pecan Grove, Four Corners, Richmond, New Territory, Jersey Village, Rosenberg, Meadows Place, and Sugar Land. Most scheduled repairs are completed within a single visit, and our technicians arrive with the tools and materials to handle common flex, metal, and sealing repairs without return trips. Whether you’re in a 2020 build in Cross Creek Ranch or a 1985 ranch near Katy Mills, we document what we find, quote the repair in writing, and guarantee the result.

Frequently Asked Questions - Duct Repair & Sealing in Katy

Schedule Your Duct Repair & Sealing Service in Katy Today

Call CleanRun Air Duct Cleaning Katy at (346) 666-7165 for your free written estimate. We’ll inspect your duct system with a camera, show you what we find, and deliver a flat price for the complete repair before any work begins. Every job includes the Documented Photo Record and the 365-Day Done Right Promise, backed in writing. No per-vent pricing, no post-arrival surprises, no exceptions.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Katy, serving Katy, Cinco Ranch, our Duct Repair & Sealing in Brookshire, and surrounding communities since 2013.