Duct Repair & Sealing in Round Rock - Tested First, Written Price Second

Trusted Duct Repair & Sealing for Round Rock Homeowners

Our Duct Repair & Sealing in Round Rock typically costs $280-$890 depending on whether you’re sealing accessible joints or replacing collapsed flex runs, and most jobs are completed in a single visit. CleanRun Air Duct Cleaning Round Rock has documented the inside of every duct run we’ve touched since 2013, with 52,000+ homes served under the Haven Standard. If your upstairs never cools evenly, your energy bills have climbed without explanation, or a vent blows lukewarm air while the system runs full blast, the problem is likely in the ductwork itself, not the HVAC unit. Call (737) 259-5752 for a free written estimate with your price locked before any work starts.

Call (737) 259-5752

Round Rock’s expansion from 2015 to 2025 added thousands of homes in neighborhoods like Behrens Ranch, Paloma Lake, and Forest Creek, many with flex duct runs in attics that hit 140°F in July. That heat cycling degrades connections at the plenum, the main trunk where all ducts originate, and at every register boot where the duct meets the wall or ceiling. We’ve photographed separated joints in Mayfield Ranch homes where the homeowner’s only symptom was a $400 summer electric bill. The camera doesn’t lie, and neither does a written price delivered before a single panel comes off.

What Our Duct Repair & Sealing Service Includes

Duct Sealing

Duct sealing closes the gaps and leaks in your supply and return ductwork, the pathways that carry conditioned air from your HVAC unit to each room. In Round Rock, we regularly find 15-30% air loss in homes built during the 2015-2020 boom, where speed of construction often meant taped joints that failed within five years. CleanRun uses mastic sealant, a thick paste brushed onto joints that hardens into a permanent airtight bond, plus metal-backed tape rated for high-temperature attics. Every sealed joint is photographed before and after, and the photo record is delivered with your job documentation.

Flex Duct Repair

Flex duct, the ribbed plastic tubing wrapped in insulation that connects your plenum to each room, collapses, tears, or disconnects when attic heat or pest activity degrades the material. In Wells Branch and Brushy Creek, we see kinked flex runs where installers took tight corners to save time, restricting airflow by 40% or more. Our crews replace damaged sections with new insulated flex duct sized to match your system’s CFM rating, cubic feet per minute, the measure of airflow your HVAC was designed to move. We support every new run with proper straps to prevent sagging, and photograph the full length before closing the attic.

Metal Duct Repair

Metal ductwork, found in older Round Rock homes and in commercial buildings, corrodes at seams and can separate at joints due to thermal expansion. We’ve repaired galvanized steel trunk lines in Jollyville homes where rust holes allowed attic insulation to enter the airstream, visible as gray dust at the registers. CleanRun patches small breaches with sheet metal and sealant, replaces severely corroded sections with matching gauge material, and verifies airflow balance with a manometer, a pressure gauge that measures static pressure in inches of water column. The reading is recorded in your job file.

Duct Insulation

Duct insulation wraps your metal or flex ducts to prevent thermal loss as conditioned air travels through unconditioned spaces like attics and crawl spaces. In Round Rock’s climate, where attic temperatures exceed 130°F for weeks each summer, uninsulated or degraded insulation forces your HVAC to work harder to deliver 55°F air to your vents. We install foil-faced fiberglass insulation at R-6 or R-8 value, the thermal resistance ratings required by Texas energy code, and seal every seam with pressure-sensitive tape. The result is air that arrives at the register at the temperature your thermostat requested.

Mastic Sealant

Mastic sealant is the industry-standard material for permanent duct sealing, applied as a thick liquid that cures to a flexible, airtight membrane. Unlike duct tape, which degrades in heat and loses adhesion within months, mastic remains effective for decades. CleanRun crews brush mastic onto every joint, seam, and penetration in your duct system, including the connection between the air handler and the plenum, a common leak point we photograph on nearly every job. The application is messy and slow, which is why cheap competitors skip it; we include it as standard practice under Haven Standard Clause 1.

Air Leak Repair

Air leak repair targets the specific breaches where conditioned air escapes into your attic, crawl space, or wall cavities, or where unconditioned air is drawn into your return ducts. In Pflugerville and Hutto homes, we’ve found return leaks pulling fiberglass insulation and rodent droppings directly into the breathing air. Our diagnostic process uses a smoke pencil and blower door testing to locate leaks invisible to the eye, then seals them with the appropriate method for each location. Every repaired leak is documented in your photo record with a description of what was found and what was done.

Brands We Service for Duct Repair & Sealing

CleanRun crews are trained on duct systems paired with Honeywell zoning controls, which use motorized dampers to direct airflow to specific zones of your home. We’ve repaired and sealed ductwork in dozens of Round Rock homes with Honeywell TrueZONE panels, where improper duct sealing caused zone pressure imbalances that triggered error codes. Our technicians carry the diagnostic tools to verify that your duct repairs restore proper static pressure for these systems, and we document the before-and-after readings in writing.

We also regularly service ductwork connected to Aprilaire whole-home dehumidifiers and air cleaners, common in Georgetown and Cedar Park installations where tight building envelopes require precise airflow management. The duct connections to these accessories are frequent leak points because they’re added after the original HVAC installation. Whether your system includes Aprilaire, Honeywell, or any other make, we can inspect, repair, and seal the full duct network. Our equipment roster includes Nikro and Abatement Technologies tools for negative-pressure extraction and verification testing, brands you can verify independently.

Before

After

Signs You Need Duct Repair & Sealing Right Now

• Uneven temperatures between rooms. If your master bedroom in Behrens Ranch runs 8°F warmer than the hallway in July, the duct run serving that room is likely leaking, collapsed, or disconnected at the boot. Your HVAC unit is producing enough cold air; it’s just not arriving where you need it.
• Dust accumulation immediately after cleaning. A home in Paloma Lake we serviced showed thick gray dust on furniture within 48 hours of professional cleaning. The camera revealed a return duct leak in the attic pulling fiberglass and cellulose directly into the air handler.
• Energy bills that rise without rate increases. When duct leaks force your system to run longer cycles to reach set temperature, your kilowatt-hour usage climbs even if the thermostat never changed. We’ve seen $200+ monthly reductions in Round Rock after sealing leaks the homeowner didn’t know existed.
• Hissing or whistling from vents or walls. Air escaping at high velocity through a small gap creates audible noise. That sound is conditioned air you paid to cool or heat disappearing into your wall cavities. The leak is often accessible and sealable in a single visit.
• Musty or chemical odors when the system runs. Leaks in return ducts can pull air from musty crawl spaces, rodent-affected attics, or areas where stored chemicals off-gas. The odor is a warning that your ductwork is drawing from places it shouldn’t.

Our Duct Repair & Sealing Process - Step by Step

1. 1
   Written estimate delivered before work begins. Our technician arrives in a CleanRun uniform, introduces themselves by name, and inspects your accessible ductwork with a borescope camera, a flexible camera that travels inside the duct. We show you what the camera found, explain the scope of repair, and deliver a written price under Haven Standard Clause 1. No work starts until you have that number in hand.
2. 2
   Full system diagnostic with photo documentation. We photograph every duct run, plenum connection, and register boot before touching anything. The photo record becomes part of your permanent job file, dated and labeled by location. If we’re sealing, we perform a smoke test or pressure test to quantify leakage in CFM.
3. 3
   Repair and seal using trade-specified methods. Flex duct is replaced with properly sized material and supported to prevent sag. Metal joints are patched or replaced and sealed with mastic. Insulation is installed to Texas code minimums. Every material is named in your written scope.
4. 4
   Post-repair verification and airflow check. We run the system and verify temperature delivery at each register with a digital thermometer, comparing readings to your pre-repair baseline. Static pressure is measured and recorded. The numbers either improve or we find out why.
5. 5
   Deliver your documented photo record and written warranty. Before leaving, the crew provides your complete job file: before-and-after photos of every duct run, the written scope of work, static pressure readings, and the 365-Day Done Right Promise in writing. This is standard on every visit, not an upgrade.

How Much Does Duct Repair & Sealing Cost in Round Rock?

Duct Repair & Sealing Near Round Rock - Our Service Area

CleanRun serves homeowners throughout the greater Round Rock area, including Duct Repair & Sealing in Brushy Creek, Duct Repair & Sealing in Wells Branch, and communities from Pflugerville and Hutto to Cedar Park, Leander, Georgetown, Manor, Taylor, and Austin. Most Round Rock appointments are scheduled within two business days, with written confirmation sent by text and email. Our technicians live in the communities they serve, so they know the construction patterns: the flex-duct-heavy builds in Forest Creek, the metal trunk lines in pre-2000 Jollyville, the tight envelopes in Teravista that make airflow balance critical.

Frequently Asked Questions - Duct Repair & Sealing in Round Rock

Schedule Your Duct Repair & Sealing Service in Round Rock Today

Call (737) 259-5752 to speak with a live person, schedule your free estimate, and receive a written price before any work begins. Every job includes a Documented Photo Record of every duct run, the 365-Day Done Right Promise in writing, and service from background-checked, uniformed technicians operating under the H.A.V.E.N. Standard. No coupons, no urgency theatre, no surprises; just documented work at a price you agree to in advance.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Round Rock, serving Round Rock and surrounding communities since 2013.