Duct Repair & Sealing in New Braunfels - We Measure the Leak Before We Quote

Trusted Duct Repair & Sealing for New Braunfels Homeowners

Leaky ductwork in New Braunfels can waste 20-30% of your conditioned air before it ever reaches your rooms, which is why duct repair and sealing typically pays for itself within two to three years through lower utility bills. At CleanRun Air Duct Cleaning New Braunfels, we’ve sealed and repaired duct systems in more than 52,000 homes since 2013, and every job starts with a written price delivered before any work begins under Haven Standard Clause 1. If you’re wondering how much Duct Repair & Sealing costs, we’ll put that number in your hands before a single panel comes off. If your upstairs never cools evenly, your energy bills spike every August, or you feel weak airflow at registers in Timberwood Park or Canyon Lake, the problem is often in the ducts, not the HVAC unit itself. Call us at (830) 549-6847 and we’ll put a written estimate in your hands before a single panel comes off.

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What Our Duct Repair & Sealing Service Includes

Duct Sealing

Duct sealing closes the gaps, cracks, and separations in your supply and return trunk lines and branch runs that pull attic air into your system or push conditioned air into your crawlspace. In New Braunfels, we regularly find separations at plenum connections - the large metal box where your furnace meets the ductwork - caused by years of thermal expansion in our 100-degree summers followed by hard freezes in January. Our crews seal these joints with mastic compound and reinforced mesh, then pressure-test the system with a duct blaster to verify the leakage rate dropped below industry standards, and every sealed joint is photographed before and after for your documented photo record.

Flex Duct Repair

Flex duct, the insulated flexible tubing common in homes built from 1995 onward in neighborhoods like Veramendi and River Chase, collapses, tears, or disconnects at the collar when attic temperatures exceed 140 degrees or rodents find their way inside. We don’t patch flex duct with tape and hope; we cut back to solid, undamaged material and install a new section with mechanical collars and nylon draw bands rated for the pressure load. The repair is photographed, the R-value of the replacement insulation is matched to your existing runs, and the written scope specifies exactly which runs were replaced versus repaired so there’s no ambiguity in your job record.

Metal Duct Repair

Galvanized steel ductwork in older New Braunfels homes, particularly in the historic districts near Comal Avenue and Landa Street, rusts at the seams where condensation collects or develops whistling leaks from loose drive cleats. Our metal duct repair includes resealing longitudinal seams with S-cleats and drive clips, patching pinhole corrosion with 26-gauge galvanized patches riveted in place, and recoating interior surfaces where rust has compromised the metal. We use Nikro negative-pressure extraction equipment to capture rust particulate and debris during the repair so nothing circulates through your home when the system restarts.

Duct Insulation

Under-insulated or degraded duct insulation in your attic lets summer heat radiate directly into your cooled air stream, which is why rooms at the end of long duct runs often feel muggy even when the thermostat reads 72. In New Braunfels, where attic temperatures routinely reach 150 degrees from June through September, we replace compressed or moisture-damaged fiberglass insulation with formaldehyde-free duct wrap at the proper R-8 minimum for our climate zone, or we install closed-cell foam insulation on metal trunk lines where space allows. The insulation type and thickness are itemized in your written price, and we photograph the before condition so you can see what was costing you money every month.

Mastic Sealant

Mastic is a thick, water-based sealant that remains flexible after curing, which makes it the only acceptable method for sealing duct joints under Texas energy code standards - foil tape alone fails within three to five years in our heat. We brush mastic onto every joint, seam, and penetration in your duct system, then embed fiberglass mesh tape at stress points to prevent cracking during thermal cycling. Unlike quick-fix aerosol sealants that coat the interior of your ducts and can restrict airflow, our mastic application is external, targeted, and documented with close-up photos of each sealed joint in your delivered job record.

Air Leak Repair

Air leaks in your duct system aren’t always at the joints; we find penetrations where electricians or plumbers cut through trunk lines, gaps around filter racks where the blower compartment meets the return plenum, and disconnected boots behind registers that blow conditioned air into your wall cavities. Our diagnostic process starts with a visual inspection and smoke-pencil test to locate leaks, followed by pressure testing to quantify the total system leakage against the 12% maximum allowed for new construction in our region. Every leak location is noted in your written scope, the repair method is specified before work begins, and the after-test pressure reading is recorded to prove the fix worked.

Brands We Service for Duct Repair & Sealing

We’ve worked on duct systems connected to every major HVAC brand installed in New Braunfels homes over the past two decades. For Honeywell systems, including their whole-house media cleaners and electronic air cleaners integrated into the return ductwork, we verify that duct modifications maintain the manufacturer’s specified static pressure requirements so the air cleaner performs within warranty parameters. Our crews carry Honeywell-compatible transition fittings and have serviced hundreds of their units in Comal County subdivisions.

Aprilaire humidifiers and dehumidifiers mounted in duct plenums require precise sealing around their bypass ducts and drain connections to prevent water damage and mold growth, and we’ve repaired or resealed hundreds of these installations in homes from Selma to Bulverde. Whether your system is Honeywell, Aprilaire, Rotobrush-equipped, or any other make, we can repair and seal the ductwork it connects to. We don’t service the mechanical components inside furnaces or condensers, but we understand how ductwork must interface with them, and we’ll tell you before work starts if a mechanical issue needs an HVAC contractor’s attention.

Before

After

Signs You Need Duct Repair & Sealing Right Now

• Uneven temperatures from room to room. If your master bedroom in Fossil Ridge runs five degrees warmer than the hallway in July, the duct run serving that room is likely leaking or restricted. The conditioned air is escaping into your attic before it reaches the register, and your system runs longer to compensate, which shortens equipment life and raises your CPS Energy bill every month.
• Dust that returns within days of cleaning. When return ducts pull air from your attic or crawlspace through gaps in the trunk line, they bring fiberglass particles, rodent droppings, and pollen directly into your living space. In New Braunfels, where live oak pollen counts spike in March and mountain cedar in December, this means your home never stays clean and your family breathes what should be outside air.
• Whistling or rushing noises when the blower runs. High-velocity air escaping through a gap the size of a pencil creates a whistle that carries through drywall. We hear this complaint most often in two-story homes in Vintage Oaks and Copper Ridge, where the long vertical duct runs develop separations at the flex-to-metal connections under the stress of daily heating and cooling cycles.
• Utility bills that climb year over year despite no rate increase. A duct system leaking 25% of its air forces your HVAC equipment to run 25% longer to achieve the same temperature. In a New Braunfels summer, that can mean an extra $60-$120 per month on your electric bill, and the waste compounds every year as gaps widen and insulation degrades.
• Hot or cold spots near the ceiling in rooms with vaulted ceilings. Poorly sealed duct boots in cathedral ceilings allow attic air to convect downward through the register when the system is off, and conditioned air to escape upward when it’s running. This is common in custom homes near Canyon Lake and the Hill Country, where architectural details weren’t matched with proper duct detailing during construction.

Our Duct Repair & Sealing Process - Step by Step

1. 1
   Written estimate before any work begins. We inspect your accessible ductwork, identify the leak points or damage, and deliver a written price with line-item scope under Haven Standard Clause 1. No verbal quotes, no “we’ll see once we start,” no surprises. You’ll know exactly what we’re sealing, repairing, or replacing and what it costs before you decide.
2. 2
   Photographic documentation of existing conditions. Before a tool touches your system, we photograph every duct run, joint, and register boot we’ll be working on. These images go into your job record and are delivered with the after photos so you can see what was actually wrong, not just take our word for it. CleanRun has held this practice since our first job in 2013.
3. 3
   Targeted repair and sealing with trade-standard materials. We seal joints with mastic and mesh, repair or replace damaged flex duct with mechanical collars, patch metal with riveted galvanized steel, and replace degraded insulation with formaldehyde-free duct wrap. Every material is named in your written scope, and we use professional-grade equipment from Rotobrush, Nikro, and other trade-recognized manufacturers.
4. 4
   Pressure testing and airflow verification. After repairs, we run a duct blaster test or static pressure measurement to verify system leakage has dropped to acceptable levels and that airflow at each register meets the design standard for your home’s square footage. The test results are recorded in your job documentation.
5. 5
   Delivered photo record and 365-Day Done Right Promise. You receive before-and-after photos of every duct run we touched, a written summary of work performed, and the 365-Day Done Right Promise in writing. If the leak returns, the seal fails, or the repair doesn’t perform as specified, we make it right. This is a written guarantee, not a policy subject to manager approval.

How Much Does Duct Repair & Sealing Cost in New Braunfels?

Duct Repair & Sealing Near New Braunfels - Our Service Area

We repair and seal ductwork throughout Comal County and into Bexar and Guadalupe counties, including Duct Repair & Sealing in Cibolo, Duct Repair & Sealing in Seguin, and homes in Schertz, Selma, Universal City, Canyon Lake, Live Oak, Converse, Bulverde, Windcrest, and Timberwood Park. Most New Braunfels appointments are scheduled within three to five business days, and we carry common flex duct sizes, mastic, and collar fittings on every truck so repairs aren’t delayed by parts runs. For homes in the Hill Country or near Canyon Lake, where steep access and longer drive times apply, we build that into the written estimate upfront so there are no add-ons later.

Frequently Asked Questions - Duct Repair & Sealing in New Braunfels

Schedule Your Duct Repair & Sealing Service in New Braunfels Today

Call CleanRun Air Duct Cleaning New Braunfels at (830) 549-6847 for a written estimate at no cost and no obligation. Every estimate includes a documented photo record of your duct conditions, a line-item scope of recommended repairs, and the 365-Day Done Right Promise in writing before any work begins. We’re independently owned and operated under the Haven Standard, established in 2013, and we’ve delivered written prices and photo-documented results to more than 52,000 homes. All calls are answered by a live person, and our background-checked, uniformed technicians arrive identified by name. Get the exact price, see the actual condition of your ducts, and decide with evidence, not pressure.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning New Braunfels, serving New Braunfels, Cibolo, Seguin, and surrounding communities since 2013.