Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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Before
AfterTrusted Duct Repair & Sealing for Houston Homeowners
Duct repair and sealing in Houston typically costs $450-$1,800 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 work starts. See how much Duct Repair & Sealing costs for a detailed breakdown. Since 2013, CleanRun Air Duct Cleaning Houston has repaired and sealed ductwork in more than 52,000 homes across the metro, every one with a documented photo record delivered at completion. Call (346) 251-8919 for a free written estimate.
Houston’s climate puts unique stress on residential duct systems. The combination of extreme summer heat, high humidity, and expansive clay soils creates pressure cycles that loosen mastic seals, sag flex duct in attics, and corrode metal connections in crawl spaces. We’ve found separated duct runs in The Heights where cooled air was dumping directly into attic insulation, and we’ve sealed leaky plenums (the main distribution box attached to your air handler) in Sugar Land homes where the homeowner had been cooling their attic for three summers without knowing it. We also provide our Duct Repair & Sealing in Houston metro-wide. Our crews carry Rotobrush inspection cameras and Nikro negative-pressure equipment on every truck, and every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews.
We don’t offer $79 coupons or quote prices over the phone without seeing the system. Haven Standard Clause 1 requires a written price before any work starts, every time, with no exceptions. You’ll see what we find before we recommend anything.
What Our Duct Repair & Sealing Service Includes
Duct Sealing
Duct sealing closes the gaps, cracks, and disconnected joints that leak conditioned air into your walls, attic, or crawl space. In Houston, we most often seal supply plenums and trunk lines where thermal expansion has broken original mastic bonds, particularly in homes built between 2010 and 2020 when fast construction schedules left many joint connections incomplete. CleanRun crews use pressure-sensitive foil tape rated for HVAC applications, followed by brush-applied mastic sealant that remains flexible through Houston’s freeze-thaw cycles. We test our work with a duct blaster or calibrated airflow hood when accessible, and we photograph every sealed joint for your job record.
Flex Duct Repair
Flex duct, the insulated flexible tubing common in Houston attics since the 1990s, collapses when hangers fail, gets punctured by roofing nails or rodent activity, and degrades where it contacts hot roof decking. We regularly find fully collapsed flex runs in Missouri City and Fresno homes where the homeowner’s only symptom was a warm bedroom that never cooled properly. We also handle Duct Repair & Sealing - Pasadena and surrounding areas. CleanRun repairs involve replacing damaged sections with new R-8 insulated flex duct, supporting it with proper tension straps at maximum 4-foot intervals per manufacturer specification, and sealing connections with metal sleeves and mastic. We photograph the damaged section before removal and the completed repair before we leave the attic.
Metal Duct Repair
Galvanized steel ductwork, still common in Houston homes built before 1990 and in custom construction throughout Bellaire and West University, corrodes at seams where condensation collects and can separate at drive cleat connections during foundation settling. We offer our Duct Repair & Sealing in Bellaire for these older systems. Metal duct repair requires sheet metal fabrication skills most duct cleaning companies don’t maintain. Our crews cut and form replacement sections on site, secure them with S-drive connectors and screws rather than relying on tape alone, and seal with high-temperature mastic rated for Houston attic conditions. When we repair metal duct in older Houston homes, we also inspect for asbestos-containing duct wrap and follow Texas Department of State Health Services protocols if found.
Duct Insulation
Duct insulation prevents thermal loss as conditioned air travels through unconditioned spaces. In Houston, where attic temperatures regularly exceed 140°F in July, uninsulated or degraded duct insulation can raise supply air temperature by 15-20 degrees before it reaches your register (the visible grille where air enters your room). We see this most often in Pearland and League City homes where original R-4 or R-6 insulation has compressed or torn. CleanRun installs new R-8 fiberglass duct wrap with vapor barrier, secured with proper pins and bands, or replaces flex duct entirely when insulation is integrated into the duct wall. We measure supply air temperature at the plenum and at a distant register to document improvement.
Mastic Sealant Application
Mastic is a thick, water-based sealant brushed or sprayed onto duct joints that cures to a flexible, durable bond superior to tape in Houston’s temperature extremes. Unlike foil tape that can delaminate in high humidity, quality mastic maintains seal integrity through decades of thermal cycling. We apply mastic to all new connections during repair work, and we offer whole-system mastic sealing for older Houston homes where original construction used tape-only methods. A typical mastic sealing job in a 2,500 square foot Houston home addresses 40-80 individual joints across the plenum, trunk lines, and branch takeoffs. Every sealed joint is photographed; the photo record shows brush strokes and coverage, not just “before and after” claims.
Air Leak Repair
Air leaks in duct systems waste 20-30% of conditioned air on average according to Department of Energy estimates, and in Houston’s older housing stock we’ve measured losses exceeding 40% in homes with original ductwork. Leaks occur at disconnected boots (the metal fitting behind your wall register), failed seams in sheet metal fittings, and penetrations where electrical or plumbing lines pass through duct walls. CleanRun locates leaks using smoke pencils, pressure testing, and in some cases thermal imaging to find the source rather than treating symptoms. We repair the leak at its origin, verify reduced loss with repeated testing when equipment allows, and document findings in your written job record with photos of the failed area and completed repair.
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.
Signs You Need Duct Repair & Sealing Right Now
- Uneven temperatures from room to room. If your master bedroom in Katy runs 8 degrees warmer than your living room in August, the problem is rarely the air conditioner itself. We find restricted or collapsed duct runs behind this symptom in roughly 60% of Houston homes we inspect, particularly in subdivisions built during the 2012-2019 construction surge when ductwork was often installed before final framing was complete.
- Dust accumulation immediately after professional cleaning. A properly sealed duct system should stay clean for 3-5 years after thorough air duct cleaning. If you’re seeing dust return within months, your supply ducts are likely pulling attic air through gaps on the return side, pressurizing your home with fiberglass particles and Houston’s pollen load. We’ve traced this pattern to disconnected return plenums in Atascocita and Humble homes.
- Utility bills that spike without rate increases or usage changes. A 30% increase in summer cooling costs often signals duct leakage rather than equipment failure. In Houston’s climate, every cubic foot of cooled air lost to the attic costs more than in milder regions because your system runs longer hours at higher load. We compare your usage patterns to similar Houston homes during our assessment.
- Whistling or rushing air sounds from walls or ceilings. These noises indicate high-velocity air escaping through gaps under pressure, not normal system operation. The sound location often points directly to the leak source, and in multi-story Houston homes we frequently find the noise originates from a second-floor duct run that has separated from its boot behind drywall.
- Musty odors when the system cycles on. Duct leaks in humid climates draw attic air containing mold spores, rodent debris, and degraded insulation directly into your living space. Houston’s 70%+ summer humidity makes this a persistent problem; we’ve found active mold growth on attic-facing duct surfaces in Deer Park and Pasadena homes where leaks went unaddressed for multiple seasons.
BeforeAfterOur Duct Repair & Sealing Process - Step by Step
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System inspection with photo documentation. We start every Houston duct repair with a complete visual inspection of accessible ductwork using a Rotobrush inspection camera. The camera shows debris buildup, corrosion, disconnected joints, and insulation condition inside every run. We photograph findings before recommending any work, and you’ll see these images before we discuss price.
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Written scope and fixed price under Haven Standard Clause 1. Based on inspection findings, we deliver a written scope describing each repair, the materials to be used, and one fixed price for the complete job. No per-vent pricing, no add-ons discovered mid-job, no “call for a quote” evasion. You approve the written price before any panel comes off.
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Targeted repair with trade-specified materials. Our crews carry Honeywell and Aprilaire components for control and damper repairs, Nikro negative-pressure equipment for containment during work, and mastic, tape, and insulation rated for Houston’s temperature and humidity extremes. Metal repairs are fabricated on site; flex replacements use new R-8 duct with proper support spacing.
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Post-repair verification and photo record completion. After repairs, we re-inspect every modified run with the camera and photograph completed work. Where accessible, we verify airflow improvement at registers using a calibrated hood or compare supply temperatures before and after. The photo record includes every repair location, materials used, and verification data.
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Written warranty delivery and 365-Day Done Right Promise activation. Your job concludes with a written invoice, the complete photo record, and documentation of the 365-Day Done Right Promise: if any sealed joint fails, any repaired section separates, or any covered leak recurs within one year, we return and make it right at no charge. This is backed in writing, not a verbal assurance.
How Much Does Duct Repair & Sealing Cost in Houston?
Duct sealing for a typical Houston home with accessible attic ductwork runs $450-$850, depending on the number of joints requiring mastic and whether we can reach all connections without drywall access. Flex duct replacement, our most common repair category, ranges from $280 per run for simple attic replacements to $650 per run when we must navigate tight truss spaces or repair multiple hanger failures. Metal duct fabrication and replacement starts around $550 for localized repairs and can reach $1,800 for extensive plenum reconstruction in older Houston homes with original galvanized systems.
Several factors move these ranges. Attic accessibility determines labor time; Houston’s steep-roofed homes in The Heights or Montrose with limited hatch access take longer than ranch-style homes in Stafford or Missouri City with walk-in attics. The extent of existing damage matters: a single disconnected joint seals quickly, while a system with corroded metal throughout requires section replacement. Insulation replacement adds $180-$400 depending on linear feet. We never quote without inspection because phone estimates in this trade are reliably wrong, and Haven Standard Clause 1 forbids pricing work we haven’t seen.
To avoid overpaying, get any competitor’s estimate in writing and bring it to us. Our Free Second Opinion service puts our fixed price next to theirs, line by line, with no obligation. We also recommend asking any duct repair company whether their price includes photo documentation, what warranty applies, and whether they’ll show you the actual damage before starting work. Call (346) 251-8919 for an exact quote - estimates are free and include the full camera inspection.
Duct Repair & Sealing Near Houston - Our Service Area
CleanRun crews complete duct repair and sealing work throughout Harris, Fort Bend, and Montgomery counties, with daily routes covering Duct Repair & Sealing in Bellaire, Duct Repair & Sealing in Jersey Village, and the full Houston metro including Stafford, Pearland, Humble, Pasadena, Missouri City, Deer Park, Fresno, Atascocita, and Sugar Land. Most scheduled repairs occur within 3-5 business days of estimate approval; we don’t promise same-day dispatch because proper repair requires material staging and crew assignment, not a rushed visit. Emergency sealing for fully disconnected systems causing equipment damage can sometimes be accommodated within 24 hours depending on crew location.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Duct Repair & Sealing in Houston
Duct repair and sealing fixes the physical structure of your duct system - closing leaks, replacing damaged sections, and restoring proper airflow - while duct cleaning removes accumulated debris from intact ducts. A cleaning company can’t seal your leaks, and a handyman with tape can’t properly assess airflow dynamics. CleanRun provides both services with the same inspection and documentation standards.
Most residential duct sealing jobs in Houston take 3-5 hours; flex duct replacement adds 1-2 hours per run depending on attic accessibility. Metal duct fabrication requires more time, typically 4-6 hours for localized repairs. We schedule realistic time blocks and don’t rush crews to multiple jobs per day, because proper sealing requires cure time for mastic and verification of each connection.
Typical Houston duct sealing runs $450-$850, flex duct replacement $280-$650 per run, and metal duct repair $550-$1,800 depending on scope. Every job gets a written fixed price after inspection, with no per-vent add-ons or mid-job surprises. Call (346) 251-8919 for an exact quote - estimates are free and include full camera inspection.
Yes. We’ve serviced hundreds of Honeywell zoning systems and Aprilaire whole-home ventilation setups in Houston homes, and we stock common dampers, controls, and replacement components for both brands. Whether you have Honeywell, Aprilaire, or any other make integrated with your duct system, we can repair and seal the connected ductwork while preserving manufacturer warranty on active components.
We prioritize calls involving complete duct separation that risks equipment damage or water intrusion from condensation, and we sometimes accommodate these within 24 hours depending on crew routing. We don’t advertise generic “emergency service” because most duct issues develop gradually and are properly addressed through scheduled repair with full inspection and material preparation. All calls are answered by a live person who can assess urgency accurately.
Every repair is backed by the 365-Day Done Right Promise: if any sealed joint fails, any repaired section separates, or any covered leak recurs within one year, we return and correct it at no charge. This is a written guarantee included with your job documentation, not a policy subject to manager discretion. Haven Standard Clause 5: Accountable Work requires this documentation on every job.
Clear attic access paths of stored items if possible, and ensure we can reach your electrical panel and thermostat. We’ll handle equipment protection and containment. If you have recent utility bills showing usage spikes, those help us correlate symptoms with findings. We’ll photograph everything we find before recommending work, so no preparation affects what we can show you.
Schedule Your Duct Repair & Sealing Service in Houston Today
Call (346) 251-8919 to schedule your free estimate. A live person will answer, schedule inspection at your convenience, and you’ll receive a written fixed price before any work starts. Every job includes the documented photo record, background-checked uniformed technicians, and the 365-Day Done Right Promise in writing. No coupons, no surprises, no vacuum noise.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Houston, serving Houston since 2013.