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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AfterFast, Reliable Duct Repair & Sealing Across Thornton
Duct repair and sealing in Thornton typically runs $340-$890 for most residential jobs, with flex duct replacement at the higher end and targeted air-leak sealing at the lower. We dispatch crews to Thornton from our Denver office, and most Thornton appointments are scheduled within 3-5 business days. Call (720) 513-5159 for a written estimate before any work starts.
We’ve worked Thornton homes since 2013, from the original ranches south of 104th Ave to the new production builds north of 136th. Our Duct Repair & Sealing team knows the difference matters. The 1970s flex duct in a Thornton ranch fails differently than the metal trunk lines in a 2019 build, and the dust loading in a rural property east of Colorado Blvd bears no resemblance to either. We photograph every run before we touch it, quote a flat price in writing, and leave you with a documented record of what was found and what was fixed.
Why CleanRun Air Duct Cleaning Aurora Is Thornton’s Preferred Duct Repair & Sealing Company
CleanRun is independently owned and operated under the Haven Standard, not a franchise network, and we’ve delivered written prices on every one of the 52,000+ jobs we’ve completed since 2013. Thornton homeowners find us because they searched for proof, not promises. Our reviews mention the photo record by name: customers who expected a vacuum-and-go instead received dated images of their own duct interiors, with debris measured and joints labeled.
Our crews serve Thornton locally, dispatched from the Denver office with equipment trailers stocked for Adams County jobs. We carry mastic, flex duct, metal fittings, and insulation rated for Colorado’s altitude and dry climate. Technicians are background-checked and uniformed under Haven Standard Clause 3: Verified Crews, and we identify each crew member by name before arrival.
The 365-Day Done Right Promise applies in Thornton exactly as it does everywhere we work: if the repair fails, the seal leaks, or the airflow doesn’t match what we documented, we return and make it right. It’s in writing on every job, not a verbal assurance.
Our Duct Repair & Sealing Services in Thornton
Duct Sealing
Leaky ducts in Thornton pull in exactly what surrounds them. In southern ranches, that’s alkaline prairie soil from crawlspaces through torn flex collars. In northern builds, it’s the fine orange-tan clay that blew through returns during construction. Our sealing protocol starts with a pressure test to quantify leakage, then targets each joint with mastic sealant or mechanical reinforcement depending on the duct material. We use Abatement Technologies negative-pressure containment during the work so nothing migrates to living spaces. A typical duct sealing job in Thornton runs $340-$580 for a single system.
Flex Duct Repair
Thornton’s 1970s-1980s ranches along 88th and 104th Ave corridors are filled with original flex duct that has hardened, torn at the collar, or collapsed entirely. The material degrades faster in Colorado’s dry climate; the plasticizers evaporate, the wire helix rusts, and the insulation sags. We replace crushed or separated runs with new flex duct sized to the original Manual D specification, secure collars with mechanical fasteners plus mastic, and photograph every connection. Flex duct repair in Thornton typically costs $180-$420 per run, with trunk line replacement higher.
Metal Duct Repair
Production homes north of 120th Ave often use galvanized trunk lines with flex branches. The metal holds up better than flex, but seams separate under vibration and thermal cycling at 5,400 feet elevation. We re-seal metal seams with mastic and fiberglass mesh, repair or replace damaged take-offs, and reinforce supports where long spans have sagged. Metal repair in Thornton runs $260-$640 depending on accessibility and the extent of re-sealing required.
Air Leak Repair
Air leaks are the silent efficiency killer in Thornton homes. The homeowner sees high utility bills and assumes the furnace is failing; the real problem is conditioned air escaping into the attic or crawlspace through gaps at the plenum, register boots, or disconnected collars. We pressurize the system, locate leaks with smoke pencil and thermal imaging, then seal each one and re-test. Air leak repair in Thornton typically falls in the $280-$520 range for a complete system diagnosis and seal.
Duct Insulation
Thornton’s temperature swings, especially in rural properties with longer duct runs to outbuildings, punish under-insulated ducts. We replace degraded insulation with closed-cell products rated for Colorado’s UV and dry conditions, paying special attention to exposed runs in attics and crawlspaces where Thornton’s intense sun and wind accelerate deterioration.
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.
BeforeAfterTrusted Brands We Service in Thornton
Our equipment roster includes Rotobrush agitation systems, Nikro HEPA extractors, and Guardsman containment products, plus Honeywell and Aprilaire air quality components. We stock common flex duct diameters, collar sizes, and mastic compounds for Thornton jobs so we’re not waiting on Denver supply houses. For repair work, we source metal fittings and insulation from trade suppliers with Adams County delivery routes. You can verify every brand independently; we name them because the equipment matters as much as the technician operating it.
Common Duct Repair & Sealing Problems We See in Thornton Homes
- Flex duct deterioration in southern Thornton ranches. Original 1970s-1980s flex has hardened and torn at the collar, creating major leaks that pull alkaline prairie soil from crawlspaces and attics directly into the airflow. Homeowners notice dust streaking from registers and assume it’s a filter problem.
- Construction-phase contamination in northern production homes. Ducts in 5-10 year old homes north of 120th Ave are packed with fine orange-tan Adams County clay because the houses were sealed up while surrounded by bare graded earth. The blower motor and evaporator coil cake with debris, causing premature failure.
- Disconnected metal trunks in rural outbuildings. Properties east of Thornton with unpaved road access often have neglected outbuilding systems where metal trunk lines have separated at seams or rodent damage has destroyed insulation. These require extensive re-sealing before any cleaning can be effective.
- High static pressure from combined restrictions. When construction dust coats the blower wheel and debris narrows the duct interior, the air handler works harder against elevated resistance. We measure static pressure before and after repair to document the improvement.
Pricing for Duct Repair & Sealing in Thornton, CO
Here’s what duct repair and sealing costs in Thornton, based on jobs we’ve completed in Adams County over the past two years:
| Service | Typical Range |
|---|---|
| Targeted air leak sealing (single system) | $280-$520 |
| Duct sealing with pressure test (full system) | $340-$580 |
| Flex duct repair / replacement (per run) | $180-$420 |
| Metal duct repair with seam re-sealing | $260-$640 |
| Duct insulation replacement (per run) | $220-$480 |
| Complete system assessment with written scope | No charge |
Every price is written before work begins, under Haven Standard Clause 1. No per-vent pricing. No coupon that triples once we’re on site. If you have a competitor’s written estimate, we provide a Free Second Opinion at no cost. Call (720) 513-5159 to schedule.
We were called to a 2016-built home near 144th Ave and Holly St where the homeowner complained of dust streaking from every supply register; our camera inspection showed flex runs coated in orange-tan clay and several joints separated at the collar, so we performed source removal with HEPA filtration and negative pressure, then re-sealed the flex connections with mastic and replaced crushed sections. After agitation tools cleared the trunk line and we balanced the air handler, the static pressure dropped and the homeowner stopped seeing dust shadows on the ceilings.
We Also Serve Cities Near Thornton
Our crews work throughout the northern metro, including Duct Repair & Sealing in Thornton and surrounding communities: Commerce City to the south, Aurora to the southeast, Brighton to the northeast, and Denver proper. Rural properties east of Thornton with outbuilding systems or longer driveways are scheduled with equipment trailers stocked for extended jobs.
Serving Thornton, CO - Our Local Coverage Area
We’re based in the Thornton 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 Thornton
Yes, and it’s common in Thornton’s northern developments. Homes built between 2010 and 2020 were often sealed up while surrounded by bare graded earth, and the prevailing west-to-east winds off the Front Range pumped Adams County clay directly into return-air grilles before the landscaping was finished. The duct system isn’t dirty from living in the home; it’s dirty from construction-phase contamination that was never removed. We document this with camera inspection and provide a written scope before any work starts. Call (720) 513-5159 for an assessment.
Rural properties on unpaved roads typically need duct inspection every 2-3 years, not the 5-7 year interval standard for fully urban homes. Wood heat produces fine ash particulate that accumulates in duct interiors, and unpaved road dust loads the system faster than pavement-filtered environments. Combine those factors with longer duct runs to outbuildings, and you have a system that degrades faster and is inspected less often. We recommend a documented photo record every 2-3 years to catch separation and insulation damage before it becomes a major repair. Call (720) 513-5159 to set a schedule.
Duct sealing reduces the total system leakage, which lowers the static pressure the air handler must overcome and restores designed airflow to each room. In Thornton, high static pressure often results from the combination of construction dust narrowing duct interiors and leaks forcing the blower to pull from unconditioned spaces instead of the return grille. We measure static pressure before sealing, target every verified leak with mastic, then re-test to document the drop. Typical improvements run 0.2-0.5 inches water column on residential systems. Call (720) 513-5159 for a pressure test.
Yes. We schedule rural properties with equipment trailers stocked for extended jobs, and we photograph outbuilding systems with the same documentation protocol as the main house. Common findings include disconnected metal trunks, rodent-damaged insulation, and seams separated from thermal cycling in unconditioned spaces. These require repair and re-sealing before any cleaning can be effective. The written price covers the full scope, including travel time. Call (720) 513-5159 to describe your setup.
We use Rotobrush mechanical agitation systems, Nikro HEPA negative-pressure extractors, and Guardsman containment products for source removal; Honeywell and Aprilaire components for air quality integration; and Abatement Technologies containment for occupied-space protection during repair work. Every brand is named on your written scope so you can verify specifications independently. Call (720) 513-5159 with questions about any specific equipment.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Thornton since 2013.