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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Repair & Sealing Across Denver
Duct repair and sealing in Denver typically runs $340-$890 for a whole-home system, with most jobs scheduled within 3-5 business days and completed in a single visit. CleanRun Air Duct Cleaning Littleton dispatches crews from our Denver office to address joint separation, flex duct sag, and air handler leakage across the metro and surrounding rural properties. Call (720) 315-7291 for a written estimate before any work starts.
We’ve worked on duct systems from 1950s ranch homes in Harvey Park to retrofitted Denver Squares in Capitol Hill, and on rural properties west and east of the metro where unpaved roads and wood heat change everything about how ductwork fails. Our Duct Repair & Sealing team carries mastic sealant, mesh tape, and pressure-pan testing equipment on every truck, because Denver’s climate and housing stock create failure modes you won’t find in a generic manual.
Why CleanRun Air Duct Cleaning Littleton Is Denver’s Preferred Duct Repair & Sealing Company
CleanRun has served 52,000+ homes since 2013, every one with a written price before work began and a Documented Photo Record delivered afterward. In Denver specifically, our crews know the difference between a Park Hill two-story with improvised duct runs squeezed through interior cavities and a Montbello ranch with original sheet-metal trunk lines that have never been touched. That knowledge changes what we bring to the job and how we quote it.
Our technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. The 365-Day Done Right Promise applies to every Denver job in writing, not as a verbal assurance. We also offer a Free Second Opinion on any competitor’s written estimate, no cost, no obligation.
All calls are answered by a live person. You’ll never reach an automated queue when you call (720) 315-7291.
Our Duct Repair & Sealing Services in Denver
Duct Sealing
Denver’s 5,280-foot elevation and single-day temperature swings that can exceed 50°F cause sheet-metal supply and return ducts to expand and contract repeatedly, which progressively loosens joints and pulls attic or crawlspace air into the system. This is more pronounced on rural properties west and east of the metro where unpaved roads add abrasive dust that accelerates joint wear. We seal with mastic sealant and mesh tape, then verify with a pressure pan or duct-blaster test so you have documented proof of the before-and-after leakage rate.
Flex Duct Repair
Technicians working 1970s-built northeast Denver neighborhoods like Montbello routinely find flex duct installed without adequate hangers, sagging into low-point debris and moisture traps. During Colorado’s summer monsoon intrusions, those brief humidity spikes are enough to seed mold colonies in an otherwise bone-dry system. We re-hang flex runs with proper supports, replace crushed or torn sections, and photograph every connection before closing the access panel.
Metal Duct Repair
Denver’s residential core is dominated by 1950s-1970s ranch homes across neighborhoods like Harvey Park, University Hills, and Montbello, many of which have original sheet-metal ductwork that has never been professionally cleaned and shows joint separation from decades of thermal cycling. We repair separated joints, reinforce weak spans, and seal the air handler cabinet to stop unconditioned air infiltration. Every repair is photographed and included in your Documented Photo Record.
Duct Insulation & Mastic Sealant
Denver’s semi-arid climate keeps indoor relative humidity extremely low, which allows fine particulates to stay airborne longer before settling deep into duct systems. Mastic sealant application creates a flexible, durable seal that moves with the metal as temperature swings hit, unlike tape products that dry and crack. For ducts in unconditioned attics or crawlspaces, we assess insulation integrity and recommend repairs where heat loss is measurable.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Denver
Our equipment roster includes Nikro negative-pressure extractors, Honeywell air handler components, and Aprilaire filtration and fresh-air systems. We stock common repair parts for these brands at our Denver office, which means faster turnaround on jobs where a component replacement is part of the seal. For specialized applications, we source from Abatement Technologies. You can verify any of these manufacturers independently before you agree to our written price.
Common Duct Repair & Sealing Problems We See in Denver Homes
- Joint separation from thermal cycling. Denver’s dramatic temperature swings expand and contract sheet-metal ducts daily. On rural properties near unpaved roads, abrasive dust works into loosened seams and accelerates wear beyond what you’d see in a stable climate.
- Wood-heat particulate masking leaks. Wood-burning stoves and fireplaces common on outlying properties produce fine creosote and ash particles that coat duct walls and hide failing joints during a casual look. A camera inspection or negative-pressure test finds what visual inspection misses.
- Sagging flex duct in outbuilding runs. Longer service drives mean detached-garage or outbuilding duct systems are often neglected. Flex duct sags without proper hangers, creating debris traps that can seed mold during brief summer humidity spikes.
- Improvised duct geometry in retrofitted homes. Older Capitol Hill and Park Hill Denver Squares frequently have forced-air systems retrofitted through tight interior cavities. Irregular duct geometries create turbulence points that erode seals and collect debris.
Pricing for Duct Repair & Sealing in Denver, CO
A typical duct sealing job for a Denver single-family home runs $340-$620, depending on system size and access. Flex duct repair with section replacement adds $180-$340 per run. Metal duct repair on original 1950s-1970s trunk lines ranges $420-$890 when multiple joints and cabinet sealing are involved. Duct insulation repair is quoted by linear foot after inspection.
What moves the number: system size, attic or crawlspace access difficulty, whether we need to cut new access panels, and whether pressure-pan or duct-blaster verification is requested. Every quote is a written price delivered before any work starts, per Haven Standard Clause 1. No per-vent pricing. No add-ons after the truck arrives. Bring a competitor’s written estimate and we’ll deliver a Free Second Opinion in writing.
Call (720) 315-7291 for a written estimate. Estimates are free.
We Also Serve Cities Near Denver
Our Duct Repair & Sealing in Denver crews also work in Aurora, Englewood, Littleton, and Westminster. Scheduling and dispatch are coordinated from our Denver office, with route efficiency that keeps arrival windows reliable across the metro.
Serving Denver, CO - Our Local Coverage Area
We’re based in the Denver 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 Denver
Every 18-24 months, not the standard 3-5 year interval. Wood heat produces fine creosote and ash that coat duct walls, and gravel-road dust loads the system with abrasive particulates that accelerate joint wear and mask leaks. We recommend a camera inspection at the 18-month mark to catch separation before it pulls unconditioned air into the supply. Call (720) 315-7291 to schedule.
The combination of 5,280-foot elevation, extremely low humidity, and temperature swings exceeding 50°F in a single day causes sheet-metal to expand and contract far more aggressively than in stable climates. Joints loosen progressively. On rural properties, unpaved roads add abrasive dust that works into those gaps. No other major U.S. city combines all three factors. Call (720) 315-7291 for a pressure-pan test to measure your leakage.
We inspect every accessible joint with a camera, apply mastic sealant and mesh tape to separated connections, seal the air handler cabinet, and verify with a pressure pan that leakage has dropped measurably. On Denver’s older ranch homes, we often find the trunk line has never been opened; we photograph everything before touching a screw and deliver those images as part of your Documented Photo Record. Call (720) 315-7291 for a written quote.
Yes. We regularly repair flex duct runs to detached workshops, garage HVAC systems, and outbuilding heaters on rural Jefferson, Adams, and Arapahoe County properties. These runs are often neglected, sagging without proper hangers, and loaded with debris from longer intervals between service. We re-hang, replace damaged sections, and include outbuilding runs in the same written price. Call (720) 315-7291 to describe your setup.
Yes. Wildfire smoke events drive residents to seal homes and run HVAC continuously for days, which pulls ultra-fine particulates through any leak point. If your ducts have measurable leakage, you’re filtering smoky air through your living space. After significant smoke seasons, we recommend a leakage test and sealing refresh. The 365-Day Done Right Promise covers any seal that fails within a year. Call (720) 315-7291 to schedule.
We were called to a ranch-style home near Kipling and Belleview in unincorporated Jefferson County where the homeowner’s original 1960s sheet-metal trunk line had visible joint separation and was pulling in dust from a gravel driveway. After a camera inspection we used mastic sealant and mesh tape on the accessible joints, re-hung sagging flex runs in the attic, and sealed the air handler cabinet, then verified with a pressure pan that leakage dropped enough to stop the whistle at the registers. The full photo record was delivered that evening.
CleanRun Duct Repair & Cleaning is independently owned and operated under the Haven Standard, established in 2013. Every Denver job starts with a written price and ends with a Documented Photo Record. No exceptions.
Call (720) 315-7291 for your free written estimate.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Littleton, serving Denver since 2013.