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 Air Duct Repair Across Boulder
Air duct repair in Boulder typically costs between $350 and $1,400 depending on what’s actually wrong inside the ductwork, and most repairs are completed in a single visit. We’re Linden Air Duct Cleaning, and we’ve spent years working inside the crawlspaces, attics, and return plenums of Boulder’s older homes, where the real problems live. If your system is pulling dust from places it shouldn’t, call (980) 447-2498 and we’ll tell you what’s going on before we ever ask for a dollar.
Boulder’s housing stock is different from what you’ll find in newer Front Range suburbs. The 1950s through 1970s ranch homes that fill Table Mesa, Martin Acres, and the Baseline corridor were built with sheet-metal ductwork that was never intended to last sixty years. When that ductwork fails, it fails in ways specific to this city: subfloor plenums pulling crawlspace air, crushed branch runs behind old remodel walls, and fine foothills grit bonded to duct walls in a way a basic vacuum will never remove. Our Air Duct Repair team knows these failure patterns because we see them every week across Boulder.
Why Linden Air Duct Cleaning Is Boulder’s Preferred Air Duct Repair Company
Boulder homeowners call us because we tell the truth about what’s in their ducts. When we open a 1964 ranch in Martin Acres and find the return plenum was framed with a gap at the subfloor, we show you the photos. That’s the Threshold Standard: every technician who arrives at your door is background-checked, identity-verified, and sent to you by name and photo before the visit. When the tech rings the bell, they show a photo ID badge. No mystery crews, no unmarked vans.
Our repair work has been serving homeowners since 2004 as part of the Threshold Group family. Dispatch and scheduling are coordinated from our Denver office, and our crews serve Boulder locally, so we’re familiar with the specific challenges of working in Table Mesa basements and The Hill rental units. We use professional-grade equipment from Rotobrush and Nikro, and when sealing or air-quality products are needed, we work with Aprilaire and Abatement Technologies materials. Every repair gets a written price before work starts and a written guarantee when it’s done. If a covered repair fails, we return at no charge. That’s not a promotion; it’s how Linden has worked for two decades.
When you call, a live person answers. That’s true at 2 p.m. and 2 a.m. Marcus Veale leads our team, and the standard he set is simple: no voicemail loops, no automated queues. You get a person.
Ductwork Installation in Boulder
Ductwork Installation in Boulder usually involves replacing failed sections of original sheet-metal duct rather than starting from scratch, because much of Boulder’s older housing stock was built well enough to salvage the layout while discarding what’s rotted, crushed, or never sealed correctly. Homeowners in Table Mesa and South Boulder frequently discover during a cleaning that their 1960s trunk lines were never properly joined at the seams, or that a remodel done two owners ago left a branch run disconnected entirely. That’s when new ductwork sections become the honest fix.
What makes installation different in Boulder is the age of what we’re cutting into. The original 1960s-era return-air plenums in this city were routinely framed with open gaps at the subfloor level, a tract-construction shortcut that means many systems have been pulling crawlspace soil air directly into the return side for decades. New ductwork installed without addressing that plenum is a waste of money; the new material will be contaminated from day one.
Return Plenum Sealing and Replacement
In many Boulder homes, the return plenum under the floor is the source of the problem rather than the duct runs themselves. We open it, camera-inspect it, and decide whether it can be sealed with mastic and foil tape or whether it should be replaced. Sealing a plenum correctly means the system holds negative pressure from the air handler, stops pulling radon-laden soil air and crawlspace dust, and the blower motor stops working against leaks it was never designed to fight.
Branch Run Replacement in Finished Basements
Boulder’s 1970s and 1980s remodel boom buried a lot of ductwork behind drywall and framing. When those branch runs were crushed or kinked during construction, nobody saw it until airflow to a back bedroom dropped. We replace those sections, restore full airflow, and confirm the blower amp draw returns to spec before we leave.
HVAC Duct Installation in Boulder
HVAC Duct Installation in Boulder means installing duct material that can handle this city’s specific particulate load: the fine clay and loess dust that Chinook winds strip off the Front Range foothills, plus the recurring wildfire-smoke ash that has become a seasonal reality since the December 2021 Marshall Fire burned through Superior and Louisville and deposited smoke into systems throughout the Boulder Valley. The installation work itself involves sizing new trunk and branch runs to the air handler, sealing every seam and connection, and confirming the system holds negative pressure before it’s buttoned up.
A full residential HVAC duct installation in a Boulder home typically runs $2,800 to $6,500 depending on the home’s square footage, the number of supply and return runs, and whether we’re working in a crawlspace or a finished basement. The price is put in writing before any work begins, and it doesn’t change after the van is in your driveway unless you ask us to add scope.
Sealed System Installation for Smoke and Radon Concerns
Given Boulder’s location at the mountain-plains interface, we install more fully sealed duct systems here than we do in cities with a less punishing wind profile. A sealed system means fewer pathways for post-Marshall-Fire smoke ash, radon-laden soil air, and foothills dust to enter the air you breathe. We use mastic and foil tape at every joint, not just the visible ones.
Air-Handler-to-Duct Transitions
Older Boulder furnaces often sit on sheet-metal plenums that were never properly transitioned to the ductwork. We fabricate and install proper transitions, which improves static pressure and stops the air leaks that make your furnace work harder. It’s one of the least glamorous and most effective repairs we do.
Trusted Brands We Service in Boulder
Our trucks carry parts that match what Boulder homes actually have installed. We service and repair duct systems built with materials from Rotobrush and Nikro equipment is what we run for cleaning and agitation, and when we install filtration or air-quality improvements, we use products from Aprilaire, Abatement Technologies, and Guardsman. We also offer Dryer Vent Cleaning in Boulder. Because we keep a local stock of common sheet-metal gauges, mastic, foil tape, and replacement grilles sized for Boulder’s older homes, we can often turn around a repair in a single visit. When a Table Mesa homeowner needs a 1960s-style return grille replaced, we’re not ordering it from a catalog and coming back next week.
Common Air Duct Repair Problems We See in Boulder Homes
- Unsealed subfloor return plenums in 1960s homes. The original framing left gaps at the subfloor line, so the return side has been pulling crawlspace dust, radon-laden soil air, and post-Marshall-Fire smoke particulates directly into the ductwork for decades. We seal these at the frame line with mastic and foil tape, then verify the system holds negative pressure.
- Crushed or disconnected branch runs from old remodels. Boulder’s 1970s and 1980s renovation wave buried duct sections behind framed walls without anyone checking airflow. A bedroom that’s always cold or dusty often has a kinked branch run hiding behind drywall.
- Fine foothills grit bonded to duct walls. At 5,430 feet in semi-arid air, the exceptionally fine clay and loess dust that Chinook winds strip off the foothills bonds to sheet-metal in a way that standard vacuuming won’t move. It takes agitation tools, HEPA filtration, and source removal to actually get it out.
- Return-air grilles pulling from crawlspaces instead of rooms. In older South Boulder homes, we regularly find the return path was never sealed from the living space, so the system draws from wherever air can enter, including the crawlspace. That’s how a “clean” system reintroduces dust within a month.
Pricing for Air Duct Repair in Boulder, CO
Air duct repair in Boulder typically runs $350 to $1,400 depending on what’s actually wrong. A simple sealing job on a subfloor plenum might land at the low end. Replacing a crushed branch run or fabricating a new return transition runs higher. A full HVAC duct installation for a typical Boulder ranch runs $2,800 to $6,500. Every job gets a written price before work begins, and every repair carries a written guarantee: 365 days, and if a covered repair fails, we come back at no charge. Call (980) 447-2498 for a free estimate. We’ll tell you what it costs before we touch a screwdriver.
We Also Serve Cities Near Boulder
While this page is focused on Air Duct Repair in Boulder, our crews also serve Denver, Greeley, Fort Collins, and Colorado Springs. The same written pricing, the same 365-Day Done Right Promise, and the same verified technician standard apply wherever we work. If you’re just outside Boulder proper, call us and we’ll confirm coverage.
Serving Boulder, CO - Our Local Coverage Area
We’re based in the Boulder 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 About Air Duct Repair in Boulder
Because the original 1960s return-air plenums in those neighborhoods were framed with open gaps at the subfloor level, meaning many systems have been pulling crawlspace air, radon-laden soil gas, and fine loess dust directly into the return side for fifty-plus years. Cleaning alone can’t fix a structural leak. We seal the plenum first, then clean. Call (980) 447-2498 and we’ll camera-inspect your return before recommending anything.
Chinook downslope windstorms routinely exceed 100 mph and strip extremely fine clay and loess dust off the Front Range foothills, pushing it into return-air pathways and bonding it to duct walls. Wildfire smoke, especially since the December 2021 Marshall Fire, deposits smoke ash into HVAC systems throughout the Boulder Valley. At 5,430 feet in semi-arid air, that particulate load accumulates faster and bonds more stubbornly than at lower, more humid elevations. Repair work here has to account for both.
In most cases, repair is the better first move. The original sheet-metal trunk lines in Boulder’s ranch homes are often sound; it’s the plenum seals, branch runs, and transitions that fail. We’ll tell you honestly if the material is too far gone, but we don’t sell full replacements when a targeted repair will restore proper airflow. A written price comes before any work, and the guarantee is written too.
It starts with a camera inspection to identify what’s actually wrong: a plenum gap, a crushed branch run, a disconnected transition, or duct walls loaded with bonded particulate. Then we do negative-pressure containment and source removal, seal the leaks with mastic and foil tape, replace any failed sections, and verify the blower motor amp draw returns to spec. You’ll get before-and-after photos of your own ducts. Call (980) 447-2498 for a free estimate.
Given high tenant turnover and the dense concentration of older rental properties around The Hill, we recommend servicing those systems every three to five years, or sooner if a new tenant reports dust or airflow problems. Many Hill rentals have gone twenty to forty years between cleanings, which means the ductwork has accumulated not just dust but the fallout of decades of deferred maintenance. A one-time deep service with sealing will typically outperform repeated quick cleanings.
If your Boulder home is showing the signs we’ve described here, call (980) 447-2498. A live person answers, we’ll send you the tech’s name and photo before the visit, and the price is in writing before we start. That’s how Linden has done it since 2004, and that’s the standard on every job in Boulder.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving Boulder and the Front Range since 2004.