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 Evanston
Duct repair and sealing in Evanston typically runs $340-$780 for most residential jobs, with full-system mastic sealing on older homes reaching the higher end. We dispatch crews to Evanston from our Chicago office, and most appointments are scheduled within three to five business days. Call (708) 683-3974 for a written estimate before any work starts.
We’ve worked in Evanston homes since 2013, and the ductwork here isn’t like what we see in Skokie or Glenview. The city’s extraordinary concentration of pre-1940 housing means we’re constantly adapting our approach to gravity-furnace retrofits, non-standard plenum dimensions, and the moisture load that comes from living directly on Lake Michigan. Whether you own a Victorian near Main Street, a four-square off Ridge Avenue, or a rental unit near Northwestern’s campus, your duct system carries specific risks that standard suburban playbooks don’t address.
Why CleanRun Air Duct Cleaning Chicago Is Evanston’s Preferred Duct Repair & Sealing Company
Evanston homeowners have left us documented reviews citing the photo records we deliver, the written prices they received before any panel came off, and technicians who arrived named and uniformed under Haven Standard Clause 3: Verified Crews. We don’t ask for trust; we provide evidence.
Our response time to Evanston is consistent because we coordinate dispatch from our Chicago office and route crews specifically to north-shore jobs without the delays of cross-metro wandering. We know the parking restrictions near downtown Evanston, the equipment access challenges in courtyard buildings near the university, and the permit considerations that apply to work in historic districts.
The 365-Day Done Right Promise applies to every Evanston job in writing, not as a verbal afterthought. If the work isn’t right, we make it right. That’s Haven Standard Clause 5, and it’s printed on every job record we deliver.
Our Duct Repair & Sealing Services in Evanston
Duct Sealing
Most Evanston homes lose 20-30% of conditioned air through leaks at joints, registers, and plenum connections. In older homes with gravity-furnace retrofits, those leaks are often at the crude transitions where oversized trunk lines were tied into mid-century blowers. Our duct sealing service uses mastic sealant and metal-backed tape rated for HVAC temperatures, not the hardware-store tape that peels off in two seasons. We seal what we can access, document what we can’t, and put the scope in writing before starting. A typical duct sealing job in Evanston runs $380-$620 for a single-system home.
Flex Duct Repair
Flex duct is common in Evanston attics and crawl spaces, especially in post-war additions and converted porches. The lake-effect humidity here degrades flex duct liners faster than in drier inland climates, and crushed or sagging runs are routine in tight framing bays near the lakefront. We replace damaged flex with properly sized, insulated runs supported at code-required intervals, not draped over joists. Flex duct repair in Evanston typically costs $180-$340 per run, with written pricing delivered before any demolition.
Metal Duct Repair
This is where Evanston’s housing stock demands real expertise. The original sheet-metal trunk lines in pre-1940 homes were built for gravity convection, not forced-air pressure. We’ve found seams that have worked open over eighty years, rust-through at low points where condensation pools, and amateur patches from decades of incremental fixes. Our Duct Repair & Sealing team fabricates custom metal transitions when stock fittings won’t match non-standard dimensions. Metal duct repair in Evanston ranges from $290 for localized seam welding to $740 for extensive trunk rebuilding with proper transitions.
Duct Insulation and Mastic Sealant
Uninsulated or poorly insulated ducts in Evanston’s humid climate sweat. That moisture degrades surrounding structure and creates the conditions for mold colonization that cleaning alone can’t solve. We install formaldehyde-free duct insulation with vapor-barrier wrapping, sealed at all seams with mastic. For homes with original 1920s sheet-metal ductwork, mastic sealant is often the only practical way to achieve airtightness without dismantling historic fabric. Full duct insulation with mastic sealing runs $520-$780 in Evanston.
Air Leak Repair
Return-air leaks are particularly common in Evanston’s older homes, where panned floor joists or wall cavities serve as return pathways. These leaks pull unconditioned air from basements, attics, and wall interiors, wasting energy and introducing contaminants. We pressure-test the system, locate leaks with smoke pencil and thermal imaging, and repair with code-compliant materials. Air leak repair in Evanston is typically $240-$480, depending on accessibility.
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 Evanston
Our equipment roster includes Rotobrush agitation systems, Nikro negative-pressure extractors, and Honeywell and Aprilaire air quality components. These are trade-recognized brands, not proprietary tools with unverifiable claims. We stock common fittings and sealants for faster turnaround on Evanston jobs, and when a repair calls for a manufacturer-specific part, we source it with documented lead times included in your written estimate. You can look up every brand we name and verify specifications independently. That’s Haven Standard Clause 2: Named Equipment.
Common Duct Repair & Sealing Problems We See in Evanston Homes
- Oversized trunk lines from gravity-furnace conversions. The original “octopus” systems were designed for convection, not blower pressure. Standard residential cleaning rigs can’t navigate the irregular bends, so debris accumulates for decades behind elbows that never see source removal. We disassemble accessible sections and rebuild transitions to proper dimensions.
- Lake-effect humidity sustaining mold growth. Onshore winds push moisture into Evanston ductwork year-round, keeping interior surfaces damp enough for mold colonization even in otherwise well-maintained homes. Sealing leaks without addressing this moisture load just traps the problem inside.
- Asbestos-containing insulation in mid-century retrofits. In the historic corridors near Ridge Avenue and the lakefront, sheet-metal boots, plenums, and duct wrapping from forced-air conversions often contain asbestos. This legally halts any duct work on the spot until a licensed abatement contractor clears the material. We test accessible wrapping before disturbing anything.
- Shared exhaust stacks in multi-family buildings near Northwestern. One tenant’s dryer lint pathway can serve several units, and a partial cleaning of the visible run misses what builds up beyond the reachable trap. We scope the full stack when access allows, and document what we can’t reach.
Pricing for Duct Repair & Sealing in Evanston, IL
We publish ranges because Haven Standard Clause 1 requires written pricing before work starts. Here’s what duct repair and sealing costs in Evanston’s market:
| Service | Typical Range |
|---|---|
| Air leak repair (localized) | $240-$480 |
| Flex duct repair (per run) | $180-$340 |
| Metal duct repair (seam/patch) | $290-$450 |
| Metal duct rebuild (extensive) | $520-$740 |
| Duct sealing with mastic (single system) | $380-$620 |
| Full duct insulation with mastic sealing | $520-$780 |
What moves the price: accessibility (crawl space vs. full basement), extent of damage, whether asbestos-containing materials are present, and whether the system requires pressure testing to locate leaks. Every estimate is free, written, and delivered before any work begins. No per-vent pricing. No coupon bait. Call (708) 683-3974 for your specific number.
We Also Serve Cities Near Evanston
Our crews work throughout the north shore and northwest suburbs, including Evanston, Skokie, Glenview, Northbrook, and Des Plaines. Scheduling and dispatch are coordinated from our Chicago office, with route optimization that keeps appointment windows reliable across the service area.
Serving Evanston, IL - Our Local Coverage Area
We’re based in the Evanston 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 Evanston
We often can’t complete a standard cleaning because the original gravity-furnace trunk lines are oversized and irregularly shaped, with bends that standard residential agitation tools can’t navigate. In this specific neighborhood, we also encounter asbestos-containing insulation on mid-century retrofits about once every five jobs, which legally stops all work until licensed abatement clears it. We inspect accessible wrapping before starting, document what we find with photos, and give you a written scope for repair or sealing instead of pretending a cleaning solved anything. Call (708) 683-3974 and we’ll show you what the camera saw.
Yes. The persistent onshore moisture means duct leaks don’t just waste energy; they actively draw humid air into the system year-round, accelerating corrosion at metal seams and creating conditions where mold colonizes even in well-maintained homes. Inland north-shore suburbs a few miles west don’t experience this same humidity load. Evanston homes benefit from more frequent inspection of seals and transitions, particularly in basements and crawl spaces where lake-effect moisture concentrates. We include humidity readings and seal condition in every written estimate.
It fundamentally changes the scope. A partial cleaning of the visible run from your unit misses lint accumulation beyond the accessible trap, where several units’ exhaust converges. We’ve found completely blocked stacks in campus-area buildings where the tenant turnover meant a decade without service. We scope the full stack when roof or utility access allows, document the blockage with photos, and provide a written report for your building management if common-area maintenance is needed. Individual unit cleaning alone is often insufficient in these buildings.
We pressure-test the system to quantify leakage, then access joints, seams, and register boots to apply mastic sealant and metal-backed tape rated for HVAC temperatures. On 1920s ductwork, we often find that original seams have worked open, or that mid-century blower conversions left crude transitions that will never seal without rebuilding. We document each condition with before photos, rebuild what needs rebuilding, seal what can be sealed, and deliver after photos showing the completed work. The written scope specifies exactly which runs were sealed and which required repair instead.
High turnover means ducts routinely go a decade or more without inspection, and deferred maintenance compounds: small leaks become large leaks, minor rust becomes perforation, and tenant-installed filters of the wrong size allow debris into the system. We frequently find that rental units near Northwestern have had multiple partial repairs by multiple vendors, with incompatible materials layered on top of each other. Our approach is to document the full condition with photos, provide a written scope that addresses the root problems rather than symptoms, and deliver a record the property owner can use for future maintenance planning.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Evanston since 2013.