Duct Repair & Sealing Cost - Tested First, Written Price Second

Every visit starts with

Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents

Worth knowing

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 & after – our own jobs

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How Much Does Duct Repair & Sealing Cost in Chicago?

Duct repair and sealing in Chicago typically costs between $350 and $1,200 for a standard single-family home, with most jobs landing in the $450-$750 range when the damage is limited to a few runs or joints. Whole-home aeroseal or full duct replacement in older two-flat and three-flat buildings on Chicago’s North and South Sides can push into the $1,500-$3,500 range depending on system size, access, and how far deterioration has spread. Every CleanRun job starts with a written price before any panel comes off – that number is on paper, not delivered verbally after the crew has already opened the plenum.

Duct Repair & Sealing Cost Breakdown (2026)

The table below reflects actual job data from Chicago homes – from Wicker Park greystones with original 1940s ductwork to new construction in Lincoln Square where the builder’s crew left unsealed joints at every trunk-line branch. These are not national averages adjusted by a multiplier. They are what CleanRun quotes in writing on jobs in this market.

What Pushes the Price Up

The single biggest cost driver in Chicago is access. A home in Beverly with original cast-iron radiators converted to forced air in the 1980s often has ductwork routed through wall cavities with no clean-out points. Running a camera and sealant applicator through those runs takes two to three times longer than open basement work in a similar-sized house in Edison Park. More labor hours, same materials – the number goes up.

Chicago’s climate is the other factor most pricing guides ignore. The city’s swing from sub-zero January temperatures to 90-degree July humidity puts constant thermal stress on duct joints. Sheet metal expands and contracts with every season, which is why foil tape – the cheap fix common in the $79-coupon industry – fails here faster than it does in milder markets like Indianapolis or St. Louis. Mastic sealant, which cures flexible and bonds permanently to metal, is the correct material for this climate and it costs more to apply correctly.

Asbestos is a real variable in Chicago. Ductwork in homes built before 1978, particularly in Bridgeport, Canaryville, and the bungalow belt stretching from Portage Park through Dunning, can have asbestos-containing insulation wrapped around the plenum or main trunk line. If camera inspection reveals this condition, the scope shifts to include safe handling procedures under Illinois EPA guidelines – and that changes the job cost meaningfully. CleanRun will identify this during inspection and provide the written scope adjustment before any work proceeds.

What Keeps the Price Down

Catching leaks early keeps costs down. A single failed joint seal at a trunk-line branch – the kind our camera finds in the first ten minutes of an inspection – costs $80 to $150 to fix correctly. Left for two or three heating seasons, the gap widens, surrounding metal fatigues, and what was a joint repair becomes a section replacement. The numbers above reflect that progression clearly.

Bundling duct repair with an Duct Repair & Sealing in Chicago full-system inspection also reduces per-item cost because the setup work – positioning equipment, accessing the plenum, running the camera – is shared across the full scope rather than charged per repair. This is how CleanRun prices multi-item jobs, and the written quote will show every line item so you can see exactly where that efficiency lands.

What Affects Duct Repair & Sealing Pricing in Chicago

• System age and material type: Homes built before 1960 on Chicago’s North Shore corridor or in South Side bungalow neighborhoods often have galvanized sheet metal that has developed pinhole corrosion along seams. That metal cannot simply be resealed – sections need to be cut out and replaced. Flex duct installed in the 1990s has a different failure mode: the inner liner separates from the helix wire frame, collapsing airflow. Camera inspection tells us which condition we’re dealing with before we quote repair versus replacement.
• Duct location and physical access: Basement ductwork in an unfinished utility space is straightforward to access. The same duct run in a finished basement in Lincoln Park – behind drywall, above a drop ceiling – requires either access panel work or aeroseal injection, both of which add to the scope. Attic runs in ranch homes in Norwood Park or Jefferson Park are another common access challenge, particularly in summer when attic temperatures can slow cure times on mastic sealant.
• Number of leaks and their severity: A system with two failing joints near the furnace is a different job from a system where every branch elbow has separated slightly – a condition we see regularly in homes where the original installation used screws alone with no sealant. Severity is documented with camera footage before pricing is finalized.
• Square footage and number of duct runs: A 1,400-square-foot condo in Lakeview has eight to twelve supply runs. A 3,200-square-foot single-family in Beverly or Morgan Park has twenty or more. The written price scales accordingly because every run gets photographed and every accessible joint gets addressed.
• Sealing method – mastic versus aeroseal: Mastic is the workhorse material for accessible ductwork and performs well in Chicago’s freeze-thaw climate. Aeroseal – a pressurized polymer that seals from inside the duct without physical access – carries higher material and equipment costs but is the right call when access is genuinely limited. CleanRun will recommend the method that solves the documented problem, not the one that looks more impressive on an invoice.
• City permit requirements: Duct repairs that modify more than 50% of a system in Chicago may fall under IECC 2021 code requirements for duct leakage testing adopted by the City of Chicago Building Department. This is particularly relevant on gut rehabs in neighborhoods like Pilsen, Logan Square, and Avondale where permitting is actively enforced. Where a permit is required, CleanRun will identify that in the written scope – it affects timeline and cost, and you’ll know about it before work starts.

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How to Save on Duct Repair & Sealing

Get a Written Second Opinion Before Agreeing to Any Scope

Chicago has no shortage of companies that quote duct repair by walking through a house with a flashlight and describing what they found verbally. A written scope with line-item pricing is not standard practice in this industry – it is the exception. If you’ve received a quote that isn’t in writing, request it in writing before signing anything. If the company won’t produce one, that tells you something important about what happens when the job doesn’t go as described.

CleanRun offers a free second opinion on any written estimate. Bring the competitor’s quote – we put our own number next to it, in writing, at no cost. Call (708) 683-3974 to schedule that conversation. There is no charge, no pressure, and the written comparison is yours to keep regardless of what you decide.

Don’t Confuse Cheap Materials with Savings

Foil tape – the silver tape sold at hardware stores – costs almost nothing to apply and lasts two to five years in Chicago’s climate before the adhesive fails from thermal cycling. Mastic sealant, applied correctly by someone who has photographed the joint before and after application, costs more upfront and lasts fifteen to twenty years. The math on foil tape doesn’t work in Chicago. It looks like savings on the invoice and becomes a callback in three heating seasons.

This is not a sales argument for more expensive materials. It is a documented pattern from jobs in this market. When our camera revisits a duct system that was “repaired” by a previous company, the most common finding is dried, cracking foil tape at every joint that was touched. We photograph it before we touch anything, and the before photo is part of the record we hand back to you at the end of the job.

Bundle Inspection with Repair When Possible

A standalone camera inspection of a duct system in a Chicago home runs $150 to $250 as a separate service call. When that inspection is performed as part of a repair job, the setup cost is shared. If you have any reason to suspect duct problems – rooms that don’t heat evenly, utility bills that jumped without explanation, or a home that’s more than twenty years old and has never had duct work inspected – schedule the inspection at the same time as any repair scope discussion. You get the documented record, the camera footage, and the written repair quote in a single visit.

Act on Small Leaks Before They Become Large Ones

A $120 flexible duct section repair becomes a $2,000 plenum replacement when the underlying pressure imbalance that caused the original failure goes unaddressed for a few years. We see this progression in Chicago homes regularly, particularly in two-story colonials in Sauganash and Edison Park where the second floor runs off a single trunk line. The trunk loses a branch joint, pressure rises in the system, the plenum takes stress it wasn’t designed for, and the next owner is looking at a full replacement. Early repairs, documented properly, prevent that trajectory.

Verify What Equipment Is Being Used Before Agreeing to a Price

Professional duct sealing and inspection requires professional equipment. CleanRun uses Rotobrush camera systems for duct inspection, Nikro and Abatement Technologies equipment for negative-pressure work, and Honeywell and Aprilaire components where filtration is part of the scope. These are trade-recognized brands with published specifications – you can look them up before a truck arrives. If a company can’t tell you what brand of camera or sealant system they’re using, the written quote is the right place to ask that question.

FAQs – Duct Repair & Sealing Cost

How much does duct sealing cost in Chicago?

Duct sealing in Chicago costs $250 to $850 for a partial to whole-home mastic application on a standard single-family home, and $1,200 to $2,500 for aeroseal injection when physical access to the ductwork is limited. The difference between those two price ranges comes down to access and method, not the size of the house alone. A 2,500-square-foot home in Ravenswood with an open unfinished basement lands at the lower end. A similar-sized home in Lincoln Park with a fully finished lower level and ducts routed through wall cavities is an aeroseal candidate. CleanRun provides the written number before any work starts – call (708) 683-3974 for a free estimate at your address.

Is it cheaper to repair or replace ductwork in Chicago?

Repair is cheaper than replacement in most cases – a full system replacement on a Chicago single-family home runs $2,000 to $5,500 or more, while targeted repairs on a system in reasonable structural condition typically cost $350 to $1,200. The tipping point is usually when more than 35 to 40 percent of the system is compromised, either by corrosion, physical damage, or material failure. Camera inspection documents exactly what percentage of the system needs attention – that record is what makes the repair-versus-replace decision an evidence-based one rather than a guess. We’ll show you the footage and give you both numbers in writing so you can compare them.

How long does duct repair last in Chicago’s climate?

Mastic sealant applied correctly to clean, dry metal lasts 15 to 20 years in Chicago’s climate without reapplication. Aeroseal carries a manufacturer warranty and performs similarly over time when the underlying structural condition of the ductwork is sound. Foil tape – the cheap alternative – typically lasts 3 to 7 years in this market before thermal cycling degrades the adhesive. Chicago’s freeze-thaw range, which can swing 100 degrees between January lows and July highs, puts more stress on duct joint adhesives than most national “average lifespan” figures account for. The before-and-after photo record CleanRun provides on every job creates a dated baseline – so if you call us back in five years, we know exactly what was done and what the system looked like when we left.

Does Chicago require a permit for duct repair?

Minor repairs to existing ductwork – sealing joints, replacing a single flex duct run, patching a section – generally do not require a permit in Chicago. Larger scopes that modify more than 50 percent of the duct system, or any duct work done as part of a permitted renovation or HVAC replacement, may trigger review under the City of Chicago’s adopted IECC 2021 mechanical code, which includes duct leakage testing requirements. This is most commonly relevant on gut rehabs in Pilsen, Logan Square, Avondale, and other neighborhoods with active Code Enforcement presence. CleanRun identifies permit requirements during the inspection phase and includes that information in the written scope – you won’t find out mid-job that something requires a permit. Call (708) 683-3974 if you’re unsure what applies to your specific project.

Can I seal my own ducts with tape from the hardware store?

You can seal visible, accessible joints with foil tape yourself, and in a pinch it will reduce leakage in the short term. The honest answer is that foil tape fails faster in Chicago’s climate than the product packaging implies – most joints we re-inspect after a DIY tape repair show adhesive failure within three to five heating seasons. Mastic sealant is the professional standard for a reason: it bonds chemically to metal rather than relying on pressure-sensitive adhesive, and it bridges small gaps that tape cannot conform to. It also requires the surface to be clean and dry, which means the duct interior needs to be inspected and cleaned before sealing – a step that isn’t obvious until you see what a camera finds at the first elbow. The repair itself is not dangerous for a homeowner to attempt on accessible ductwork, but the materials and the inspection step make a material difference in how long the repair holds.

CleanRun’s Approach: A Written Price, a Camera Record, a 365-Day Guarantee

Every duct repair and sealing job CleanRun takes on in Chicago follows the same documented sequence. Before any work starts, you receive a written price – line by line, no verbal estimates, no numbers that change after the crew opens a panel. That’s Haven Standard Clause 1, and it applies to every job regardless of scope or neighborhood.

During the job, a camera documents the interior of every duct run before and after work is performed. The before-and-after photo record is delivered to you as a standard part of the job – not a paid upgrade, not something we keep on file for our own reference. It’s yours. It’s dated. It shows exactly what was found and exactly what the system looks like when we leave.

After the job, the 365-Day Done Right Promise covers the work in writing. If something isn’t right, CleanRun makes it right – that’s a written commitment, not a policy subject to manager approval or a call center review process.

Our technicians operate under Haven Standard Clause 3: Verified Crews. Every technician is background-checked, uniformed, and identified by name before they arrive at your address. The equipment on the truck – Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, Guardsman – is professional grade and named specifically so you can verify it independently before agreeing to anything.

CleanRun has been documenting duct work in Chicago homes since 2013, across more than 52,000 jobs in neighborhoods from Rogers Park to Beverly, Wicker Park to Hegewisch. That’s a large number of before-and-after photos. It’s also a large number of written prices that held exactly as quoted – no surprises when the invoice arrived.

If you want to understand what’s happening inside your duct system – what the camera actually shows, what the repair scope actually covers, and what the number actually is before anyone picks up a tool – the process starts with a call. Live person, every time, around the clock.

For a free written estimate on our Duct Repair & Sealing services at your Chicago address, call (708) 683-3974. You’ll have a number on paper before any work begins. That’s the only way we operate.

You can also learn more about what the full service covers on our home page, or read the full scope of what’s included in a documented repair visit on our Duct Repair & Sealing in Chicago service page.

• Key Takeaway 1: Most Chicago duct repair and sealing jobs cost $350 to $1,200. Aeroseal whole-home sealing runs $1,200 to $2,500. Full replacement is $2,000 to $5,500+.
• Key Takeaway 2: Chicago’s climate – hard winters, humid summers, wide thermal swings – makes mastic sealant the correct material choice over foil tape for any repair meant to last more than a few years.
• Key Takeaway 3: Duct access is the biggest cost variable in Chicago. Finished basements, wall-cavity routing, and attic runs all add scope compared to open basement systems.
• Key Takeaway 4: Camera inspection before pricing is not optional at CleanRun – it’s the basis for every written quote. What the camera finds determines what gets quoted, not a general estimate based on square footage alone.
• Key Takeaway 5: The 365-Day Done Right Promise means the work is accountable after the truck leaves. That’s in writing on every job – not a marketing phrase.

Pricing reflects the Chicago market as of 2026. CleanRun Air Duct Cleaning Chicago offers free estimates – call (708) 683-3974.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Chicago, serving Chicago, IL since 2013.