Duct Repair & Sealing in Chicago - Leakage Measured, Then Priced in Writing

Fast, Reliable Duct Repair & Sealing Across Chicago

Duct repair and sealing in Chicago typically runs $280-$720 for most residential jobs, with full-system sealing on older homes reaching the higher end when multiple duct runs need attention. We’re CleanRun Duct Repair & Cleaning, and our Chicago office coordinates scheduling and dispatch for homeowners throughout the city and the rural-edge properties west and south of town. Our crews carry Rotobrush and Nikro equipment, background-checked and uniformed, identified by name before they arrive. Call (224) 351-9772 for a written price before any work starts.

Call (224) 351-9772

Chicago’s housing stock isn’t like anywhere else. The roughly 80,000 brick bungalows built between 1910 and 1940 across the Southwest and Northwest Sides were designed for steam or gravity warm-air heat, then retrofitted with forced-air ductwork decades later. That means repairs here often mean sealing improvised runs crammed into knee walls and narrow attic chases that were never engineered for a blower. We know these systems because we’ve documented thousands of them since 2013.

Why CleanRun Air Duct Cleaning Northbrook Is Chicago’s Preferred Duct Repair & Sealing Company

We’ve served over 52,000 homes since 2013, every one with a written price before work started and a documented photo record when the crew left. In Chicago specifically, our reputation rests on what we can show homeowners, not what we claim: the camera image of a separated flex joint in a Bridgeport bungalow knee wall, the static-pressure reading before and after sealing, the mastic application photo time-stamped to the job record.

Our Chicago customers tend to be homeowners who bought between 2015 and 2025 at high price points and research before calling. They choose us because we publish license numbers, name our equipment brands, and deliver every quote in writing under Haven Standard Clause 1. No “call for pricing.” No $79 coupon that balloons once the van arrives.

Dispatch and scheduling are coordinated from our Chicago office. Crews serve the city locally, not routed from distant suburbs. Response to most Chicago neighborhoods runs same-week for non-urgent sealing work, and we prioritize calls from areas with known housing-stock issues - bungalow belt, two-flat conversions, postwar ranch tracts - because we know what to bring.

Every technician operates under Haven Standard Clause 3: Verified Crews. Background-checked, uniformed, identified by name before arrival. The 365-Day Done Right Promise applies in Chicago exactly as everywhere else: if the work isn’t right, we make it right, backed in writing on every job.

Our Duct Repair & Sealing Services in Chicago

Duct Sealing

Most Chicago homes lose 20-30% of conditioned air through leaks at joints, takeoffs, and register boots. In bungalow-belt neighborhoods like Gage Park and Archer Heights, that leakage is worse because retrofit ductwork was cut to fit existing chases, not engineered for tight seals. Our Duct Repair & Sealing team pressurizes the system, measures leakage at the air handler, then seals accessible joints with mastic and mechanical fasteners. We photograph every sealed joint for the job record. Typical duct sealing in Chicago runs $340-$580 for a single-system home.

Flex Duct Repair

Flex duct in Chicago’s two-flats and three-flats - common in Logan Square, Wicker Park, and Pilsen - often sags, kinks, or separates at collars after decades of vibration from furnaces that run hard six months a year. We replace damaged flex runs with properly supported new material, seal with UL-181 tape and mastic, and verify airflow at the register. A single flex run replacement in Chicago typically costs $180-$320.

Metal Duct Repair

Original sheet-metal ductwork in postwar ranch homes on the far Northwest and Southwest Sides - Norwood Park, Garfield Ridge - is now 60-70 years old. Seams separate, rust-through appears at low points, and old gravity-system trunks were sometimes left in place and jury-rigged into newer forced-air systems. We repair or replace metal runs, seal with mastic, and address the insulation gaps that let these trunks sweat during Lake-effect humidity spikes. Metal duct repair in Chicago ranges $280-$620 depending on accessibility.

Duct Insulation

Chicago’s October-to-April furnace schedule means ducts in unconditioned spaces stay hot, then cold, then hot again - thermal cycling that degrades insulation and creates condensation surfaces. In winter, Lake-effect moisture events spike interior humidity, and uninsulated metal trunks sweat inside attic chases. We install or replace duct insulation as part of sealing work, not as an afterthought. Insulation work adds $140-$280 to a typical sealing job.

Mastic Sealant Application

Mastic is the standard for durable duct sealing, but it fails if applied to wet or dirty surfaces. In Chicago, we see premature mastic failure in bungalows where old octopus-furnace plenum remnants sweat during winter humidity spikes, or where crews sealed over debris without source removal first. Our process: camera inspection, source removal, dry surface verification, then mastic application with embedded fabric mesh at stress joints. We document each step.

Air Leak Repair

Return air leaks are especially problematic on rural-edge properties west and south of Chicago, where unpaved road dust and outbuilding particles get pulled straight into the air handler through gaps near the return plenum. We test return-side leakage, seal penetrations with mastic and mechanical fasteners, and verify with post-repair pressure testing. Rural properties with wood heat and outbuilding systems need this checked every 2-3 years, not the 5-year interval typical for filtered city homes.

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Trusted Brands We Service in Chicago

Our equipment roster includes Rotobrush agitation systems, Nikro negative-pressure extractors, Honeywell air-handler components, and Aprilaire filtration and humidity-control products, plus our Dryer Vent Cleaning in Chicago. We stock common repair parts for Chicago’s most frequently encountered systems - 80% furnaces in bungalows, 90%+ condensing units in newer construction, mid-century Bryant and Carrier air handlers in ranch tracts. If your system uses a component we don’t carry, we source it without markup and give you the invoice. Fast turnaround matters in a city where furnaces run six months straight.

Common Duct Repair & Sealing Problems We See in Chicago Homes

• Retrofit ducts buried in knee walls and narrow chases. In bungalow-belt neighborhoods, forced-air ductwork was shoved into spaces never meant for it. Leaks at improvised joints can’t be reached with standard tools, so previous repairs often sealed by guesswork instead of after camera inspection. We use borescope cameras and flexible agitation tools built for tight Chicago chases.
• Uninsulated gravity-system trunks sweating in winter. Old octopus-furnace plenum remnants left in place during retrofits are oversized, uninsulated sheet-metal chambers. During Lake-effect humidity spikes, they sweat inside walls and attics, degrading mastic and creating mold conditions. Sealing without addressing insulation is temporary at best.
• Rural-edge dust loading through leaking returns. Properties on unpaved roads west and south of the city draw fine dust and pollen through return leaks near outbuildings, garages, and crawl spaces. If the return isn’t sealed and the filter cabinet gasketed, that load enters the air handler and distributes through the entire supply system.
• Compressed debris in octopus-furnace remnants. On a bungalow block in Gage Park we pulled a camera inspection into a return chase off the kitchen and found an oversized, uninsulated octopus-furnace plenum trunk still in service, jury-rigged into the newer forced-air system, packed with decades of compacted lint and construction dust from old renovations. Our crew set up negative pressure and HEPA filtration at the air handler, worked source removal back to the takeoff with agitation tools, then sealed the separated trunk joints and knee-wall penetrations with mastic. Post-job static pressure at the registers dropped and the blower motor stopped short-cycling against the leaks.

Pricing for Duct Repair & Sealing in Chicago, IL

We Also Serve Cities Near Chicago

Our crews work throughout the metro area, including Duct Repair & Sealing in Chicago and surrounding communities: Glenview, Des Plaines, Lombard, and Elk Grove Village. Rural properties west and south of the city - with wood heat, outbuilding systems, and unpaved-road dust loading - are within our standard service area and priced on the same written-quote basis.

FAQs - Duct Repair & Sealing in Chicago