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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AfterTrusted Duct Repair & Sealing for Northbrook Homeowners
Duct repair and sealing in Northbrook typically costs $340-$890 for most residential jobs, with full-system sealing running higher depending on home size and accessibility. CleanRun Air Duct Cleaning Northbrook has completed this work in Northbrook since 2013, and every job starts with a written price delivered before any panel comes off. Call (224) 351-9772 for a free estimate with no obligation to book.
Northbrook’s housing stock tells a specific story. The split-levels and ranches built between 1955 and 1978 in neighborhoods like Techny and Shermerville Manor often have galvanized steel ductwork that’s reached the end of its functional life. The newer construction in East Northbrook and the homes near the Glen typically use flex duct runs that sag, get crushed, or separate at the plenum connection. We’ve photographed both conditions hundreds of times, and the pattern is consistent: ducts that leak 20-30% of conditioned air into attics and crawlspaces before it ever reaches a register (the vent where air enters your room). This is why Duct Repair & Sealing - Northbrook homeowners call us when energy bills spike.
Our crews operate under the H.A.V.E.N. Standard, with background-checked, uniformed technicians who arrive identified by name. Every duct repair and sealing job in Northbrook concludes with a Documented Photo Record of every duct run, included as standard. The 365-Day Done Right Promise applies in writing, not as a verbal assurance.
What Our Duct Repair & Sealing Service Includes
Duct Sealing
Duct sealing closes the gaps, seams, and connection points where conditioned air escapes your supply ducts or unconditioned air enters your return path. In Northbrook, we most often find leaks at the plenum (the large central box that distributes air to each duct run), where temperature swings in unconditioned attics cause metal expansion and separation over decades. CleanRun Air Duct Cleaning Northbrook seals these connections with mastic sealant and reinforced mesh, then verifies the result with a pressure test. We document the before-and-after leakage rate in your job record so you can see the measurable difference.
Flex Duct Repair
Flex duct, the insulated flexible tubing common in Northbrook homes built after 1985, degrades when attic heat cooks the outer liner or when pests compress the inner core. We’ve replaced flex duct runs in our Duct Repair & Sealing in Glenview and Northbrook where the original installation left the duct draped across rafters, creating low points that trap moisture and collapse airflow. Our crews install new flex duct with proper support straps, maintaining the manufacturer’s specified bend radius so air moves freely. Every replacement gets photographed before insulation goes back.
Metal Duct Repair
Galvanized steel ductwork in older Northbrook homes corrodes from the inside out, particularly on return lines where condensation collects. The camera often shows pinholes and separated seams that leak air into wall cavities for years before anyone notices. CleanRun repairs accessible metal duct with custom-fitted patches and sealed welds, or replaces sections when corrosion has compromised structural integrity. We match existing gauge and diameter so the repair integrates with your system without creating turbulence or noise.
Duct Insulation
Uninsulated or degraded duct insulation in Northbrook attics wastes energy every summer when 140-degree air surrounds a 55-degree supply line. The result is condensation, mold risk, and cooled air that arrives at your register lukewarm. We install new fiberglass or foil-faced insulation at R-6 or R-8 value, depending on your duct location and the Illinois energy code requirements for your municipality. The work is photographed at each stage, and we note any insulation that had to be removed due to mold or pest contamination.
Mastic Sealant
Mastic is a water-based, fiber-reinforced compound that remains flexible after curing, making it the preferred sealant for duct joints that experience vibration and thermal movement. Unlike foil tape, which peels and fails within 3-5 years in attic conditions, mastic properly applied lasts the life of the duct system. CleanRun technicians brush mastic 2 inches beyond each joint, then embed fiberglass mesh for reinforcement on gaps larger than 1/8 inch. We specify the product by manufacturer, typically Guardsman or Abatement Technologies compounds rated for HVAC application.
Air Leak Repair
Air leaks in ductwork often masquerade as HVAC equipment problems. We’ve arrived at Northbrook homes where the homeowner had already received a quote for a new furnace, when the actual issue was a disconnected return duct in the basement pulling unconditioned air past the thermostat. Our diagnostic process uses pressure testing and smoke pencils to locate leaks that visual inspection misses. The repair is targeted, documented, and typically costs a fraction of equipment replacement.
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.
Brands We Service for Duct Repair & Sealing
CleanRun technicians work with duct systems connected to all major HVAC brands. We’ve serviced hundreds of Honeywell air handlers and zoning panels in Northbrook and surrounding suburbs, and we stock common Honeywell dampers and actuator hardware for repairs that don’t require a return visit. Aprilaire humidifiers and air cleaners integrate directly into ductwork, and we’ve repaired or resealed countless plenum connections where Aprilaire media cabinets were added as aftermarket upgrades without proper support.
We also regularly encounter Abatement Technologies HEPA filtration systems and Guardsman-treated flex duct in homes with indoor air quality concerns. Whether you have Honeywell, Aprilaire, or any other make, we can repair and seal the ductwork that connects to it. Our equipment roster includes Rotobrush, Nikro, and Abatement Technologies tools, and we name the specific brands we use so you can verify their specifications independently.
BeforeAfterSigns You Need Duct Repair & Sealing Right Now
- Uneven temperatures from room to room. If your second floor in Northbrook runs 8-12 degrees warmer than the first in summer, the duct system is likely leaking or undersupplying the upper level. We measure airflow at each register with a calibrated hood and compare it to the design load for that room.
- Dust that returns within days of cleaning. Leaky return ducts pull attic air loaded with fiberglass particles and settled dirt directly into your system. The filter catches some, but the volume overwhelms it. We’ve photographed return plenums in Techny homes with gaps large enough to fit a hand.
- Utility bills that spike without rate changes. A 20% duct leakage rate can increase heating and cooling costs by 30% or more, according to Department of Energy estimates. Northbrook’s ComEd and Nicor rates make that math expensive fast, particularly for all-electric homes near Sanders Court.
- Whistling or rushing noise from registers. That sound is air moving through a gap it’s not supposed to, or a duct that’s become disconnected and is pressurizing a wall cavity. Both conditions waste energy and can drive moisture into structural spaces.
- Musty or chemical odors when the system runs. Leaky return ducts in crawlspaces or garages pull in volatile organic compounds, radon, or mold spores. In Northbrook’s older split-levels with garage-adjacent mechanical rooms, this is a documented health concern, not just a comfort issue.
Our Duct Repair & Sealing Process - Step by Step
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Written estimate delivered on site. We inspect your accessible ductwork, identify problem areas, and provide a written price before any work begins. Haven Standard Clause 1: No Exceptions. This is not a “range” or “starting at” figure. It’s the price you’ll pay.
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Diagnostic pressure testing. We seal your registers temporarily and pressurize the duct system to measure total leakage against the conditioned floor area. Northbrook homes built before 1980 often test at 25-35% leakage; the target is under 10% for sealed systems. We record this number in your job file.
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Photographic documentation of every run. Before a tool touches your ducts, we photograph the condition of each accessible run from the plenum to the register. This becomes your baseline. Customers in East Northbrook have used these photos in real estate disclosures to document system condition.
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Targeted repair and sealing. We repair or replace damaged sections, seal all joints with mastic and mesh, and insulate where needed. Metal repairs are patched or replaced. Flex duct is supported at proper intervals. We work section by section, photographing each completed stage.
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Post-repair verification and delivery. We retest pressure leakage, deliver your Documented Photo Record showing every before-and-after, and provide the 365-Day Done Right Promise in writing. If the work is not right, we make it right. The truck doesn’t leave until you have both documents in hand.
How Much Does Duct Repair & Sealing Cost in Northbrook?
Duct sealing for a typical Northbrook home with 8-12 runs runs $340-$620 when the ductwork is accessible and primarily needs sealing at joints and the plenum. Flex duct replacement for 2-3 damaged runs adds $180-$340 per run depending on length and attic accessibility. Full metal duct repair or replacement in older homes starts around $890 and scales with the linear feet involved and whether we need to coordinate drywall repair for concealed runs.
Several factors move the price. Attic access through a small hatch in a closet adds labor time versus a full-size pull-down stair. Ductwork buried under blown-in insulation requires careful removal and replacement. Homes in Shermerville Manor with original 1950s galvanized steel often need more extensive repair than 1990s construction in Duct Repair & Sealing in Deerfield and the Glen area. And if we find asbestos-containing duct tape or insulation, abatement coordination adds cost and timeline.
What the price includes: all labor, materials (mastic, mesh, insulation, replacement flex duct or metal as specified), pressure testing before and after, the Documented Photo Record, and the 365-Day Done Right Promise. What it does not include: HVAC equipment repair, asbestos abatement, or drywall repair after concealed access. Those are quoted separately if needed.
How to avoid overpaying: get a written scope, not a verbal promise. Ask for the leakage test result in writing. Request photos of your actual ducts, not stock images. CleanRun provides all three as standard. We also offer a Free Second Opinion on any written estimate from another company, no cost, no obligation. Bring their quote; we put our number next to it in writing.
| Service | Typical Range in Northbrook | What Affects Price |
|---|---|---|
| Duct sealing (8-12 runs) | $340-$620 | Accessibility, current leakage rate |
| Flex duct replacement (per run) | $180-$340 | Length, attic conditions |
| Metal duct repair (partial) | $450-$780 | Corrosion extent, location |
| Full system sealing + insulation | $890-$1,450 | Home size, duct material, access |
Duct Repair & Sealing Near Northbrook - Our Service Area
CleanRun Air Duct Cleaning Northbrook dispatches crews daily to Duct Repair & Sealing in Northbrook, Duct Repair & Sealing in Deerfield, and Duct Repair & Sealing in Glenview, with typical drive times under 20 minutes during non-peak hours. We also regularly service Highland Park, Mount Prospect, Des Plaines, Arlington Heights, Palatine, Elk Grove Village, Schaumburg, Hoffman Estates, and Glendale Heights. Most Northbrook appointments are scheduled within 3-5 business days, with written confirmation sent by text and email including your technician’s name and photo.
Serving Northbrook, IL - Our Local Coverage Area
We’re based in the Northbrook area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Duct Repair & Sealing in Northbrook
Duct repair and sealing fixes the physical pathways that move heated and cooled air through your home, closing leaks and replacing damaged sections so conditioned air reaches your rooms instead of your attic or crawlspace. The work includes sealing joints with mastic, repairing or replacing flex duct and metal duct, adding insulation, and verifying results with pressure testing. CleanRun documents every stage with before-and-after photos of your actual duct runs.
Most residential duct sealing jobs in Northbrook take 3-5 hours for a single crew, with flex duct replacement adding 1-2 hours per run depending on attic access. Full-system repairs in larger homes or those with original 1950s-1970s metal ductwork may extend to a full day. We provide a time estimate in writing with your price quote, and we don’t charge extra if the work runs long.
Typical duct sealing runs $340-$620, flex duct replacement is $180-$340 per run, and extensive metal repair or full-system work ranges $890-$1,450 depending on home size and accessibility. Every CleanRun estimate is a written flat price for the complete scope, not a per-vent figure that grows once work starts. Call (224) 351-9772 for an exact quote - estimates are free.
Yes. We’ve repaired and sealed ductwork connected to hundreds of Honeywell and Aprilaire units in Northbrook and surrounding suburbs, and we stock common hardware for both brands. The duct repair work is independent of the equipment brand in most cases, but our familiarity with Honeywell zoning systems and Aprilaire media cabinets means we don’t damage integrated components during access.
We don’t use “emergency” as a marketing category because duct issues rarely require middle-of-night response, but we do answer calls live 24/7 and prioritize significant air loss or safety concerns within 24 hours. A completely disconnected duct in winter that risks pipe freezing would qualify. For standard scheduling, most Northbrook customers book 3-5 days out.
Every job is backed by the 365-Day Done Right Promise in writing: if the work is not right, CleanRun makes it right. Haven Standard Clause 5: Accountable Work. This covers material defects and workmanship for 365 days from completion. It does not cover new damage from pests, construction, or subsequent HVAC modifications, but we document system condition at completion so any future issue has a clear baseline.
Clear a 3-foot path to your attic access, basement mechanical room, and any crawlspace hatches. Remove fragile items from shelves near work areas where vibration might occur. You don’t need to move furniture or cover belongings; our crews use drop cloths and containment as needed. We also ask that pets be secured away from work areas for their safety and our technicians’. Call (224) 351-9772 to schedule - we’ll confirm these details when we book.
Schedule Your Duct Repair & Sealing Service in Northbrook Today
Call (224) 351-9772 to speak with a live person and schedule your free estimate. You’ll receive a written price before any work starts, a Documented Photo Record of every duct run when the crew leaves, and the 365-Day Done Right Promise in writing. No per-vent pricing, no coupon bait-and-switch, no call for a quote. Haven Standard Clause 1: The price is the price.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Northbrook, serving Northbrook since 2013.