Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Trusted Air Duct Repair for St. Louis Homeowners
When a duct comes apart behind a wall or a run crushes flat under a floor joist, your furnace keeps running and your rooms keep losing air. Bellmont Air Duct Cleaning repairs that ductwork instead of just vacuuming around it. Our technicians have up to 9 years of experience, and they arrive with professional-grade Rotobrush and Nikro equipment plus Abatement Technologies containment gear, so we can diagnose a problem, open the right access, and fix it on the same visit. We’re licensed and insured, we set one flat price per system before any work starts, and we show before-and-after photos of the ducts we handled. Same-day repair is often possible in St. Louis when you call early. Reach us at (877) 349-6189 for a free estimate; we answer 24/7 and dispatch from 7am to 7pm, Sunday through Friday.
HVAC Duct Installation
HVAC Duct Installation is the work of building a new duct system or tying new runs into an existing one so that conditioned air reaches every room the way the equipment was designed to deliver it. You need it when a room never got proper ducting, when an addition needs its own supply and return, or when a remodel moved walls and the old layout no longer fits. Bellmont Air Duct Cleaning handles the duct side of that work as a specialist, not a general contractor: we size the runs, fit them with sealed joints, and check airflow at each register before we leave. Typical installation runs $900 to $4,500 depending on how many runs are involved and how accessible the attic, basement or crawlspace is. The written estimate sets the final price.
Sizing Runs for Real Airflow
A duct that’s too small chokes the room it serves, and one that’s oversized moves air too slowly to feel. We measure static pressure and check register velocity so the sizing is based on how the system actually behaves. That step is what separates a duct installation that works from one that just looks finished.
Sealing Every Joint We Build
New ductwork only performs as well as its connections. We seal the joints and seams we install so the air you paid to cool or heat lands in the room instead of the joist cavity. That matters in older St. Louis housing stock, where joist spaces often connect straight to the outside air.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
Air Duct Replacement
Air Duct Replacement means removing duct runs that are past saving and putting new ones in their place. It’s the right call when duct board is crumbling, when flex duct has torn and collapsed in several places, or when a previous installation was done with materials that won’t hold up. Bellmont Air Duct Cleaning evaluates the existing system first, because replacing a run that only needs a repair wastes money. When replacement is the honest answer, we pull the old duct, install new insulated runs, and confirm airflow at the registers afterward. Typical air duct replacement in St. Louis runs $1,200 to $5,500 depending on the number of runs and how much wall or ceiling needs to be opened. We confirm the range in a written estimate before we begin.
When Repair Stops Making Sense
Patch on top of patch is a warning sign. If more than a small share of a run is damaged, or the duct material itself is breaking down, new duct costs less over the next few years than repeated repairs. We’ll tell you which side of that line your system sits on.
Choosing Duct Materials That Last
We match the material to where the duct lives. Attic runs face summer heat that basement runs never see, and flexible duct in an unconditioned space needs proper support and insulation to hold its shape. Getting that right is most of the difference between a replacement that lasts and one that sags in a couple of years.
Ductwork Repair
Ductwork Repair covers the fix work: resealing separated joints, reconnecting a run that’s come loose from a boot, patching a puncture, or replacing a crushed section with rigid duct. You need it when a room runs hot or cold while the rest of the house is fine, when you hear a rattle or whistle at a register, or when a recent cleaning turned up disconnected runs behind a wall. Bellmont Air Duct Cleaning can repair what we find on the same visit as a cleaning, so you’re not hunting for a second contractor. Typical ductwork repair in St. Louis runs $180 to $650 depending on access and how many joints are involved. A written estimate sets the final price.
Sealing Leaks at the Source
Leaky joints bleed conditioned air into wall cavities and attics, and the loss shows up on your utility bill before it shows up anywhere else. We seal with duct mastic and proper backing rather than tape alone, because tape fails in the temperature swings a St. Louis summer brings. Sealing at the joint is cheaper than replacing the run, and it’s often the whole fix.
Restoring Crushed and Disconnected Runs
Flex duct crushed behind a joist or pulled loose at a boot can’t move its rated airflow. We open the access we need, rebuild the run with rigid duct where it’s pinched, and reattach it properly at the register. Then we check the register again to confirm the fix did what it was supposed to.
Duct Replacement
Duct Replacement is the section-by-section swap of failing duct runs, and it’s usually done while the rest of the system stays in place. It’s the practical answer when one wing of a house has duct that’s aged out or was installed badly, and the rest is sound. Bellmont Air Duct Cleaning scopes it run by run so you’re not paying to replace duct that’s still doing its job. We remove the old material, install new insulated duct with sealed connections, and test airflow at each affected register. Typical duct replacement runs $600 to $2,400 for a defined section, depending on run count and how much access has to be created. The written estimate sets the final number.
Targeting the Failing Sections
Not every duct in a house fails at the same rate. Runs in an unconditioned attic or a damp crawlspace age faster than the ones inside the conditioned envelope. We map which sections are actually compromised so the replacement budget goes where the loss is.
Keeping the Rest of the System Running
A section replacement shouldn’t shut down your heat or cooling for long. We plan the work so the rest of the system stays connected, and we don’t leave open ductwork where it can pull attic or crawlspace air into the house. Clean containment is part of the job, not an extra.
Ductwork Installation
Ductwork Installation is putting new duct in where none existed or where the layout has to change: a finished basement that needs supply and return, a kitchen remodel that moved the register, or a converted garage now used as living space. It calls for someone who understands airflow, not just someone who can run flex. Bellmont Air Duct Cleaning designs the layout, installs the runs, seals the joints, and balances the system so the new space gets its share of conditioned air without starving the rooms that were already there. Typical ductwork installation in St. Louis runs $700 to $3,800 depending on the number of runs and how much framing or drywall has to be opened. The written estimate sets the final price.
Planning the Layout Before Cutting
A duct layout is easier to get right on paper than in a wall cavity. We plan the run paths, register locations and return sizing first, then confirm they fit the actual framing. That planning step keeps a small installation from turning into a much bigger opening.
Balancing New Runs With Existing Ones
Adding duct changes how air splits across the whole system. After installation we measure at the registers and adjust dampers so the new runs don’t rob the rest of the house. Otherwise the new room gets comfortable and the old rooms don’t.
Brands We Service
We work with Honeywell and Aprilaire whole-home air quality equipment, and we know where that gear tends to wear out: bypass dampers that stop seating, humidifier pads that scale up, and control connections that drift out of adjustment. If your duct repair touches a humidifier or an air cleaner tied into the ductwork, we can service it as part of the same visit rather than leaving it for a different trade.
Our cleaning and containment work relies on Rotobrush and Nikro extraction systems and Abatement Technologies HEPA equipment, the kind of gear industrial indoor-air contractors use. That matters when a repair opens ductwork and we need to capture debris instead of spreading it through the house. Whether you have Honeywell or Aprilaire or any other make, we can help.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- A room that never gets comfortable. If one room runs hot in summer and cold in winter while the rest of the house is fine, the duct serving it is usually the reason. That points to a disconnected or crushed run more often than a failing furnace.
- Whistling or rattling at a register. A whistle means air is being forced through a gap that’s too small, and a rattle often means a joint has come loose. Both are cheap to fix early and expensive once the duct separates fully.
- Visible dust streaks near a vent. Streaking around a register usually means the seal between the boot and the drywall or the duct behind it has opened up. That gap pulls attic or wall cavity air straight into the room.
- Duct that’s torn, crushed or disconnected. Flex duct that’s been stepped on in an attic or pinched behind a joist can’t deliver its rated airflow, and a disconnected run dumps conditioned air into a space nobody uses. This is the most common repair we make.
- Rising energy bills with no other explanation. When the bill climbs and the equipment is fine, leaking ductwork is a strong suspect. Sealing joints and repairing separated runs often brings the loss back under control.
Our Process, Step by Step
- 1
Phone consultation and free estimate. We ask what you’re seeing and when it started, then set a visit. Call (877) 349-6189. We answer 24/7, with fast dispatch from 7am to 7pm, Sunday through Friday.
- 2
System inspection and diagnosis. We trace the duct runs, check connections at boots and plenums, and measure airflow and static pressure where it helps. Pressure readings tell us whether the problem is a single run or the whole system’s balance.
- 3
Written scope and flat price. You get the repair scope and one flat price per system before we start. No per-vent pricing, no number that changes once the technician is on site.
- 4
Repair with proper containment. We set up Abatement Technologies HEPA containment so opening ductwork doesn’t spread dust through the house. Rotobrush and Nikro extraction handle debris as we go, and we repair the duct with sealed joints and rigid material where flex has failed.
- 5
Verification and photos. We recheck airflow at the affected registers and take before-and-after photos of the ductwork so you can see what changed. If a follow-up visit is needed, we tell you then rather than leaving it open.
How Much Does Air Duct Repair Cost in St. Louis?
Air duct repair in St. Louis typically runs $180 to $650 for common fixes like resealing joints or reconnecting a loose run. Larger jobs scale up from there. A typical partial duct replacement runs $600 to $2,400, and a full air duct replacement across a whole house lands between $1,200 and $5,500. New HVAC duct installation for an addition or remodel runs $900 to $4,500, and ductwork installation for a single new space starts around $700.
What moves the price most is access. A joint you can reach from the basement is a short job; the same joint behind finished drywall in a Clayton second floor takes longer to reach and to close back up. The number of runs involved, the duct material, and whether the repair turns into a section replacement all shift the range. Here’s what we include in every free estimate:
- A walk of the accessible duct runs and a check at each register that’s affected
- A written scope naming what gets repaired or replaced
- One flat price per system, agreed before work starts
- Before-and-after photos of the ductwork we handled
How to avoid overpaying: ask whether the quote is per system or per vent, get the repair scope in writing, and be wary of any price that drops sharply once you say you’ll think about it. Comparison shopping on duct repair works when every bid describes the same scope. Call (877) 349-6189 for an exact quote; estimates are free.
Our Service Area Near St. Louis
We work throughout St. Louis and the surrounding communities, including Clayton, University City, Webster Groves, Affton, Crestwood, Jennings, Ferguson, Overland, Lemay, St. Ann and Bellefontaine Neighbors. Homes in this area range from early-1900s brick four-squares with original ductwork to newer builds with flex runs in the attic, and each brings its own repair patterns. Dispatch runs from 7am to 7pm, Sunday through Friday, and same-day repair is often possible when you call early.
Serving St. Louis, MO – Our Local Coverage Area
We serve St. Louis and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
Frequently Asked Questions About Air Duct Repair in St. Louis
Air duct repair is the fix work on the duct system itself: resealing joints, reconnecting runs that have come loose, patching punctures, and replacing crushed sections. It’s separate from duct cleaning, which removes debris. Many homes need both at once, and we handle them on the same visit so you’re not scheduling twice. Call (877) 349-6189 for an exact quote; estimates are free.
Most single-run repairs take one to three hours on site. Section replacements and installations run longer, often a full day, depending on how much access has to be created. We give you a time window with the written estimate so you can plan around it. If the scope changes once we’re in the ductwork, we stop and confirm before proceeding.
Most repairs run $180 to $650, partial replacements $600 to $2,400, and full-system replacement $1,200 to $5,500. Installation work starts around $700 for a single new space. Every price is set by the written estimate before work starts, with no per-vent charges. Call (877) 349-6189 for an exact quote; estimates are free.
Yes, we service Honeywell and Aprilaire whole-home air quality equipment tied into your ductwork, along with Rotobrush, Nikro and Abatement Technologies gear on our own side of the work. When duct repair touches a humidifier or air cleaner, we can address it in the same visit. We don’t install HVAC equipment itself; our scope is the duct system and the air quality components connected to it.
Same-day repair is often possible when you call early in the day. We answer 24/7, and fast dispatch runs from 7am to 7pm, Sunday through Friday. A call outside dispatch hours is booked into the next opening, Sunday through Friday, 7am to 7pm. We’re closed on Saturday.
We stand behind the work with a satisfaction guarantee, and we’ll explain what it covers in writing with your estimate. The warranty applies to the repair we performed, so you know exactly what’s covered and for how long. If something isn’t right, call us and we’ll make it right.
Clear access to the furnace, the registers we’ll be working at, and any attic or crawlspace hatch helps the most. Move breakables away from those spots and let us know about pets so we can keep doors closed. You don’t need to clean anything first; we set up containment before we open any ductwork.
Schedule Your Air Duct Repair Service in St. Louis Today
If a room won’t heat evenly, a register whistles, or a recent cleaning turned up disconnected ductwork, our team at Bellmont Air Duct Cleaning can help. We’re licensed and insured, we set one flat price per system before work starts, and we show you before-and-after photos. Call (877) 349-6189. We answer 24/7, with fast dispatch from 7am to 7pm, Sunday through Friday. Estimates are free and there’s no obligation. For the full picture of how we handle St. Louis homes, start here.
Written by the team at Bellmont Air Duct Cleaning.