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 Diamond Bar Homeowners
Leaky, disconnected, or crushed ductwork in a Diamond Bar home typically costs between $350 and $1,400 for our Air Duct Repair in Diamond Bar, depending on how much of the system has failed and whether sections need replacement rather than patching. Most repair jobs we handle are completed in a single visit once the problem is located. Alan Merritt and our team at Duct Cleaning Diamond Bar bring professional-grade diagnostic tools to every call, because a duct system that isn’t sealed is quietly undoing everything your HVAC system is trying to do. If you’ve noticed uneven room temperatures, rising energy bills, or dust settling back on surfaces within days of cleaning, call us at (877) 693-6770 for a straight answer and a free estimate.
HVAC Duct Installation
HVAC Duct Installation is the process of designing and fitting an entirely new ductwork system for a home, whether it’s a new build, an addition, or a full replacement of old metal or flex duct that’s collapsed beyond repair. In Diamond Bar, we see this most often in homes built in the 1970s and 1980s where original ductwork has rusted at the seams or been chewed through by rodents. A full HVAC duct installation for a typical single-story Diamond Bar home runs between $3,000 and $7,500, varying with square footage, accessibility, and whether the job calls for rigid metal or insulated flex. We size every run to the room it serves, because a duct that’s oversized is just as inefficient as one that’s too small.
New Construction and Additions
When a room addition goes in, the existing system rarely has the capacity or the layout to serve it properly. We calculate static pressure and airflow requirements so the new ductwork balances with the old, rather than starving the farthest rooms. Rotobrush rotary systems don’t apply here – this is measured, cut, sealed, and tested work.
Full System Replacement
There’s a point where patching stops making sense. If more than a third of your ductwork is compromised, a clean install often costs less over five years than chasing leaks piecemeal. We’ll show you what we found with photos before recommending that route.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
Air Duct Replacement
Air Duct Replacement means removing damaged or degraded sections of ductwork and installing new material in their place, rather than attempting to clean or patch them. Homeowners in Diamond Bar typically pay between $1,200 and $4,500 for partial air duct replacement, while whole-home replacement falls in the $3,000 to $7,500 range. The right call depends on whether the damage is isolated – say, a crushed return under one hallway – or widespread corrosion and fiberglass breakdown across the entire attic. We stock common sizes of rigid and flex duct on our trucks, so replacement work often moves faster than you’d expect.
When Cleaning Isn’t Enough
Cleaning can’t fix a duct that has collapsed, separated at a joint, or rusted through. In Diamond Bar, summer heat accelerates metal fatigue in attic ductwork, and winter brings rodents looking for warm air paths. If we open an access panel and find a duct hanging loose, replacement is the only honest recommendation.
Materials We Use
We install insulated flex duct where flexibility matters and rigid galvanized metal where durability is the priority. Both get mastic-sealed at every joint – not duct tape, which fails within a season. Sealed joints are what keep conditioned air in the duct and attic dust out.
Ductwork Repair
Ductwork Repair is the targeted diagnosis and correction of specific failures in an existing duct system: separated joints, crushed sections, poorly sealed connections, and holes that leak conditioned air into the attic or crawlspace. Most Diamond Bar repair jobs we do run between $350 and $1,400, depending on access and how many points of failure we find. The real problem with leaky ductwork is that it doesn’t announce itself – it just shows up as a hotter upstairs, a colder back bedroom, and a utility bill that creeps up month after month. Alan Merritt’s approach is to find every leak, not just the obvious one, because a duct system is only as strong as its worst joint.
Sealing Leaks and Joints
We seal connections with fiberglass mesh and water-based mastic, the same method used in commercial and remediation work. This isn’t cosmetic. A properly sealed joint can reduce duct leakage by 20 to 30 percent in older homes, which translates directly to lower energy costs.
Crushed and Restricted Sections
Storage boxes, attic renovations, and careless cable installers crush flex duct more often than homeowners realize. A duct flattened to half its diameter can cut airflow to a room by more than half. We locate restrictions, restore or replace the affected run, and often find several spots the homeowner didn’t know existed.
Duct Replacement
Duct Replacement refers to removing and replacing all or a substantial portion of a home’s ductwork in one project, usually because age, moisture damage, or pest intrusion has made piecemeal repairs uneconomical. In Diamond Bar, full duct replacement typically costs between $3,000 and $7,500 for an average single-family home, with partial replacement starting around $1,200. We don’t push full replacement unless the evidence supports it. When we do recommend it, we’ll show you photos of what we found: rust, collapsed flex, rodent nesting, fiberglass shedding – the things that explain why your air quality and comfort haven’t improved despite regular cleaning.
Full vs. Partial Replacement
A partial replacement makes sense when damage is confined to one branch line or one section of the return. Full replacement is the better investment when the majority of the system shares the same age, the same material, and the same failure pattern. We’ll quote both options when both are viable, and tell you which one we’d pick if it were our house.
Restoring System Efficiency
Replacing leaky ductwork isn’t just about air quality – it’s about recovering the efficiency your HVAC unit was rated for. The Department of Energy has long noted that typical duct systems lose 20 to 30 percent of conditioned air to leaks and poor connections. Closing that gap is often the single most effective energy upgrade a Diamond Bar homeowner can make.
Ductwork Installation
Ductwork Installation covers the complete process of laying out, sizing, hanging, and sealing new ductwork where none previously existed or where the old system has been fully removed. For Diamond Bar homes, a new ductwork installation generally runs from $3,000 to $7,500 depending on home size, number of runs, and attic accessibility. We approach every installation as a system design problem, not a parts-delivery job. Each room’s airflow requirement is measured, each register location is chosen for throw and return balance, and every connection is sealed before we call the job done.
Sizing for Real Airflow
A duct that’s too small whistles and starves the room. A duct that’s too large loses velocity and feels weak at the register. We size each run based on the room’s square footage, window exposure, and the HVAC unit’s actual blower capacity – not a rule of thumb. Diamond Bar’s hot, dry summers punish undersized systems hard.
Balancing the System
Balancing dampers, proper return placement, and well-sealed transitions are the difference between a system that keeps every room comfortable and one that makes the thermostat a battleground. We set dampers during installation and walk you through how to make small seasonal adjustments yourself. Most Diamond Bar homes we service have never had their airflow balanced – the original builder didn’t do it.
Brands We Service
We work with Honeywell air quality systems on a regular basis, including their whole-home filtration and ventilation products. When your ductwork is repaired or replaced, we make sure it integrates cleanly with your existing Honeywell controls and filtration setup, so one half of the system isn’t fighting the other. Our team understands how Honeywell’s air quality ecosystem talks to your HVAC equipment, which means we don’t create new problems while fixing old ones.
Most Diamond Bar homes with upgraded filtration run either Aprilaire or Honeywell equipment. We service both, and we’re particularly familiar with Aprilaire’s media filter housings and how they should be sealed into the duct system. A filter housing that leaks around its frame lets unfiltered air bypass the filter entirely – a common issue we correct during repair and replacement work. If you have a different brand or an older system with no filtration upgrades at all, we can still help; the ductwork itself is the same science either way.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Rooms that never reach the thermostat setting. If one bedroom is always five degrees hotter or colder than the hallway, the problem is usually airflow, not the HVAC unit. A disconnected or crushed duct restricts delivery to that room, and the thermostat never knows because it’s sitting in the hallway.
- Dust returning within days of cleaning. Clean air passing through a leaky duct system picks up attic dust, insulation fibers, and whatever else is up there. If your surfaces need dusting twice a week, your ducts are likely pulling in unfiltered air through gaps and holes.
- A jump in energy bills without a change in usage. Leaky ductwork can waste 20 to 30 percent of the air your system conditions. That’s a direct utility bill increase. Diamond Bar summers make this one easy to spot when July and August bills outpace last year’s by a wide margin.
- Whistling, rattling, or banging from the vents. Air rushing through a gap or a loose damper makes noise. So does a duct that’s come disconnected and is slapping against framing as pressure changes. These aren’t quirks to live with – they’re failures telling you where they are.
- Visible damage, rust, or pest evidence in the attic. If you’ve seen droppings, nesting material, or rusted duct surfaces during attic trips, it’s time for a professional assessment. Rodents chew through flex duct for nesting material, and rusted metal ducts eventually separate at the seams. We find both regularly in Diamond Bar homes.
Our Process, Step by Step
- 1
System inspection and airflow testing. We start by mapping the duct system: supply runs, return paths, register locations, and accessible attic or crawlspace sections. We check static pressure at the air handler and compare register airflow from room to room. The differences tell us where the system is failing before we ever open a panel.
- 2
Visual inspection with documentation. We access the ductwork and inspect every joint, seam, and section we can reach. Photos are taken throughout, so you see exactly what we see – no mystery diagnoses, no upselling based on claims you can’t verify. Alan Merritt reviews the findings personally before we discuss repairs with you.
- 3
Flat-price proposal before work begins. You get one price for the repair or replacement, agreed before we start. Not an estimate that assumes the best case and inflates later. We tell you what needs fixing, what can wait, and what it costs to do it right.
- 4
Repair or replacement with proper sealing. We cut, fit, and seal every section using mastic and fiberglass mesh at the joints. Crushed flex is replaced. Loose connections are re-fitted and secured. Every repair is made to stay put, not to survive until the next service call.
- 5
Post-repair verification and walkthrough. We re-test static pressure and room-by-room airflow, comparing the numbers to our initial readings. Then we walk you through what we found, what we fixed, and where things stand. You get the before-and-after numbers, not just a receipt.
How Much Does Air Duct Repair Cost in Diamond Bar?
A typical our Air Duct Repair in West Covina runs anywhere from $350 for a single separated joint or small hole to $1,400 for multiple failures across several runs of ductwork. If the damage is extensive enough to warrant partial or full replacement, expect $1,200 to $4,500 for a section or $3,000 to $7,500 for a whole-home air duct replacement. Accessibility drives a lot of the variance – attics with tight clearances take longer, and crawlspace work costs more than open-attic access. The material you’re repairing matters too: rigid metal is usually patchable, while old fiberglass-lined or badly crushed flex often needs replacing outright.
What affects the price most is how much of the system is failing and how hard it is to reach. A one-room repair on an exposed attic run is quick work. A leak buried in a finished ceiling chase or a crushed line under a low crawlspace is a different job. To avoid overpaying, insist on photos of the damage and a flat price before work begins. Our estimates are free, include a full system inspection, and come with a written scope of work. Call (877) 693-6770 to schedule one. We service Diamond Bar and the surrounding communities, and we’re happy to send a technician to your home at a time that works for you.
Our Service Area Near Diamond Bar
We serve Diamond Bar and the surrounding communities across the San Gabriel Valley, including Valinda, South San Jose Hills, Walnut, Pomona, Chino Hills, and Brea. Our technicians are based locally and know the housing stock here – the split-level attics, the tight crawlspaces, the 1980s flex duct that’s nearing the end of its service life. If you’re in a neighboring city, we can usually schedule you within a few business days. Call (877) 693-6770 to check current availability for your area.
Serving Diamond Bar, CA – Our Local Coverage Area
We’re based in the Diamond Bar 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 About Air Duct Repair in Diamond Bar
Air Duct Repair – South San Jose Hills is the process of finding and fixing leaks, disconnections, crushed sections, and deteriorated materials in your home’s ductwork system. In Diamond Bar, the most common repairs we perform are re-sealing separated joints, replacing crushed flex duct, and patching or replacing rusted metal sections. The goal is always the same: keep conditioned air moving from your HVAC unit to each room without losing it into the attic or crawlspace.
Most repair jobs are completed in two to five hours, depending on access and the number of failures. A single disconnected joint can be fixed in under an hour once we’re in the attic. A multi-room repair with duct replacement might take a full day. We’ll give you a time window when we schedule, and we honor it.
Air Duct Repair – Valinda typically costs $350 to $1,400 for targeted repairs, with full duct replacement running $3,000 to $7,500. The single biggest variable is access – attic work is faster than crawlspace work. Call (877) 693-6770 and we’ll give you a free, flat-price estimate based on your actual system, not a phone guess.
Yes. We regularly integrate duct repair and replacement work with existing Honeywell filtration and ventilation setups. We understand how Honeywell controls interact with your HVAC blower and duct pressure, and we make sure repairs don’t compromise your filtration performance. If your Honeywell system needs its filter housing re-sealed into the ductwork, we handle that as part of the job.
Most duct failures are urgent in the sense that they waste energy and degrade air quality, but they’re not the kind of emergency that requires a middle-of-the-night callout. That said, we do prioritize jobs where a disconnection is pulling attic insulation directly into the living space. Call us at (877) 693-6770 and we’ll give you an honest assessment of how quickly you should act.
Our repair and replacement workmanship is backed by a written warranty covering the sections we serviced. The specific terms depend on the scope – a sealed joint carries a different warranty than a full duct replacement. We’ll spell out exactly what’s covered in writing before any work begins, not after.
Clear a path to your attic access or crawlspace entrance, and move any furniture that blocks register access inside the home. If you have pets, we ask that they be secured in a separate room while we’re working. We’ll bring drop cloths and Guardsman-grade surface protection to keep your floors and furnishings clean throughout the visit. Alan Merritt personally ensures every job site is left as clean as we found it.
Schedule Your Air Duct Repair Service in Diamond Bar Today
Leaky ductwork doesn’t fix itself, and every month it runs is a month of wasted energy and circulating attic dust. Call (877) 693-6770 to schedule a free inspection and flat-price estimate. We’ll show you exactly what’s wrong, what it costs to fix, and we won’t start a single cut until you approve the number. Alan Merritt and the team at Duct Cleaning Diamond Bar are ready when you are.
Written by Alan Merritt, Owner at Duct Cleaning Diamond Bar, serving Diamond Bar and the San Gabriel Valley.