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 Castro Valley Homeowners
Leaky or disconnected ductwork quietly works against your HVAC system, pushing conditioned air into attics and crawl spaces where it does nobody any good. In Castro Valley, where homes range from 1960s ranchers to newer builds, compromised ducts are a common culprit behind uneven room temperatures, rising utility bills, and dusty air that never quite clears. We repair the full run of ductwork, seal it properly, and leave you with a system that actually delivers what it should. Call (855) 382-9257. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
HVAC Duct Installation
HVAC Duct Installation is the process of fitting new duct runs where none existed before, often during a home addition, a garage conversion, or a system retrofit. Castro Valley homes occasionally get new square footage without adequate airflow planning, and the result is a room that never reaches the thermostat setting. We design the run, size it to the HVAC unit’s output, and install it so static pressure stays balanced across the system. Typical whole-home installation projects in Castro Valley run from $2,800 to $6,200 depending on home size, access difficulty, and the number of supply and return points required.
Sizing and Airflow Design
An oversized or undersized duct run creates problems from day one. We calculate airflow needs per room, not by guesswork.
Every new run gets sealed at the joints with mastic or foil tape rated for HVAC use, never drywall tape or cheap plastic.
Integration With Existing Systems
New ductwork needs to work with your current furnace or AC unit, not against it. We check static pressure before and after the installation to confirm the blower is operating within its design curve.
That keeps efficiency where it belongs and avoids shortening the life of a perfectly good HVAC unit.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
Air Duct Replacement
Air Duct Replacement means removing compromised ductwork and putting in new runs in the same location. You typically need this when ducts are crushed, rusted through, heavily contaminated with mold, or simply too leaky to justify more patching. We remove the old material, inspect the plenum and boots, and install replacement duct that meets current code for insulation and sealing. Full replacement in an average Castro Valley home usually falls between $3,200 and $7,800, with the final number driven by the number of runs, crawl space or attic access, and the type of duct specified.
When Repair Is No Longer Enough
Ducts with multiple failed joints, widespread rodent damage, or collapsed inner liners cost more to patch than to replace. We tell you honestly when replacement is the cheaper long-term fix.
If the metal itself has rusted through or the flex duct has torn, a patch simply moves the leak elsewhere.
Removal and Remediation
Old ductwork can hold dust, pet hair, and sometimes fiberglass particles that have broken loose over the years. We remove it carefully and clean the surrounding area before new duct goes in.
That keeps contaminants from being sealed back into the new system.
Ductwork Repair
Ductwork Repair addresses specific failures in an otherwise sound system: separated joints, punctures, loose boots, or crushed flex runs. Castro Valley attics and crawl spaces put a real strain on ductwork, especially in summer when temperatures climb and materials expand. We locate the failure, re-secure or replace the affected section, and seal it so air stops escaping. Most repair jobs run between $350 and $1,200 depending on how many sections are failing and how difficult the access is.
Finding Leaks That Skip the Obvious
A disconnected boot behind a wall or a separated seam in a dark attic rarely announces itself. We trace each run and test connections rather than assuming the problem is only where dust is visible.
This catches the secondary leaks that would otherwise undo the repair within a season.
Sealing to Stop Air Loss
A proper duct seal uses mastic or UL-rated foil tape, applied to clean metal. Duct tape, the household stuff, dries out and fails; we do not use it.
Sealed joints mean the air you paid to condition reaches the room it was meant for.
Duct Replacement
Duct Replacement is the umbrella term for swapping out failing sections of a duct system, either a single run or the whole layout. When a Castro Valley homeowner has a crushed section in a crawl space or a flex run that rodents have torn through, replacing that run is usually the most durable fix. We match the new duct to the existing system so airflow stays consistent and resistance stays low. Single-run replacement typically costs between $450 and $1,400, while replacing an entire system may run higher depending on the home’s size and duct layout.
Matching Materials to Conditions
An attic duct lives a different life than a crawl space duct. We specify insulated flex or rigid metal based on where the run sits and what temperature swings it will face.
Castro Valley summers are not extreme, but unconditioned attics still get warm enough to test cheap materials.
Protecting Against Rodents
Rats and mice chew ductwork for nesting material and for access. We advise on sealing entry points and use replacement materials less inviting to pests where the home’s history suggests repeat problems.
That reduces the chance you will be paying for the same repair again next year.
Ductwork Installation
Ductwork Installation covers building out a complete or partial duct system, whether for new construction, a major remodel, or replacing a system that was never installed correctly. Castro Valley has its share of older homes with undersized or badly routed ductwork from previous decades. We build it right: proper sizing, sealed joints, insulated runs where they pass through unconditioned space, and a test of the finished system’s airflow. New ductwork installation on a typical Castro Valley home ranges from $3,500 to $8,000, with large or complex layouts exceeding that.
Code-Compliant From the Start
California energy codes set minimum requirements for duct insulation and sealing. We build to those standards so your system passes inspection and performs efficiently.
Ask your city’s building department about permit requirements for your specific project; requirements vary.
Balanced Air Distribution
Rooms at the end of a long duct run often starve for air while rooms near the unit get too much. We design runs with balancing dampers where appropriate so each room gets its share.
That means fewer hot and cold spots and a system that does not overwork the blower.
Brands We Service
We work on duct systems connected to every major HVAC brand, and we know the common failure points on each. Honeywell controls and zoning systems integrate tightly with ductwork; when a zone fails to respond, the issue often sits in the duct as much as the damper. Rotobrush equipment has been part of our process long enough that we recognize how its agitation patterns compare to what we find inside residential Castro Valley ducting.
Nikro HEPA extraction is part of our service stack, which means the same equipment we trust for cleaning is present when we open a duct for repair. Whether you have Honeywell, Rotobrush, Nikro, Guardsman, or any other make, we can help.
See the difference
Before
After
Before
After
Before
AfterSigns You Need a Pro Right Now
- Rooms that never reach temperature. If one bedroom stays cold in winter or warm in summer no matter the thermostat setting, you likely have a disconnected or leaking run. The air is being produced, it just is not arriving.
- Dust returns quickly after cleaning. Leaky return ducts pull in attic or crawl space air, which carries dust and insulation particles. If surfaces coat over within days, the system is breathing from the wrong places.
- Higher utility bills without a hotter summer. Leaky ducts waste conditioned air, and the HVAC system runs longer to compensate. You pay for air that never reaches a room.
- Visible damage in the attic or crawl space. Crushed flex, separated joints, or torn insulation are visible signs the duct is failing. These problems do not fix themselves and get worse as temperatures cycle.
- Musty or stale air from the vents. A return duct pulling from a damp crawl space brings that odor into the living space. The fix is sealing the duct, not masking the smell.
Our Process, Step by Step
- 1
Inspect the entire duct system. We trace every accessible run, open the plenum, and check boots and joints. The goal is a complete map of where air is going and where it is being lost.
- 2
Test for leaks and airflow. We look at static pressure and room-by-room airflow to identify which runs are underperforming. This tells us whether the issue is a single failure or a system-wide problem.
- 3
Present a written repair plan. You get a flat price for the repair before any work begins. No per-vent pricing, no surprises added after we start.
- 4
Repair or replace the affected ductwork. We repair separated joints, replace crushed or torn sections, and seal everything with mastic or UL-rated foil tape. The work is done to code and tested after it is complete.
- 5
Show you the work. Before-and-after photos document what was wrong and what we fixed. You see the repair, not just an invoice.
How Much Does Air Duct Repair Cost in Castro Valley?
A typical air duct repair in Castro Valley runs between $350 and $1,200 for a single failure, such as a separated joint or a crushed flex run. Replacing a full run costs more, typically $450 to $1,400, because the new duct material and the labor to pull and hang it add up. Whole-system replacement lands between $3,200 and $7,800, and new ductwork installation on a larger home can exceed $8,000. These are estimated ranges based on common Castro Valley housing stock; the written estimate sets the final price.
What moves the price: access difficulty, the number of runs affected, the type of duct material required, and whether insulation needs to be replaced around the duct. The cheapest quote is often the most expensive repair because a hurried patch leaves secondary leaks untouched. A free estimate should include a written scope of work, a flat price per job, and time to answer your questions. Ours does. Call (855) 382-9257 for an exact quote. We answer 24/7.
Our Service Area Near Castro Valley
We serve Castro Valley and the surrounding East Bay communities, including Castro Valley, Walnut Creek, Danville, Foster City, Lafayette, San Lorenzo, Ashland, Cherryland, Fairview, and Moraga. Most repair jobs are scheduled quickly, with fast dispatch from 7am to 7pm, Sunday through Friday. For the broader picture of what we do, start with our Duct Cleaning Castro Valley page.
Serving Castro Valley, CA – Our Local Coverage Area
We serve Castro Valley 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 Castro Valley
Air Duct Repair is the process of finding and fixing failures in your HVAC duct system: separated joints, punctures, crushed runs, loose boots, and leaky connections. It restores the system’s ability to move conditioned air from the furnace or AC unit to the rooms that need it. It is often the missing step between a clean duct system and an efficient one.
Most single-repair jobs in Castro Valley take two to four hours from inspection to final seal. Larger jobs, like replacing multiple runs, can take a full day or more. We give you a time estimate with the written quote so you know what to expect.
Single repairs typically run $350 to $1,200, whole runs cost $450 to $1,400 to replace, and full system replacement lands between $3,200 and $7,800. The written estimate sets the final price before any work starts. Call (855) 382-9257 for a free estimate. We answer 24/7.
Yes, we service ductwork connected to Honeywell, Rotobrush, Nikro, Guardsman, and every other major HVAC brand. The duct system is largely brand-independent, but we know the specific integration points that matter for each. Whether you have Honeywell or any other make, we can help.
Same-day service is often available. Call (855) 382-9257. We answer 24/7. Fast dispatch 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 stand behind our repair work. Ask about specific warranty terms when you call for your estimate, as warranty details vary by job type and materials used. We will put any warranty terms in writing as part of your estimate.
Clear a path to the attic hatch or crawl space access and move anything fragile away from the vents we will be working on. Keep pets in a separate room while we work. We handle the rest, including cleanup after the repair is complete.
Schedule Your Air Duct Repair Service in Castro Valley Today
Leaky ducts do not heal themselves, and every season they leak, you pay to condition air that never reaches a room. Call (855) 382-9257 for a free, no-obligation estimate. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. One flat price per job, agreed before we start.
Written by Frank Peralta, Owner at Duct Cleaning Castro Valley, serving Castro Valley since 2012.