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Ductwork Replacement in San Jose, CA
Full ductwork replacement and redesign for Bay Area homes, sized room by room so your system actually delivers the air it produces. Licensed HVAC and electrical team, no subcontractors, up to a 12-year parts and labor warranty.
Serving Santa Clara & San Mateo Counties
Why Bad Ductwork Cancels Out a Good System
You can install the most efficient heat pump or AC on the market and still lose 20 to 30 percent of its output to leaking, undersized, or poorly designed ductwork. In older Bay Area homes, ducts are often the weakest part of the whole system: crushed flex runs in the crawlspace, disconnected joints in the attic, and returns that were never sized for the equipment they feed. The result is uneven temperatures between rooms, longer run times, higher bills, and a system that wears out early trying to compensate.
Ozone Service replaces and redesigns ductwork across San Jose, Sunnyvale, Palo Alto, Mountain View and within Santa Clara & San Mateo Counties, sizing every run to the actual room load, sealing every joint, and verifying airflow before we close the job. When ductwork replacement is done alongside a new system, one licensed team handles both under one contract and one warranty.
What's Included in Every Ductwork Replacement
The following are standard parts of every installation we do, not extras:
Duct Inspection and Airflow Testing
Before we quote anything, we inspect the existing duct system for leaks, disconnected joints, crushed runs, and undersized returns, and we measure static pressure to see how hard your system is actually working. This tells us whether you need a full replacement, a partial one, or targeted repairs. Guessing at ductwork is how installers end up replacing the right equipment through the wrong ducts.
Load-Based Duct Design
We size the new ductwork to the heating and cooling load of each room, not to whatever was there before. Supply and return runs are calculated for correct CFM room by room, so airflow is balanced across the house instead of dumping most of it into the closest rooms. Correct duct design is what turns rated equipment efficiency into actual comfort.
Removal of Old Ductwork
We remove and haul away the old duct runs, including deteriorated flex, disconnected metal, and failed insulation. No leaving torn ductwork in the crawlspace or attic for someone else to deal with later.
New Duct Installation and Sealing
New runs are installed to the design, and every joint is sealed with mastic, not just taped. Sealed ductwork keeps conditioned air inside the system instead of losing it into the attic or crawlspace. This is the single biggest driver of whether your new ducts hold their efficiency over time.
Permits and City Inspection
Ductwork replacement is permitted through the relevant city or county building department. We pull permits before work begins and pass city inspection before the job is closed out. Our inspection pass rate across San Jose and the Peninsula is 100%.
Airflow Verification and Commissioning
After installation, we remeasure static pressure and airflow, confirm the system is balanced room to room, and verify the equipment is operating within spec on the new duct system. We do not consider the job done until the numbers confirm it.
What Ductwork Work Do You Actually Need?
Not sure which one you need? We measure static pressure and airflow during the free estimate and tell you the smallest fix that actually solves the problem, not the biggest.
Duct Repair and Sealing
$400+
Best for: mostly sound duct systems with localized leaks or a few disconnected joints.
We seal leaking joints, reconnect and re-support runs, and re-test static pressure. The lowest-cost path when the design is fine and only the seal has failed.
Partial Replacement
Most Flexible
$580+ per register
Best for: homes where some runs are failed or undersized but the duct boot is reusable.
We replace the problem runs and returns, redesign the sections that were undersized, and tie them into the existing system.
Full Ductwork Replacement + Redesign
$620+ per register
Best for: older homes, pre-2000 builds, or any home getting a new system through aging ducts.
We remove the entire duct system and design a new one to your home’s room-by-room load, sized and sealed for correct CFM throughout. This is what most Bay Area ductwork projects turn out to need once static pressure is measured.
What a Heat Pump Actually Costs After Incentives
The gross cost of a heat pump installation is only part of the picture. Bay Area homeowners have access to three stacking incentive programs that significantly reduce out-of-pocket cost.
We identify which programs apply to your project, ensure the installation meets all rebate program requirements, and handle the documentation. Most contractors don’t touch the paperwork – we do.
Sample Сalculation
San Jose homeowner, heat pump installation, standard income:
SVCE
$2,500
CA Energy-Smart Homes
$5,750
Net savings
$8,250
Rebate availability changes quickly and is often first-come, first-served or waitlisted. We calculate your exact eligibility and current stacking options as part of the free estimate – no guesswork, no surprises.
Ready to know the Cost of your Ductwork project?
Contact us to schedule a Free estimate to know which option works best for your house
From First Call to Final Inspection
Step 1
Free Estimate and Duct Assessment
We visit your home at no charge, inspect the accessible duct runs in the attic and crawlspace, measure static pressure, and identify leaks, undersized returns, and failed sections. You leave with a written scope and price and a clear recommendation: repair, partial, or full replacement.
Step 2
Permits
We pull the required permit if needed through the city or county building department before work begins.
Step 3
Installation and Removal
We remove the old ductwork, install the new runs to the design, and seal every joint with mastic. Most residential ductwork replacements are completed in 1 to 2 days depending on scope and home access. We give you a specific timeline during the estimate.
Step 4
City Inspection and Commissioning
We remeasure airflow and static pressure, confirm room-to-room balance, and verify the system is operating within spec on the new ducts before we leave.
Why Bay Area Homeowners Choose Ozone Service for Ductwork
HVAC and Electrical Under One Roof
Ductwork rarely lives on its own. It is mostly replaced alongside heat pump or AC, and it often touches the electrical side too. We carry both HVAC and electrical licenses, so one team designs the ducts, installs the system, and handles any wiring under one contract and one warranty, with no finger-pointing between trades.
Designed to the Load, Not to What Was There
Most contractors reuse the old duct layout because it is faster. We run a room-by-room load calculation and design the ducts for correct CFM, so airflow is balanced and the system runs the way it was rated to. This is the difference between replacing ducts and fixing the problem.
Sealed and Tested, Not Just Installed
We seal every joint with mastic and verify the result with static pressure and airflow measurements before and after. A duct system that is not tested is a duct system nobody actually knows is working. Our inspection pass rate across San Jose and the Peninsula is 100%.
Recent Project: Redwood City
A full system replacement where the old undersized ductwork was the real problem. We removed the entire duct system, designed and sealed new ductwork for correct CFM room by room, and tied it into a new heat pump. Uneven temperatures between rooms were gone, and the homeowner's net cost dropped once incentives were applied. One team, start to finish, under one warranty.
Authorized Dealer & Installer
Real Repairs, Real Results
Our in-house team finished all of the projects shown here. They correctly diagnosed the problem, fixed it, and checked it before we left the house.
What Our Customers Say
Commercial Ductwork and Air Distribution
We replace and redesign duct systems for commercial properties across the Bay Area, including office suites, retail spaces, and multi-unit residential. Commercial ductwork follows the same process: airflow and static pressure assessment, load-based design, proper permitting, licensed installation, and city inspection. For rooftop-unit ductwork and larger air-distribution projects, contact us directly to discuss scope and timeline.
Frequently Asked Questions
How do I know if my ductwork needs replacing?
The most common signs are rooms that never reach the same temperature as the rest of the house, rising energy bills without a change in usage, weak airflow from some vents, and a system that runs constantly. During the free estimate we measure static pressure and inspect the runs, so the recommendation is based on the numbers, not a hunch.
Can you just repair my ducts instead of replacing them?
Often, yes, we can. If the design is sound and the problem is leaks or a few disconnected joints, sealing and reconnecting is the cheaper, smarter fix. We recommend full replacement only when the ducts are undersized, badly deteriorated, or wrong for the equipment they feed. We tell you the smallest fix that actually solves the problem.
Do I need to replace my ductwork when I install a new system?
Not always, but it is worth checking. Running a new high-efficiency system through old, leaking, undersized ducts wastes much of the efficiency you paid for. We assess the ducts during the system estimate and tell you honestly whether they can be reused, partially replaced, or need full replacement.
How much of the system's efficiency is actually lost to bad ducts?
Leaky or poorly designed ductwork commonly loses 20 to 30 percent of a system’s output before it ever reaches your rooms. That loss shows up as longer run times, uneven temperatures, and higher bills. Sealing and correctly sizing the ducts is one of the highest-return improvements in the whole system.
How long does ductwork replacement take?
Most residential ductwork replacements are completed in 1 to 2 days, depending on the size of the home, the scope of the replacement, and access to the attic and crawlspace. We give you a specific timeline during the estimate, before any commitment.
How disruptive is the work? Will you need to open walls?
Most duct runs are accessed through the attic and crawlspace, so wall openings are usually not needed. Where a run is inside a wall or ceiling, we discuss access and patching in the written scope before any work starts, so there are no surprises.
What materials do you use for new ductwork?
We match the material to the run: galvanized sheet-metal trunks where rigidity and longevity matter, and insulated R-8 flex for branch runs. Every joint is sealed with mastic, and the system is designed to ACCA Manual D so airflow is balanced room to room.
What warranty do you provide?
Up to 12 years on parts and labor. If something fails within the warranty period, we diagnose and fix it at no charge, with no trip fee and no diagnostic fee.
Get a Free Estimate for Ductwork Replacement
A licensed technician visits your home, measures your duct system, and gives you a written scope and price, including any incentives that apply to your project.
- go@serviceozone.com
- Serving Bay Area, 24/7
Serving the Greater Bay Area
* and other cities in Santa Clara, San Mateo, and Alameda counties
