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AC Installation & Replacement in San Jose, CA
Central AC and ductless mini-split installation for Bay Area homes and businesses. Upfront pricing, licensed EPA-certified technicians, no subcontractors, and a 3-year labor warranty, extendable up to 12 years with annual maintenance.
Serving Santa Clara & San Mateo Counties
The Most Efficient Way to Heat and Cool Your Bay Area Home
If your AC stopped cooling, drives up the electric bill, or is more than 12–15 years old replacement is almost always the smarter move. A new system costs less to run, breaks down less, and comes with a warranty that actually protects you.
AC installation in San Jose typically starts with $5500 for Central-air AC, and $3900 with mini-split systems before incentives, depending on system type, home size, and whether ductwork needs attention. Ozone Service handles the full scope: system selection, load calculation, ductwork assessment, permits, installation, and startup. One licensed team, one contract, one warranty covering everything.
What's Included in Every AC Installation
The following are standard parts of every installation we do, not extras:
Load Calculation
Before we recommend a system, we calculate the exact cooling load for your home. An oversized unit short-cycles, leaves the air humid, and wears out faster. An undersized unit runs constantly without ever reaching the setpoint. Correct sizing is the single most important variable in long-term performance and the step most contractors skip.
Ductwork Assessment
Existing ductwork is inspected for leaks, sizing, and airflow balance. Many Bay Area homes built before 2000 have undersized ducts that reduce system efficiency by 20–30%, regardless of the unit installed. If ducts are damaged or poorly designed, we redesign and replace them to match the new system’s airflow requirements.
Electrical Check
Modern high-efficiency AC systems draw more power than older equipment. We review your electrical panel as part of the free estimate. If a dedicated circuit or panel upgrade is needed, our licensed electricians handle it in-house – no separate contractor, no split warranty.
Permits & City Inspection
Every installation is permitted through the relevant city or county building department. We pull all permits before work begins, schedule the inspection, and pass it before the job is closed out. Our inspection pass rate across San Jose and the Peninsula is 100%.
System Startup & Commissioning
After installation, we verify refrigerant charge, airflow, thermostat calibration, and system operation before we leave. This step is where most contractors cut corners and where long-term reliability is either built or lost.
Written Labor Warranty
Labor is covered for 3 years, extendable up to 12 with annual maintenance, in writing. If something fails within the warranty period, we fix it – no diagnostic fees, no service charges.
Which Cooling System Is Right for Your Home?
Most Bay Area homeowners choose between three main configurations. The right choice depends on your home’s ductwork, square footage, and how you use different spaces.
Central AC System
$5500+
Best for: Homes with existing ductwork
Cools the entire home through existing ducts. Ductwork assessment included. Most cost-effective for whole-home cooling.
Ductless Mini-Split
Most Flexible
$3900+
Best for: Homes without ducts, ADUs, additions, garages
Individual wall units per zone. No ductwork required. Each zone controlled independently – no energy wasted cooling empty rooms.
Heat Pump System
$12500+
Best for: Homes without ducts, ADUs, additions, garages
One system handles both heating and cooling. Higher upfront cost, lower operating cost.
From First Call to a Cool Home: How We Work
Bay Area utility programs and state energy incentives may offset a significant portion of your cost. We check what applies to your home and handle all the paperwork – as part of your free estimate, at no charge.
From First Call to a Cool Home: How We Work
Step 1
Free Estimate & System Assessment
We come to your home, assess the existing system or space, measure the area, and evaluate your ductwork and electrical panel. No charge, no obligation. You leave with a written scope and price before you commit to anything.
Step 2
System Selection
We recommend the right system based on your home’s load calculation, not what’s most convenient for us. Central AC, ductless mini-split, or heat pump – we explain the trade-offs and let you decide.
Step 3
Permits
We pull all required permits through the city or county building department before work begins. Unpermitted installations void manufacturer warranties and create problems when you sell the home.
Step 4
Installation
Most AC installations are completed in 1 day. Projects that include ductwork repair or panel work may take longer – we give you a specific timeline during the estimate, not a vague window.
Step 5
Startup & Inspection
City inspection is scheduled and completed before the job is closed. We commission the system – verify refrigerant charge, airflow, and cooling performance – and walk you through the thermostat and maintenance basics.
Why Bay Area Homeowners Choose Ozone Service for AC Installation
HVAC and Electrical Under One Roof
AC installation often reveals electrical needs - dedicated circuits, panel capacity, and disconnect boxes. When your HVAC contractor and electrician are two separate companies, accountability disappears the moment something goes wrong. We carry both licenses. One team handles the full scope; one warranty covers everything.
No Subcontractors
Every technician who works on your home is a direct Ozone employee - background-checked, EPA-certified, and trained in-house. You know who's coming, and we stand behind their work with a full warranty.
100% Inspection Pass Rate
Every installation we complete passes city inspection on the first attempt. That's the result of pulling proper permits, sizing equipment correctly, and not cutting corners on refrigerant charge or electrical protection. If an inspector finds something, we fix it at no charge.
Written Labor Warranty
Labor is covered for 3 years and can extend up to 12 years with annual maintenance. Equipment carries the manufacturer's warranty. If something fails within the warranty period, we diagnose and fix it at no charge - no fine print about "installation exclusions.
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 AC Installation
We install air conditioning systems in all kinds of commercial buildings in the Bay Area, including office buildings, stores, apartments, and light commercial buildings. Commercial projects follow the same process: load calculation, proper permitting, licensed installation, and city inspection.
Please get in touch with us directly for business questions about the scope, system configuration, and timeline.
Frequently Asked Questions
How much does AC installation cost in San Jose?
It depends on the system type and your home’s specific needs. A ductless mini-split for a single room or addition typically runs less than a whole-home central AC system. Most installations in the San Jose area start with $5500 for Central-air AC, and $3900 with mini-split systems before any incentives. During the free estimate, we give you a specific number – not a range – based on load calculation, equipment selection, and your existing ductwork and electrical setup.
Is it better to repair or replace my AC?
A common rule of thumb: if the repair cost exceeds 50% of the replacement cost and the system is over 10 years old – replace. If it’s a young system with a single failed component, repair usually makes more sense. We’ll give you both numbers during the diagnostic so you can decide with full information, not sales pressure.
How long does AC installation take?
Most standard central AC installations are completed in one day. Ductless mini-split installations for a single zone take half a day. Projects involving ductwork repairs or electrical panel upgrades may require an additional day – we give you a specific timeline during the estimate before any commitment.
Do I need a permit to replace my AC in San Jose?
Yes, in San Jose and most Santa Clara County cities, AC replacement requires a building permit. We pull all permits before work begins and schedule the city inspection as part of the installation process. Unpermitted installations can void your homeowner’s insurance coverage and create complications when you sell the property.
Do I need to replace my ductwork when installing a new AC?
Not necessarily. We inspect the existing ductwork during the estimate. If ducts are properly sized and sealed, we use them. If they’re leaking, undersized, or poorly designed, which is common in Bay Area homes built before the 1990s, replacing them as part of the installation protects the efficiency gains you’re paying for. Running a high-efficiency AC through leaky ducts wastes 20–30% of its output.
What is SEER, and why does it matter?
SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an AC system converts electricity into cooling over a full season. Higher SEER = lower operating cost. Systems sold in California since 2023 must meet a minimum SEER2 of 14.3. The systems we install range from 16 to 24 SEER2. For a Bay Area home that runs AC 4–5 months per year, the efficiency difference between a 16 and 22 SEER system translates to $150–$300 in annual savings.
What warranty do you provide?
Installation labor is covered for 3 years and can extend up to 12 years with annual maintenance. Equipment is covered by its manufacturer. If something fails within the warranty period, we diagnose and fix it at no charge – no trip fees, no diagnostic charges.
Get a Free Estimate for AC Installation
No trip fee. No diagnostic charge. A licensed technician assesses your home, evaluates your existing system, and gives you a written scope and price, including applicable rebates and incentives.
- go@serviceozone.com
- Serving Bay Area, 24/7
Serving the Greater Bay Area
* and other cities across Santa Clara and San Mateo counties
