Furnace Installation & Replacement in San Jose, CA
The Most Efficient Way to Heat and Cool Your Bay Area Home
Furnace installation in the San Jose area typically costs from $4,000 for a gas system and from $3,500 for electric, before incentives. With available state programs, most homeowners may significantly reduce your out-of-pocket cost. Ozone Service handles the complete scope – system selection, load calculation, ductwork assessment, electrical check, permits, installation, and city inspection. One licensed team, one contract, one warranty.
One thing to know before you decide: starting January 1, 2029, the Bay Area Air Quality Management District will no longer allow new gas furnace installations in the Bay Area. If your existing gas furnace needs replacement today, you can still install a new gas system, but it will likely be your last one. We explain what that means for your decision in the system types section below.
Starting January 1, 2029, the BAAQMD will prohibit new gas furnace installations in the Bay Area. If your furnace needs replacement today, gas is still an option – but it will likely be your last one. We give you a direct comparison of gas vs. electric at the free estimate so you can make an informed decision.
What's Included in Every Furnace Installation
Most contractors replace the box and leave. We replace the system, and there’s a difference. Here’s what’s included in every installation, without exception:
Load Calculation
Before we recommend any equipment, we calculate the exact heating load your home requires. An oversized furnace short-cycles – it heats fast, shuts off, and repeats. The result: uneven temperatures, higher wear, and a system that burns out early. An undersized furnace runs constantly and can’t keep up on the coldest nights. Correct sizing is the single most important factor in comfort and longevity, and most Bay Area homes built before 2000 have systems that were never sized correctly to begin with.
Ductwork Assessment
We inspect your existing ductwork for leaks, sizing, and airflow balance before installation. In Bay Area homes, it’s common to find ducts that were installed 30–40 years ago and never updated. Installing a high-efficiency furnace into leaky or undersized ducts eliminates most of the efficiency gains you’re paying for. If ductwork needs to be replaced or modified, we handle it in-house – same team, same contract.
Gas Line and Electrical Check
For gas furnaces, we verify gas line sizing and connections before the install. For electric furnaces and dual-fuel systems, we assess your panel capacity and circuit availability. If an upgrade is needed, our licensed electricians handle it in-house. No subcontractors, no split accountability between trades – a problem that becomes expensive when two separate contractors disagree about whose scope caused a failure.
Permits and City Inspection
Every furnace installation requires a permit. We pull all permits through the city or county building department before work begins. After installation, we schedule and pass city inspection – our pass rate across San Jose and the Peninsula is 100%. An unpermitted installation voids your warranty, can create problems when you sell the home, and leaves you with no recourse if something fails.
System Commissioning
After installation, we verify gas pressure (for gas units), airflow across all registers, thermostat calibration, and system operation before we close out the job. This step is where most installation shortcuts show up – incorrect gas pressure, restricted airflow, and thermostats wired out of sequence. We walk you through the filter replacement schedule and thermostat operation before we leave.
Up to 12-Year Parts and Labor Warranty
Parts and labor, in writing. If something fails within the warranty period, we diagnose and fix it at no charge – no trip fee, no diagnostic charge, and no labor costs. The warranty covers both the equipment and the installation work.
Which Furnace System Is Right for Your Home?
The answer depends on three things: what fuel infrastructure you have, whether you’re planning this as a long-term upgrade or a like-for-like replacement, and what the 2029 gas regulations mean for your situation. Here’s what you need to know.
Gas Furnace
Most Common
$4,000+
Best for homes with existing gas service. Fastest heat output. Lower operating cost than electric resistance. Most Bay Area furnaces installed are gas.
After Jan. 1, 2029: gas furnace installations will no longer be permitted in the Bay Area.
As a part of a heat pump system
No Gas Line Required
$3,500+
Best for homes without gas lines, all-electric setups, or homes where adding a gas connection is not practical. Lower install cost; higher monthly operating cost.
Fully compliant with 2029 regulations. Qualifies for local and state rebate programs.
Panel Upgrade
Maximum Flexibility
$9,000+
A heat pump handles heating and cooling at high efficiency. A gas furnace serves as backup when temperatures drop below the heat pump efficiency range. Best long-term efficiency in Bay Area climate.
Heat pump component is fully electric and 2029-compliant. Gas components can remain operational on existing infrastructure.
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.
This Service May Cost Less Than You Think
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 Final Inspection
Here’s exactly what happens when you work with us, from the first conversation to the city sign-off.
Step 1
Free Estimate and System Assessment
We visit your home at no charge. During the visit, we assess your existing heating system, measure the space, evaluate your ductwork condition, and check your electrical panel. We perform a load calculation to determine the correct system size for your home’s actual heating demand – not a guess based on the previous unit’s BTU rating.
At the end of the visit, you receive a written scope and price. No verbal estimates, no ranges – a specific number for the specific job.
Step 2
System Selection
We recommend the right furnace based on your load calculation, existing infrastructure, and your goals. We’ll walk you through your options – system type, efficiency rating, and brand – and explain the trade-offs clearly. We work with Goodman, Carrier, Lennox, Trane, Daikin, and Rheem.
If your project involves the gas ban decision – whether to install gas now or switch to electric – we give you a direct comparison of installed cost, operating cost, and incentive eligibility so you can make an informed choice.
Step 3
Permits
We pull all required permits through the city or county building department before work begins. In San Jose and across Santa Clara County, furnace installations require a building permit and a final city inspection. We handle the permit application, coordinate with the inspector, and schedule the inspection as part of our standard process.
An unpermitted installation is not covered under manufacturer warranty and creates disclosure obligations when you sell your home.
Step 4
Installation
Most furnace installations are completed in one day. Projects that include ductwork modification, electrical panel work, or gas line changes may take two days – we give you a specific timeline at the estimate, before any commitment.
Our in-house team handles HVAC and electrical under one contract. If an electrical upgrade is needed as part of your furnace installation, it’s included in the same scope – not subcontracted out.
Step 5
City Inspection and Commissioning
We schedule city inspection and pass it before the job is closed out. Our inspection pass rate across San Jose and the Peninsula is 100% – the result of pulling proper permits, sizing equipment correctly, and not cutting corners on connections.
After inspection, we commission the system: verify gas pressure (for gas units), check airflow across all registers, calibrate the thermostat, and confirm full system operation. We walk you through filter replacement schedule and basic maintenance before we leave.
Why Bay Area Homeowners Choose Ozone Service for Furnace Installation
HVAC and Electrical Under One Roof
Furnace installation almost always involves electrical work. At minimum, a furnace needs a dedicated circuit, a disconnect box, and proper grounding. Gas furnaces require a 120V circuit for controls and the blower motor. Electric furnaces draw significantly more - often 60–100 amps on a dedicated breaker. Dual-fuel systems involve both. When two separate contractors handle HVAC and electrical, accountability disappears the moment something goes wrong. Each trade points to the other. We carry both HVAC and electrical licenses. One team handles the full scope - gas, electrical, and ductwork - under one contract and one warranty. If something fails, there's no question about who fixes it.
Correct Sizing - Not a Like-for-Like Swap
Most furnace replacements go like this: the old unit comes out, the new one goes in the same spot, same BTU rating, and job done. The problem is that the original furnace may have been oversized from the beginning - common in Bay Area homes where contractors routinely overspecified equipment. Or your home has had insulation added, windows replaced, or an addition built since the original install. We perform a full load calculation on every installation. If the correct size is different from what you had before, we'll explain exactly why and show you the math.
100% City Inspection Pass Rate
Every installation we complete passes city inspection on the first attempt. That's not a marketing claim - it's a trackable outcome. The reasons: we pull proper permits before starting, we size equipment correctly, and we don't skip refrigerant charge verification, gas pressure testing, or electrical protection checks. Inspectors reject installations that take shortcuts. We don't take shortcuts.
We Handle the Incentive Paperwork
Rebate requires that the installation meet specific efficiency standards, use qualifying equipment, and be documented correctly. Most HVAC contractors don't know the requirements well enough to ensure the installation qualifies, and they leave the paperwork to the homeowner. We’ve secured more than $350,000 in rebates for Bay Area homeowners over the last 6 months because we built compliance into the installation from day one. The documentation gets handled. You get the credit.
Recent Project
Menlo Park Issue: High level of Carbon Monoxide (CO) detected during inspection, indicating a cracked/burned-out heat exchanger. Additionally, the AC systems were found to be low on refrigerant. Solution: To ensure safety and restore climate control, our team performed a complete replacement of both old furnaces and AC units, addressing all hazardous and performance issues. Result: Eliminated CO hazard completely. The new energy-efficient heating and cooling systems are operating flawlessly and safely.
What You Get
Common AC Repairs We Handle in San Jose
Refrigerant pressure check
Low refrigerant doesn’t just reduce cooling – it strains the compressor until it fails. We locate the leak, repair it, and recharge the system to manufacturer spec. Adding refrigerant without fixing the source is a temporary patch that accelerates damage. Our EPA 608-certified technicians handle all refrigerant work in compliance with California regulations.
Evaporator and condenser coil cleaning
Dirty coils reduce efficiency by up to 30% and cause the system to run longer and hotter
Electrical components (capacitors, contactors, wiring)
These degrade before they fail so catching them early costs a fraction of emergency repai
Condensate drain flush
Prevents water damage and mold buildup common in Bay Area summer humidity
Airflow and filter assessment
Restricted airflow is the single most common cause of early system failure
Thermostat calibration check
A 2°F error makes the system run longer than it needs to, wasting energy and causing wear.
Full system performance report
Written findings with recommendations. You keep the report with no commitment required
Authorized Dealer & Installer
Real Repairs, Real Results
What Our Customers Say
Commercial Furnace Installation and Replacement
We install and replace furnaces and heating systems for commercial properties across the Bay Area – office buildings, retail spaces, multi-unit residential, warehouses, and light industrial. Commercial projects follow the same process: load calculation for the space, proper permitting through the relevant jurisdiction, licensed installation, and city inspection.
Commercial heating systems have different load profiles, ventilation requirements, and code obligations than residential. If your project involves rooftop package units, larger-capacity forced air systems, or zoned commercial heating, contact us directly to discuss scope and timeline.
Frequently Asked Questions
Should I repair or replace my furnace?
The standard guideline: if the repair cost exceeds 50% of the cost of a new system, or if your furnace is more than 15 years old and requires a major repair, replacement is typically the better financial decision. A furnace that’s 20+ years old and still running isn’t necessarily safe – heat exchangers crack, gas connections degrade, and safety controls fail without obvious symptoms.
We give you a clear comparison in the estimate: specific repair cost vs. replacement cost, accounting for the furnace’s remaining expected lifespan and current operating efficiency. You make the call with real numbers, not pressure.
Can I still install a gas furnace in San Jose?
Yes, until January 1, 2029. After that date, the Bay Area Air Quality Management District prohibits new gas furnace installations in the nine-county Bay Area. Your existing gas furnace can remain in service indefinitely; the rule applies only to new installations.
If your current gas furnace needs replacement now and you want another gas system, we can install it. If you’re considering making the switch to electric (heat pump or electric furnace), we walk you through the cost comparison and available incentives at the free estimate.
How much does furnace installation cost in San Jose?
Gas furnaces: from $4,000 installed, before incentives. Electric furnaces and heat pump systems: from $3,500 for an electric furnace and from $7,000 for a heat pump system (heating + cooling), before incentives. Local and state incentive programs may significantly reduce your cost — we calculate exact eligibility at the free estimate.
How long does furnace installation take?
Most furnace installations are completed in one day. Projects that include ductwork modification, electrical panel work, or gas line changes typically take two days. We provide a specific timeline in the estimate before any commitment so you can plan accordingly.
What is AFUE, and does it matter for Bay Area homes?
AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts fuel to heat. A 96% AFUE gas furnace converts 96 cents of every dollar in gas to usable heat. The Bay Area’s mild winters mean furnaces run fewer hours per year than in colder climates, so the payback period on a high-efficiency upgrade is longer than in, say, Chicago.
That said, AFUE still matters if you’re planning to stay in the home for 5+ years or if you’re switching from an older 80% AFUE system to a 95%+ model. We calculate the actual payback for your specific situation during the estimate.
Do I need to replace my ductwork?
Not always. We inspect the existing ductwork during the estimate. If ducts are properly sized and sealed, we connect the new furnace to them. If they’re undersized, leaking, or poorly designed – common in Bay Area homes built before 2000 – we recommend replacement.
Installing a high-efficiency furnace into leaky ducts wastes a significant portion of the efficiency gains you paid for. The furnace heats; the ducts lose it before it reaches the rooms.
Will my electrical panel need to be upgraded?
For gas furnaces: possibly. Gas furnaces still require a 120V circuit for the blower motor and controls. Most panels handle this without upgrades. For electric furnaces: likely. Electric furnaces draw 60–100 amps on a dedicated circuit – older panels may not have the capacity.
We assess your panel as part of the free estimate. If an upgrade is needed, our licensed electricians handle it in-house under the same contract and warranty.
What warranty do you provide?
Up to 12 years on parts and labor. That covers both the equipment and the installation. If something fails within the warranty period, we diagnose and fix it at no charge – no trip fee, no diagnostic fee, no labor costs. The warranty is provided in writing at the time of installation.
Get a Free Estimate for Furnace Installation
No trip fee. No diagnostic charge. A licensed technician visits your home, calculates the correct system size, and gives you a written scope and price, including which incentive programs apply to your project.
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