Furnace Installation in San Jose, CA
Thinking about a new furnace to conquer Bay Area chills? We install high-efficiency units that cut bills and even out heat.
Furnace Installation in San Jose & the Bay Area
If your furnace is over 15 years old, every winter is a gamble — and every therm of gas it burns costs more than it should. Promax installs high-efficiency furnaces across San Jose, from dependable 80% AFUE single-stage units to 96%+ AFUE two-stage and modulating systems that deliver steady, even heat at a whisper. As a Bryant Factory Authorized Dealer, we back installations with full factory warranties and our own labor guarantee.
Every installation starts with correct sizing for your home — not just copying the old nameplate — and includes new venting as required, a code-compliant condensate drain, city permit, and HERS duct testing. Considering going all-electric instead? We'll quote a heat pump conversion side-by-side and check your current rebate eligibility so you can compare with real numbers.
Furnace Installation, Built to Last
Every furnace installation starts with a plan: a system sized to your home, the permits and testing the job requires, and a written quote you can review before you commit. Free in-home estimates on new systems and replacements. If you would rather spread out the cost, financing is available on approved credit.
- Proper load calculation, required permits, and HERS testing on every job
- We check every rebate and incentive you qualify for at your free estimate.
- Your written quote itemizes equipment, labor, permits, and every rebate you qualify for
What's Included With Furnace Installation
Every furnace installation project covers the items below, and the scope and price are confirmed in writing before any work starts. When it's finished the technician walks you through what was done and what to watch for. We call back within one business hour, 7 AM – 10 PM.
- Correct sizing based on a real load calculation
- New venting brought up to current code where required
- Code-compliant condensate drain and combustion-air provisions
- City permit and HERS duct testing
- Full factory warranty registration plus our own labor guarantee
Signs You Need Furnace Installation
These signs usually mean your current system is near the end of its useful life, and each repair tends to buy less time than the last. Holding on too long means rising energy bills, repeated service calls, and the risk of an unexpected breakdown. Call (669) 777-1997 or book online, and we will help you weigh repair against replacement.
- Your furnace is 15+ years old or was recently repaired
- You want higher efficiency to cut winter gas bills
- You're comparing a furnace replacement against an all-electric heat pump
- The current system is too loud, undersized, or heats the home unevenly
Brands We Install
Promax is a Bryant Factory Authorized Dealer, so Bryant equipment is installed by technicians with factory-backed training. We install the other brands shown here as well, and we help you compare them for your home and budget. Every brand here is widely supported, so replacement parts stay easy to find long after the installation.
Need furnace installation help in San Jose?
Related Services
Most furnace installation jobs touch one of these, and the same licensed Promax team handles all of them. Each page lists what's included, typical costs and the questions San Jose homeowners ask most. Not sure which you need? Call (669) 777-1997 and we'll point you to the right one.
Where We Work
Promax Service Group serves homes and businesses in San Jose, across Santa Clara County, and in nearby Peninsula and East Bay cities. Same-day service for no-cool, no-heat and no-hot-water calls, 7 days a week. Choose your city for local details, or call (669) 777-1997 to confirm we cover your address.
Frequently Asked Questions
How much does furnace installation cost in San Jose?
Typical installed prices range from about $5,500 for an 80% AFUE changeout to $9,000–$13,000 for high-efficiency 96% AFUE systems with new venting. Your written estimate itemizes equipment, labor, permit, and HERS testing — no surprises.
What does AFUE mean and what should I buy?
AFUE is the percentage of gas turned into usable heat — an 80% furnace wastes 20¢ of every dollar up the flue; a 96% furnace wastes 4¢. In San Jose's mild-but-real winters, 96% AFUE usually pays back its premium, especially with PG&E gas rates.
Can I replace just the furnace and keep my AC?
Often yes, if the AC is newer and the blower is compatible. If both are past 12–15 years, replacing together (or converting to a single heat pump) saves duplicate labor and usually nets better pricing and any rebate you currently qualify for.
Do I need a new thermostat with a new furnace?
Not always — many smart thermostats are compatible across brands. If your furnace is switching to two-stage or modulating operation, though, a compatible communicating thermostat (like a Bryant Evolution model) unlocks the extra comfort and efficiency the equipment is designed for.
Can you install a furnace in one day?
A like-for-like changeout with existing, code-compliant venting is typically a one-day job. Adding new venting, upsizing gas lines, or converting to a two-stage/modulating system can extend it — your written estimate spells out the timeline before work starts.