HVAC Systems for San Jose Homes: Your Options Explained
Ready for year-round comfort in the Bay Area? From full system design to repair and maintenance, we keep San Jose homes comfortable in every season.
HVAC Systems in San Jose & the Bay Area
A San Jose home has three real HVAC options: a gas furnace paired with a central air conditioner, an all-electric heat pump that heats and cools from one unit, or ductless mini splits for homes without usable ducts. Which one fits depends on your ductwork, electrical panel, how the house holds heat on a 100°F August afternoon, and whether you want to stop burning gas. Picking it is a design decision, not a box swap: the furnace, AC or heat pump, coil, ductwork, venting, and thermostat have to work together as one matched system, sized to your actual home rather than the nameplate on the old equipment. Promax Service Group is a licensed HVAC contractor (Lic #1133885) that designs and installs complete systems across San Jose, Santa Clara, Sunnyvale, Cupertino, and the greater Bay Area: furnace and AC pairs, all-electric heat pump conversions, ductless multi-zone setups, new ductwork, and zoning with smart thermostats. Every project starts with a Manual J load calculation and finishes with HERS testing and a walkthrough of your new controls. Free in-home estimates on new systems and replacements. Looking for repairs or seasonal tune-ups instead? See HVAC Repair and HVAC Maintenance.
As a Mitsubishi Diamond Contractor and Bryant Factory Authorized Dealer, we install equipment we trust and back it with real warranties. Whether you need a high-efficiency heat pump for a Willow Glen bungalow, zoned comfort for a two-story Almaden home, or a rooftop package unit for your business, our EPA-certified technicians size the system correctly, pull the required City of San José permits, and leave your home clean.
HVAC Systems, Done Right
Here is what our HVAC systems work covers: system design and installation, repairs on every major brand, seasonal maintenance, and licensed, EPA-certified technicians on every job. Same-day service for no-cool, no-heat and no-hot-water calls, 7 days a week. Free in-home estimates on new systems and replacements.
- Full-system design, sizing, and installation
- Repairs on every major brand, with parts on the truck for most first visits
- Seasonal maintenance that prevents costly breakdowns
- Licensed, EPA-certified technicians for every job
What's Included With HVAC Systems
Every hvac systems visit 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.
- Manual J load calculation and a written system design
- Mechanical permit and HERS duct-leakage testing
- Removal and eco-friendly disposal of your old equipment
- New refrigerant lines, condensate drain, and code-required safety upgrades
- Manufacturer and Promax labor warranty registration
- Final walkthrough of your new thermostat and controls
Signs You Need HVAC Systems
These symptoms can point to a repair, a tune-up, or a system that has reached the end of its life, and a technician can tell you which. The longer a problem runs, the more it tends to cost in energy, repairs, and comfort. Call (669) 777-1997 or book online, and we will find the cause and explain your options.
- Your system is 12–15+ years old and repairs keep adding up
- Some rooms never reach the temperature you set
- Energy bills have climbed without any change in how you use the system
- The system runs constantly, short-cycles, or won't shut off
- You're adding square footage or converting to an all-electric heat pump
- Rust, burning smells, or unusual noises coming from the equipment
Brands We Service
Promax is a Mitsubishi Diamond Contractor and Bryant Factory Authorized Dealer, so Mitsubishi Electric and Bryant equipment is serviced by technicians with factory-backed training. We service the other brands shown here as well, so one team can look after every system in your home. Our trucks carry common parts for these brands, so many small issues found during a visit can be fixed on the spot.
Need HVAC systems help in San Jose?
Related Services
Most hvac systems 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 a new HVAC system cost in San Jose?
Most full HVAC replacements in the San Jose area run from about $8,000 to $20,000+ depending on system type, home size, and ductwork condition. We provide free, itemized estimates and check every rebate and incentive you qualify for, so the number you approve is the real net cost.
Do I need a permit to replace my HVAC system in San Jose?
Yes — HVAC changeouts in San Jose and Santa Clara County require a mechanical permit and, since 2023, HERS testing. As a licensed contractor, Promax pulls the permit and schedules the inspections for you, so your installation is fully code-compliant.
How long does an HVAC installation take?
A straightforward furnace or AC changeout is usually done in one day. Full system replacements with new ductwork or a furnace-to-heat-pump conversion typically take 2–3 days. We confirm the timeline in your free estimate before any work starts.
Is it better to fix or fully replace an old HVAC system?
As a rule of thumb, if the system is over 12–15 years old and a single repair costs more than a third of a full replacement, replacement is usually the better investment — you stop pouring money into a unit near the end of its life and gain efficiency plus a full warranty. We'll give you both numbers side by side at your free estimate.
Do you offer financing for a full system replacement?
Yes — we offer approved-credit financing with deferred-interest and low-APR terms, so a full HVAC replacement can be paid down monthly. Ask about current financing offers when you book your free estimate.