Ductless Mini Split Systems in San Jose, CA
Efficient, quiet cooling and heating without ripping out walls — ideal for additions, older homes, and room-by-room comfort.
Ductless Split Systems in San Jose & the Bay Area
No ducts? No problem. Ductless mini split systems deliver whisper-quiet heating and cooling to any room — perfect for San Jose's older Willow Glen and Naglee Park homes, garage conversions, ADUs, home offices, and additions where extending ductwork isn't practical. One outdoor unit can serve up to eight indoor zones, each with its own remote and temperature.
Promax is a Mitsubishi Diamond Contractor — the highest tier of factory training and warranty backing Mitsubishi offers — and we also install Daikin, Bryant, and Cooper & Hunter ductless systems. Installation is clean and fast: most single-zone mini splits are running the same day, with only a 3-inch line-set opening in the wall.
Ductless Split Systems, Done Right
Here is what our ductless split 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 Ductless Split Systems
Every ductless split 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.
- Load calculation sized per room or zone, not guessed
- Line-set routing through a single ~3-inch wall penetration per indoor head
- Mitsubishi, Daikin, or Cooper & Hunter equipment matched to your space
- Condensate drain routed to a safe termination point
- Wall-mount, ceiling cassette, or floor-console head styles
- Wi-Fi control setup and a walkthrough of the remote/app
Signs You Need Ductless Split 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.
- A room addition, garage conversion, or ADU has no ductwork
- One bedroom or home office is always too hot or too cold
- You want zone-by-zone control instead of one house-wide thermostat
- Extending existing ductwork isn't practical or would be very costly
- You want quiet, efficient heating and cooling without a furnace
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 ductless split systems help in San Jose?
Related Services
Most ductless split 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 mini split installation cost in San Jose?
Single-zone installations typically run $4,500–$8,000 installed; multi-zone systems $12,000–$25,000+ depending on zones and line-set runs. These are rebate-sensitive numbers: TECH Clean California funding is exhausted and the federal 25C tax credit ended for installations after December 31, 2025, so we quote you the real, current cost and flag any rebate you do qualify for at the free estimate.
Do mini splits heat as well as they cool?
Yes — every system we install is a heat pump that both heats and cools. Mitsubishi hyper-heat models keep full heating output far below any temperature San Jose ever sees, so one system covers you year-round.
Single-zone or multi-zone — which do I need?
Single-zone is ideal for one problem room (a garage office, an ADU, a hot upstairs bedroom). Multi-zone makes sense when you're conditioning three or more rooms — one outdoor unit, individual control in each room. We'll design both options in a free in-home assessment.
How long does mini split installation take?
A single-zone system is typically installed and running the same day — usually 4–8 hours from mounting the indoor head to commissioning the outdoor unit. Multi-zone systems with longer line-set runs can take an extra day or two.
How loud is a ductless mini split?
Indoor heads run around 19–30 dB — quieter than a whisper — and outdoor condensers run 50–60 dB, comparable to a central AC's outdoor unit but often quieter thanks to inverter-driven variable speed.