Eichlers without ducts. ADUs without HVAC. That one room that runs 10 degrees hot every afternoon. Ductless mini-splits solve the problems central systems cannot, with per-room temperature control and quiet inverter operation.
Onzone installs single-zone and multi-zone mini-splits across the Bay Area. We work with every major brand: Mitsubishi, Daikin, LG, Fujitsu. We do single rooms, whole homes, and additions.
Your Eichler, ADU, garage conversion, or addition needs heating and cooling without opening walls for new ducts.
Bedrooms, offices, or bonus rooms stay hot or cold because the existing central system cannot serve them properly.
New backyard units need correctly sized single-zone or multi-zone mini-splits for year-round comfort and code-ready installation.
New living space needs its own indoor head or zone instead of overloading the main HVAC system.
Wrong placement makes the head ineffective: cold dumping on a sofa, hot air bouncing back, sight lines blocked. We walk the room, model the airflow, and put the head where it actually performs.
Single-zone installs in a day. Two to four zones across a day and a half. We minimize wall penetrations and route line sets cleanly so the install looks intentional, not patched in.
If you have a Bay Area Eichler, mid-century home with no AC, or a finished attic that never gets the temp the rest of the house gets, mini-splits are usually the right answer. We tell you when ducted central AC is the better path.
Single-zone (one indoor head) installs typically run $5,500 to $9,000 depending on equipment and access. Multi-zone systems (2 to 5 indoor heads) run $9,000 to $22,000. We write line-item proposals so you see equipment cost separate from labor.
Mitsubishi, Daikin, LG, Fujitsu, Carrier, and Mr. Cool. Mitsubishi and Daikin are our most-installed brands for Bay Area homes because of cold-climate performance and parts availability.
Yes. Eichlers and other mid-century Bay Area homes without existing ducts are the classic mini-split use case. We have installed them in Mohr-Martin, Vintage Hills, the Dublin Camp Parks builds, and Eichler tracts across the East Bay.
Indoor heads at low fan: about 22 to 28 dB, quieter than a refrigerator. Outdoor compressors are slightly louder than a window unit but much quieter than a traditional condenser.
Heat-pump mini-splits (which are most of them) qualify for the same BayREN, PG&E, and BAAQMD programs as ducted heat pumps. See the heat pump installation page for the rebate map.
