Residential · Orinda, CA · 2026
Miner Rd, Orinda: concealed ducted multi-zone heat pump
A Mitsubishi 36k multi-zone heat pump with three ceiling-concealed ducted units, sheet-metal and flex distribution and architectural grilles, built with the general contractor.
On this Orinda project the design called for no visible indoor equipment. We used a Mitsubishi 36k multi-zone heat pump with a branch header and three medium-static ceiling-concealed ducted units (6k, 12k and 15k), each with a filter box and its own control. Air is delivered through sheet-metal and flex ducts to architectural grilles chosen with the general contractor.
- Type
- VRF / Multi-Zone System
- Client
- General contractor-led project
- System
- Mitsubishi 36k multi-zone heat pump with three ceiling-concealed ducted units
- Location
- Orinda, CA · 2026
Scope
- — Mitsubishi 36k multi-zone outdoor heat pump (R-454B) with a 4-port branch header
- — Three medium-static ceiling-concealed ducted units: 6k, 12k and 15k
- — Three FBM2 filter boxes and three remote controls
- — Sheet-metal ductwork and flex distribution
- — Refrigerant line set with pressure testing; VRF-rated ball valves
- — Control wiring and thermostat setup; 30A disconnects
- — Exterior ductwork and enclosure revision
- — Change order: copper fabrication, Invi Air registers and architectural grilles
Constraints
- — Indoor equipment hidden in ceilings
- — Grille and register finishes coordinated with the general contractor
3rdGen's Role
3rdGen designed and installed the concealed multi-zone system and coordinated finishes and revisions with the general contractor.
Outcome
Three zones of heating and cooling with no visible indoor units, only grilles.
Photography
