Residential · Berkeley, CA · 2026
Grizzly Peak Blvd, Berkeley: ductless ceiling cassettes for a hillside home
Two Mitsubishi one-way ceiling cassettes on a 24k multi-zone heat pump for the living room and primary bedroom of a Berkeley hills home, with lines run through the attic.
The owners of this Grizzly Peak home wanted cooling and efficient heat in the living room and primary bedroom without wall-mounted units. We installed two Mitsubishi one-way ceiling cassettes on a 24k multi-zone outdoor unit and ran the refrigerant, condensate and control wiring through the attic. The existing gas furnace stays in place for the rest of the house.
- Type
- VRF / Multi-Zone System
- Client
- Residential homeowner
- System
- Mitsubishi 24k multi-zone heat pump with two ceiling cassettes
- Location
- Berkeley, CA · 2026
Scope
- — Mitsubishi MXZ-3D24NL multi-zone outdoor unit (R-454B) set on the existing slab, raised on threaded rod
- — MLZ-KX18NL 18k one-way ceiling cassette in the living room
- — MLZ-KX09NL 9k one-way ceiling cassette in the primary bedroom, cut in between ceiling joists
- — About 20 ft of vertical exterior line-hide up to the attic
- — Refrigerant, condensate and communication wiring routed through the attic
- — Dedicated 30A/240V circuit and fused disconnect by our licensed electrical subcontractor
- — Pressure test, evacuation, startup and commissioning of both zones, Wi-Fi setup and owner walkthrough
Constraints
- — Occupied home: floor protection and daily cleanup
- — Attic access and framing limited where the cassettes could go
- — Existing gas furnace kept in service for the rest of the house
3rdGen's Role
3rdGen laid out the two zones, filed the City of Berkeley permit with Title 24 (CF1R) energy compliance, installed and commissioned the system. City of Berkeley electrical/mechanical permit with CF1R energy compliance; inspections passed.
Outcome
The two most-used rooms now have quiet, flush-mounted heat pump heating and cooling. The permit inspections were passed.
Photography
