510-399-4090

Commercial VRF + Multi-Zone

Commercial VRF Systems Built for Complex Buildings

3rdGen develops, coordinates, installs, and commissions commercial VRF and multi-zone HVAC systems for Bay Area construction, renovation, and modernization projects.

System strategy, equipment selection, refrigerant piping, controls coordination, startup and commissioning

Start a VRF Project 510-399-4090

CA Lic 1086898 • Bay Area commercial, tenant improvements, renovations, new construction. Licensed and insured.

Project Inquiry

Start Project Information

Share project location, timeline, drawings if available, and a short description of the zoning or system requirements. We will review the mechanical scope and follow up.

Multi-Zone Mechanical

Where VRF Makes Sense

VRF is often a fit when a project needs independent zone control, flexible equipment placement, compact distribution, or a mechanical layout that has to work around difficult building conditions.

  • Multi-Zone Buildings

    Independent spaces can be served through a coordinated system architecture while maintaining zone-level control.

  • Architecturally Constrained Projects

    Multiple indoor-unit configurations and compact refrigerant distribution can help solve projects where large duct systems or conventional equipment locations are difficult.

  • Renovations & Tenant Improvements

    VRF can provide a flexible path for projects working within existing structures, ceilings, shafts, and occupied-building constraints.

  • High-Performance New Construction

    VRF can be integrated with ventilation, controls, zoning, and building-performance goals as part of a coordinated mechanical strategy.

System Execution

A VRF System Is Only as Good as the System Around the Equipment

VRF projects combine equipment selection, refrigerant architecture, indoor-unit placement, ventilation, condensate, controls, power, access, and construction sequencing into one connected mechanical system.

3rdGen treats the project as a complete mechanical scope, not a collection of indoor and outdoor units.

Discuss Your VRF Project
Mitsubishi Electric commercial VRF outdoor units on a Bay Area rooftop installation by 3rdGen

System Architecture

Outdoor units, indoor equipment, branch components, piping topology, zoning, and capacity coordinated as one system.

Field Coordination

Refrigerant routing, drains, power, controls, ventilation, structure, ceilings, access, and other trades coordinated around actual project conditions.

Startup & Commissioning

Installation carries through pressure testing, evacuation, startup requirements, controls coordination, verification, and final system turnover.

VRF System Design

Multi-Zone Systems Require More Than Equipment Schedules

The equipment schedule is only one part of the project. The complete system has to work spatially, mechanically, electrically, and operationally inside the building.

Outdoor System

  • System capacity
  • Module configuration
  • Equipment location
  • Service clearances
  • Structural / mounting conditions
  • Acoustic considerations where relevant

Indoor Zones

  • Ducted indoor units
  • Ceiling cassette configurations
  • Wall-mounted units where appropriate
  • Zone requirements
  • Air distribution
  • Access and serviceability

Refrigerant Distribution

  • Main piping routes
  • Branch components
  • Vertical / horizontal routing
  • Pipe lengths and system limitations
  • Insulation
  • Access
  • Pressure testing

Ventilation

  • Outside-air strategy
  • Exhaust
  • ERV / HRV / DOAS coordination where applicable
  • Air balance considerations

Controls

  • Local controls
  • Centralized controls
  • System interfaces
  • Controls contractor coordination
  • BAS interface where applicable

Design to Commissioning

From System Strategy Through Startup

VRF requires continuity between what is selected on paper and what is actually installed in the field. Our process keeps that mechanical scope connected through the project.

  1. 01

    Project Review

    • Plans and project requirements
    • Building conditions
    • Zone requirements
    • Architectural constraints
    • Delivery method

  2. 02

    System Development

    • Equipment strategy
    • Zoning
    • Indoor-unit types
    • Outdoor-system configuration
    • Ventilation / controls approach

  3. 03

    Coordination

    • Refrigerant routing
    • Equipment locations
    • Condensate
    • Electrical requirements
    • Controls
    • Ceiling / structural conditions
    • Trade coordination

  4. 04

    Installation

    • Equipment setting
    • Refrigerant piping
    • Indoor equipment
    • Ductwork where required
    • Condensate
    • Mechanical accessories
    • Controls coordination

  5. 05

    Startup + Closeout

    • Pressure testing
    • Evacuation
    • Manufacturer-required startup procedures
    • Controls verification
    • Commissioning coordination
    • Punch
    • Closeout

Constructability

Designed Around the Building, Not Just the Equipment

VRF can reduce traditional duct distribution, but it creates a different coordination problem. Refrigerant piping, branch components, drains, controls, electrical, ventilation, access, structure, ceilings, and equipment locations still have to coexist inside the building.

  1. Routing

    Plan refrigerant and condensate paths around structure, ceilings, shafts, and other trades.

  2. Access

    Maintain practical access to equipment, branch components, filters, controls, and service points.

  3. Coordination

    Resolve conflicts with electrical, plumbing, architectural, structural, and controls scopes before they become field problems.

  4. Serviceability

    Mechanical equipment still has to be maintained after construction is finished.

Mitsubishi Electric CITY MULTI commercial VRF outdoor modules staged for the Sentinel Building hospitality project by 3rdGen Building Systems.

Project Applications

VRF Across Commercial Project Types

VRF Platforms

Experience Across Commercial VRF Platforms

3rdGen works with established commercial VRF platforms and selects equipment around project requirements, system architecture, availability, controls, and application.

Mitsubishi Electric

Commercial VRF / CITY MULTI systems, ducted and cassette indoor equipment, centralized controls, and project-specific multi-zone applications.

Samsung

Commercial multi-zone / VRF applications with coordinated equipment, piping, controls, and field execution.

Daikin

VRV / multi-zone applications where the platform aligns with project requirements and specifications.

Case Study

Historic Mixed-Use VRF Electrification

View project →
Crane setting commercial VRF outdoor equipment at a Kearny Street, San Francisco hospitality building by 3rdGen Building Systems.
Ceiling cassette VRF indoor unit installation during the Sentinel Building hospitality interior build-out, San Francisco.
Rooftop rigging and mechanical supports for commercial VRF equipment on Kearny Street, San Francisco.
Refrigerant line coordination inside the Sentinel Building hospitality VRF project, San Francisco.
Rooftop equipment pad preparation for hospitality VRF on the Sentinel Building, San Francisco.

North Beach, San Francisco, CA · Design-Build · VRF Electrification Retrofit

Sentinel Building (Columbus Tower)

3rdGen executed a design-build HVAC electrification retrofit in the Sentinel Building—a San Francisco designated landmark converting to boutique hotel use with an active ground-floor restaurant, basement projector suite, server room, and rooftop VRF infrastructure.

Scope spanned hotel guest floors, restaurant and basement conditioning, ventilation, life-safety integration, and six rooftop condensers— all within a 1907 historic structure with no elevator access for equipment and shared vertical risers.

Six outdoor units were crane-set on Kearny Street during an early-morning lane closure. Restaurant changeover work used 3:00 AM windows so the ground floor could stay operational.

System type
Samsung VRF heat recovery + 1:1 heat pump systems
Building type
Historic mixed-use · hotel, restaurant, commercial
Outdoor equipment
Six rooftop condensers (full electrification)
Delivery
Design-build mechanical · SF DBI permit by 3rdGen

Mechanical scope

  • Samsung VRF heat recovery systems on hotel floors with branch controllers and three indoor units per floor (Floors 3–6)
  • Four 5-ton heat recovery condensers and two 5-ton 1:1 heat pump condensers on the roof (restaurant and projector room)
  • Ducted 1:1 systems for the restaurant and basement projector room; dedicated cassette for the server room (Floor 2)
  • Greenheck exhaust, fire and smoke dampers, BACnet controls, and new 200-amp rooftop subpanel for full electrification
  • Title 24 compliance, TAB and acceptance testing, and SF DBI mechanical permit, plans, load calcs, and inspections managed by 3rdGen

Outcome

  • Final inspection passed within two inspection cycles
  • Added scope integrated without disruption; no change orders from scope miscalculation
  • Restaurant and projector suite operational 6+ months with no warranty callbacks

Selected Work

Commercial VRF & Mechanical Projects

Selected 3rdGen commercial mechanical work across the Bay Area.

View all work

Common Questions

Commercial VRF Questions

Installation scope, design paths, ventilation, controls, and existing-building work.

Do you handle complete commercial VRF installations?

Yes. Depending on the project and delivery structure, 3rdGen can support system development, equipment selection, coordination, refrigerant piping, indoor and outdoor equipment installation, controls coordination, startup, and closeout.

Can you work from an engineer's VRF design?

Yes. If the mechanical design is substantially complete, the project can be delivered through our Plan-Spec construction path. We can also participate earlier through Design-Assist when contractor input is useful before the system is fully finalized.

Can you help determine whether VRF is right for the project?

Yes. We can review the building, project requirements, zoning, equipment constraints, distribution, ventilation, controls, and construction conditions to help evaluate the appropriate mechanical approach.

Do you install Mitsubishi commercial VRF systems?

Yes. Mitsubishi is a core equipment platform for 3rdGen, including commercial multi-zone applications where the system is appropriate for the project.

Do VRF systems still require ventilation?

Typically, VRF addresses heating and cooling rather than eliminating building ventilation requirements. Ventilation and exhaust must still be addressed as part of the complete mechanical strategy.

Do you coordinate controls and BAS integration?

Yes. Controls requirements and interfaces can be coordinated with the project's controls contractor, electrical team, and other responsible parties as part of the mechanical scope.

Can you handle VRF projects in existing buildings?

Yes. Renovation and modernization projects are often driven by existing structure, routing, access, electrical capacity, ventilation, and phasing constraints, all of which must be evaluated as part of the project.

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Project Delivery

How We Can Deliver the Project

Project Inquiry

Bring Us Your VRF Project

Have a commercial VRF or multi-zone project in design, bidding, or preconstruction? Send the project information and current documents. We will review the mechanical scope and determine the right next step.

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