North Beach, San Francisco, CA · VRF / Multi-Zone System
3rdGen Building Systems
Commercial Mechanical Construction & HVAC Systems
Plan-spec mechanical construction, commercial HVAC replacement, VRF systems, tenant improvements and multifamily projects throughout the Bay Area.
CA Lic 1086898 • Bay Area commercial mechanical contractor • Licensed & insured
3rdGen Building Systems
Commercial Mechanical Construction & HVAC Systems
Plan-spec mechanical construction, commercial HVAC replacement, VRF systems, tenant improvements and multifamily projects throughout the Bay Area.
CA Lic 1086898 • Bay Area commercial mechanical contractor • Licensed & insured
Project Inquiry
Inquiry Sent
Thanks — your project details are on their way to 3rdGen. We’ll review them and follow up about the next step.
Two Ways We Work
Project Construction or Existing-Building Upgrades
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Have plans or a project underway?
For general contractors, design teams, developers, and owners on active construction.
Plan-spec mechanical scopes from bid and submittals through closeout.
Mechanical Construction -
Replacing or modernizing existing HVAC?
For owners, property teams, and contractors managing major equipment replacement or modernization.
RTUs • Packaged Equipment • Heat Pumps • VRF Replacement • Major System Upgrades
HVAC Replacement & Modernization
Commercial Specialty
Commercial VRF & Multi-Zone Systems
3rdGen installs and coordinates commercial VRF systems for engineered construction projects, existing-building upgrades, and replacement applications.
Mitsubishi • Samsung • Daikin
Experience spans plan-spec VRF bids, refrigerant piping, controls integration, startup, and replacement/modernization in occupied buildings — only where project history supports the claim.
New / plan-spec projects
Engineered VRF scopes where 3rdGen bids, coordinates, installs, starts up, and closes out the system.
Existing buildings
VRF replacement, modernization, additions, phased upgrades, and system changes when equipment reaches end of life.
Field coordination
Equipment, branch controllers, refrigerant routing, controls interfaces, and manufacturer coordination through startup.
Project types
Mechanical Scopes We Execute
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Mechanical Construction
Plan-spec mechanical scopes from bid through closeout.
Mechanical Construction -
Tenant Improvements
Mechanical work for commercial renovations and buildouts.
Tenant Improvement HVAC -
Multifamily HVAC
Apartment and mixed-use mechanical — VRF, heat pumps, ventilation, and distribution.
Multifamily HVAC -
HVAC Replacement & Modernization
RTUs, packaged equipment, heat pumps, VRF replacement, and major upgrades.
Replacement & Modernization -
Controls-Ready Mechanical
Mechanical installed and coordinated for specified BAS / BACnet architecture.
Controls-Ready Mechanical -
VRF & Multi-Zone Systems
Commercial VRF construction, replacement, coordination, and startup.
Explore VRF Systems
Execution scope
Mechanical Scope From Preconstruction Through Closeout
Commercial buyers need to see that 3rdGen understands the full project lifecycle — not just equipment setting.
- Estimating / Scope Review
- Submittals
- RFIs
- Procurement
- Coordination
- Ductwork
- Refrigerant Piping
- Equipment Setting
- Controls Coordination
- Startup
- TAB / Commissioning Coordination
- Punch
- Closeout
Sheet Metal & Ductwork
Project-specific sheet-metal fabrication is performed in-house where appropriate. Larger ductwork packages are coordinated through established fabrication partners as part of our mechanical contracts.
- Plenums, transitions, and fittings
- Equipment connections
- Duct modifications in existing buildings
- Larger project duct packages
Delivery models
How 3rdGen Fits Your Project Structure
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Plan-Spec
Engineer-of-record provides the mechanical design. 3rdGen prices and executes the approved mechanical scope. This is our strongest, most proven commercial lane.
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Design-Assist
3rdGen supports equipment selection, constructability, coordination, installation strategy, and cost feedback during project development while the engineer retains design responsibility.
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Design-Build
When appropriate, 3rdGen coordinates qualified, licensed mechanical engineering partners as required for design and construction — not an in-house engineering department.
Project Teams
Built to Work With the Project Team
Shared audience pages explain how 3rdGen supports each role — from scope review and submittals through installation and closeout.
- General contractors & estimators
- Architects & design teams
- Mechanical engineers of record
Each audience page explains how we support that role — from scope review through field execution.
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01 For General Contractors
Preconstruction, bidding, submittals, RFIs, coordination, installation, schedule, punch, and closeout.
Mechanical scope that stays aligned with the GC schedule — from plan-spec bids through field execution.
Mechanical Support for GCs -
02 For Architects
Early mechanical input, constructability, equipment coordination, and architectural integration.
Practical mechanical feedback before routing, access, and visible components are locked in by field conditions.
Coordination for Architects -
03 For Engineers
Execution of engineered designs through startup, TAB/commissioning support, and closeout.
Submittals, RFIs, field coordination, and controls-ready installation aligned with the engineer’s design intent.
Working With Engineers
Commercial work
Commercial Projects & Mechanical Execution
FAQ
Commercial HVAC Questions
Straight answers about plan-spec work, VRF, replacement, and how to start a project review.
What types of commercial HVAC projects do you take on?
Plan-spec mechanical construction, VRF systems, tenant improvements, multifamily, major equipment replacements, and existing-building HVAC modernization.
Do you work from engineered mechanical plans and specifications?
Yes. Plan-spec work is a core commercial delivery path. 3rdGen can handle estimating, submittals, RFIs, coordination, installation, startup, and closeout from the approved design.
Do you provide commercial HVAC design-build services?
Yes, when the project calls for it. 3rdGen can support design-assist and coordinate licensed mechanical engineering partners as required — not an in-house engineering department on every project.
Do you install and replace commercial VRF systems?
Yes. 3rdGen works with commercial VRF and multi-zone systems for new construction, renovations, replacements, and system upgrades, including Mitsubishi, Samsung, and Daikin equipment where appropriate.
Do you replace rooftop units and other commercial equipment?
Yes. 3rdGen handles major commercial HVAC replacement projects including RTUs, packaged equipment, split systems, heat pumps, VRF equipment, duct modifications, and related coordination.
Can you handle ductwork and custom sheet-metal work?
3rdGen performs project-specific sheet-metal fabrication in-house where appropriate and coordinates larger fabrication packages through established partners as part of our mechanical contracts.
How do we get a commercial project reviewed or priced?
Send the project plans, specifications, equipment schedules, scope information, and any relevant existing-condition documentation. 3rdGen will review the project and determine the appropriate next step.
Project Inquiry
Inquiry Sent
Thanks — your project details are on their way to 3rdGen. We’ll review them and follow up about the next step.