Existing Building HVAC

Commercial HVAC Replacement & Modernization

3rdGen handles major commercial HVAC replacement projects for building owners, property teams, and GCs — rooftop equipment, splits, heat pumps, VRF systems, duct modifications, and the mechanical coordination that surrounds a capital upgrade.

Replacement Scope We Carry

Equipment change-outs where procurement, rigging, ductwork, controls interfaces, and startup must be planned as a construction project — not a truck roll.

  • Rooftop unit (RTU) replacement
  • Packaged equipment replacement
  • Commercial split systems
  • Commercial heat pumps and electrification
  • VRF replacement and modernization
  • Duct modifications and air distribution updates
  • Controls-interface and BAS coordination
  • Crane, curb, and adapter coordination
  • Phased work in occupied buildings

How This Buyer Path Works

Capital projects, not service calls

This lane is for major equipment replacement and modernization — not emergency repair or commodity commercial service.

Existing-building constraints

Access, structural loading, electrical service, routing, and shutdown windows are reviewed before equipment is locked in.

Coordination with the project team

Owners, property managers, GCs, and engineers receive clear scope boundaries, schedule impacts, and startup requirements.

Bay Area Mechanical

Planning a Commercial HVAC Replacement?

Send building location, equipment age, timeline, and any existing drawings or photos. We will follow up within one business day to discuss scope and next steps.