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Replacing big, costly office rooftop units with multi-zone mini-splits and VRF.

Many Southern California office buildings still run on a few large rooftop units or an aging central system. When one fails, the repair is large, the downtime is wide, and every tenant shares the same comfort problem. Converting to multi-zone ductless or VRF replaces that single point of failure with many small ones and gives each zone its own control.

Request a conversion assessment (714) 594-9194

Conversion is not always the right answer. These guides cover when it is, when a like-for-like replacement is better, what the electrical and structural questions are, how an occupied floor gets phased, and what the maintenance picture looks like afterward.

The work is performed by our own refrigeration and controls crew from design coordination through startup, with no subcontracted trades, so there is one team accountable for piping, charging, controls and commissioning.

Decide

Replacing office rooftop units with multi-zone VRFWhat a rooftop-to-VRF conversion replaces, how zoning and redundancy change, the real advantages and drawbacks, and what an office building must offer.Convert or replace in kind: office HVAC decision guideA decision framework for offices weighing conversion against like-for-like replacement, covering age, refrigerant, ducts, layout, power, roof and leases.VRF vs multi-zone ductless vs rooftop units for officesCompare VRF, multi-zone ductless and rooftop units for office buildings by size, ceiling type, load diversity, heat recovery, controls and maintenance access.

Design and build

Office HVAC conversion: electrical, structural, pipingWhat an office conversion to VRF or multi-zone ductless demands from power, roof, risers, refrigerant piping, A2L safety and condensate, and who owns each.Phasing an HVAC conversion in an occupied officeHow to sequence a rooftop-to-VRF or multi-zone conversion while tenants stay in the building: floors, suites, noise, dust, temporary cooling and crane days.Title 24, permits and incentives for office conversionsWhat Title 24 usually asks of an office HVAC alteration, how permits and plan check run, what acceptance testing involves, and how to treat incentives.

Operate

Zoning and controls after an office conversionHow to set up tenant thermostats, schedules, central controllers and BAS links after an office moves to VRF or multi-zone, and the usual pitfalls.Maintaining VRF and multi-zone systems in officesMaintenance outline for office VRF and multi-zone systems: indoor filters and coils, condensate pumps, outdoor coils, leak detection and controller faults.

By region

Office HVAC conversion in Orange CountyWhere rooftop-to-VRF and multi-zone office conversions make sense in Orange County, from Irvine to Anaheim, and how a home-base crew runs them.Office HVAC conversion in Los Angeles CountyHow office HVAC conversion differs across Los Angeles County, from Westside low-rises to Valley campuses, and which buildings are worth converting.Office HVAC conversion in the Inland EmpireOffice and flex-office HVAC conversion in Riverside and San Bernardino Counties, where summer heat decides equipment choice and how the system is sized.Office HVAC conversion in San Diego CountyOffice HVAC conversion in San Diego County: coastal corrosion, R&D and flex space, SDG&E, and which buildings are good candidates for VRF.Office HVAC conversion in Ventura CountyA practical look at converting office HVAC in Ventura County, from Oxnard and Ventura to Camarillo and Thousand Oaks, and who the work suits.

Performed by our own crew. No subcontractors.

The mechanical, refrigeration and controls work on our projects is done by our own UA Local 250 workforce. The people who price the job are the people who set the equipment, pipe it, charge it and start it up, so one team answers for every task in the scope. Rented equipment such as a crane truck is coordinated by us.

How self-performed work works

Common questions

Why convert an office from rooftop units to multi-zone mini-splits or VRF?
Zoning, redundancy and control. A failed rooftop unit takes out a whole area, while a failed indoor head or one outdoor module affects far less. Individual zone control also lets tenants set their own comfort and lets the owner see usage by space.
Is conversion always cheaper to operate?
Not automatically. Savings depend on the existing equipment, the building envelope, the occupancy pattern and the controls strategy. We describe the factors to evaluate in the decision guides and recommend a site assessment before anyone commits.
Can an occupied office stay open during conversion?
Usually yes, with phasing by floor or suite, after-hours work for noisy or disruptive tasks, and temporary measures where needed. The phasing guide covers how that is planned.
Do you do the whole conversion with your own crew?
Yes. Piping, refrigerant work, equipment setting, controls and startup are performed by our own UA Local 250 workforce. Rented rigging equipment is coordinated by us. See self-performed work.

Thinking about converting a building?

Send us the building address and the current equipment list. We will walk the roof and the mechanical spaces and tell you whether conversion or in-kind replacement fits.

Request a conversion assessment