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The three clearest documented facilities that successfully implemented variable refrigerant flow (VRF) are Columbia Square in Hollywood, the People’s Petroleum Building in Tyler, and Detroit’s David Whitney Building. Each used VRF to solve a different retrofit problem: phased tenant customization, floor-by-floor replacement in an occupied building, or mechanical work inside thick historic masonry. The projects show where VRF can be a practical alternative to large new duct systems, but they are case studies rather than a controlled comparison. Their published savings figures are estimates or manufacturer-reported results, and no common, independently measured operating dataset exists for all three.
What do these three VRF projects have in common?
VRF (variable refrigerant flow) uses refrigerant piping connected to multiple indoor units and one or more outdoor units. The system can divide a building into many zones, allowing different rooms or tenants to receive separately controlled heating or cooling. Depending on the design, heat-pump or heat-recovery equipment can serve those zones, while indoor units may be concealed, ducted, cassette-style, or wall-mounted.
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That flexibility matters in older buildings because the main obstacle is often not the refrigeration cycle itself. It is how to route new services through a structure that has historic finishes, limited ceiling space, existing tenants, or a constantly changing floor plan. VRF does not remove the need for ventilation, electrical capacity, condensate drainage, controls, commissioning, and maintenance planning. It can, however, reduce the amount of large new ductwork and allow installation to be staged.
| Facility | Retrofit problem | Documented VRF response | Evidence and qualification |
|---|---|---|---|
| Columbia Square, Hollywood | Historic glazed complex with office, retail, restaurant, and residential uses and changing tenant layouts | Core-and-shell outdoor units and refrigerant piping first; heat-recovery boxes and tenant-selected indoor units later | 1,244-ton system with 44 Multi V IV outdoor units, according to the LG project profile; LEED Gold applied to the renovation, not solely to HVAC |
| People’s Petroleum Building, Tyler | Replacement of a 1960s chilled-water system while floors remained leased | Air-cooled heat-pump VRF/VRV installed one floor at a time over several years | Buildings reported estimated energy and maintenance savings in 2017; those figures were not presented as independently verified current results |
| David Whitney Building, Detroit | 19-story historic structure with thick marble and limestone walls and varied hotel, residential, and hospitality spaces | Small refrigerant penetrations, multiple indoor-unit styles, and outdoor units distributed among roof, alley, and basement-level locations | Mitsubishi Electric reported $1.8 million saved; that is a manufacturer case-study figure, not an independently audited attribution |
Prices checked November 2026.
1. How did Columbia Square use VRF for phased tenant build-outs?
Columbia Square is a 4.7-acre former CBS complex in Hollywood that was redeveloped as a mixed-use site. The project had to preserve the character of a historic campus and its extensive glass while supporting offices, retail, restaurants, and residences. A single tenant-ready mechanical arrangement would not have been enough: each space could be configured differently, and some areas would be completed or leased later than others.
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The original concept considered water-source heat pumps and packaged rooftop units. The project team selected an LG VRF approach because it could provide the required efficiency and flexibility while fitting the redevelopment strategy. LG’s Columbia Square project profile describes a phased core-and-shell installation. Outdoor units and refrigerant piping were installed first. Heat-recovery boxes and the indoor units selected for each tenant were added as the spaces were configured.
That sequence changes the financial and scheduling profile of a retrofit. The owner can establish the central distribution infrastructure before every tenant’s final partition plan, then avoid tearing out a complete system when a later occupant wants a different arrangement. It also supports mixed-use zoning: restaurants, offices, residences, and retail typically have different schedules, internal loads, and comfort expectations.
The published system size is 1,244 tons served by 44 Multi V IV outdoor units. Those are figures from LG’s project documentation, whose profile is undated. The renovation is identified as LEED Gold; the certification should not be read as proof that the VRF system alone caused the rating.
Scott Gilchrist, LG’s regional sales manager for the Pacific Region, explained the preservation benefit this way: “Using VRF and its high energy efficiency allowed them to keep many of the existing glass windows to maintain that certification.” The statement links the equipment choice to the design team’s ability to retain glazing, but it is not an independently measured energy result. The profile also quotes Richard Mount, senior vice president of construction services at Kilroy Realty Corporation, saying, “LG became a partner and really helped us with our air conditioning solution.”
What this case demonstrates: VRF can be installed as a backbone for a shell and then completed with tenant-specific indoor units. The value is less about a universal equipment arrangement than about preserving optionality while a mixed-use project is still being leased and fitted out.
2. Can VRF be installed floor by floor in an occupied building?
Yes. The People’s Petroleum Building in Tyler, Texas, is the clearest example in the available data of a staged replacement strategy. The 15-story, 85,000-square-foot building still had tenants while its chilled-water air-conditioning system, dating from the 1960s, needed replacement. Instead of shutting down the entire building for one major installation, the owner could purchase and install the new system one floor at a time.
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Tom Monick, a partner at Mechanical Concepts, described the approach in the Buildings case report: “One of the most important benefits of VRF for the People’s Petroleum Building was their ability to complete the renovation of the air conditioning system on a floor-by-floor basis, as the building was being leased. The air conditioning was actually purchased and installed over a few years.”
ACHR News identifies the equipment as Daikin VRV. The configuration used air-cooled heat pumps with heat-recovery components. Most indoor units were ceiling-mounted cassettes, with wall-mounted units in some areas. That mix illustrates why a VRF design must follow the ceiling geometry, partition plan, and tenant requirements on each floor rather than assume that one indoor-unit type will suit the whole building.
Floor-by-floor work can reduce disruption, but it requires careful boundaries between completed and unfinished areas. Designers and contractors need a sequence for risers, branch piping, electrical feeders, controls, condensate drainage, and temporary protection. A phased plan also has to preserve access for future floors and allow the operating floors to remain safe and comfortable while construction proceeds elsewhere. VRF makes that sequence possible; it does not eliminate the coordination work.
The 2017 Buildings article reported project expectations of 20 to 30 percent energy savings and a 50 percent reduction in maintenance costs. Those numbers are estimates or expected outcomes reported at the time, not a current, independently measured result. They should therefore be used as the project team’s business case, not as a guaranteed performance level for every VRF retrofit.
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What this case demonstrates: Owners do not always have to wait for a full-building shutdown or fund a single replacement event. A floor-by-floor VRF program can align capital spending with lease turnover and keep more of the building in service, provided the distribution and controls are designed for incremental expansion.
3. Why was VRF a fit for the David Whitney Building’s thick walls?
The David Whitney Building in Detroit is a historic 19-story structure adapted for hotel rooms, restaurants, a bar, conference areas, and residences. Its marble and limestone walls made extensive new ductwork especially disruptive. Large ducts would have required more demolition, altered ceiling heights, and complicated routes through protected or expensive finishes.
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Buildings’ account of the project quotes Kevin Miskewicz, director of commercial marketing at Mitsubishi Electric Cooling & Heating: “Adding ductwork throughout the building would require extensive construction, changing configurations, lowering ceiling heights in some places and a lot of money spent running it through thick walls.” He added, “VRF turned out to be a good fit for that building because you only needed small penetrations through the walls and ceilings. You could very easily hide the refrigerant piping without impacting the aesthetics of the building itself.”
The published design used several indoor-unit styles to suit different spaces. Mitsubishi Electric’s later David Whitney Building case study confirms a Mitsubishi Electric VRF system and explains that condenser locations were split among the roof, an alley, and basement-level areas. Distributing the outdoor units limited refrigerant line travel and avoided forcing every circuit to one remote location.
This is an architectural coordination problem as much as an HVAC problem. Small piping penetrations can be easier to conceal than duct trunks, but the design still has to address fire stopping, acoustic control, service access, refrigerant concentration limits, condensate, and the visual treatment of grilles or cassettes. The building’s varied uses also make zoning important: a hotel room, restaurant, conference room, and apartment do not have identical schedules or loads.
Mitsubishi Electric HVAC US reports that the project saved $1.8 million. That is a manufacturer-reported project result; the available case study does not provide an independent audit showing how much of the total was caused solely by VRF rather than by the broader adaptive-reuse design, avoided duct construction, or other scope decisions.
What this case demonstrates: In a masonry-heavy historic building, the decisive advantage may be constructability and preservation rather than a published efficiency percentage. Locating outdoor equipment in several practical areas can also be more workable than creating one long, difficult refrigerant route.
How do the three retrofit strategies differ?
All three facilities used VRF, but they solved different constraints. Treating them as a performance league table would be misleading because the sources use different methods and dates.
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| Decision factor | Columbia Square | People’s Petroleum | David Whitney |
|---|---|---|---|
| Primary constraint | Historic glass and mixed-use tenant fit-outs | Occupied, leased floors and an aging chilled-water plant | Thick stone walls and preservation-sensitive interiors |
| Installation pattern | Core-and-shell first, tenant indoor units later | One floor at a time over multiple years | Distributed outdoor units with piping routed through small penetrations |
| Indoor-unit approach | Tenant-selected units added as spaces were configured | Mostly ceiling cassettes, with some wall-mounted units | Several styles selected for hotel, residential, and hospitality areas |
| Documented configuration | 1,244 tons; 44 LG Multi V IV outdoor units; heat-recovery boxes | Daikin VRV, air-cooled heat pump, heat recovery | Mitsubishi Electric VRF; condensers at roof, alley, and basement-level locations |
| Outcome evidence | Manufacturer project profile; LEED Gold renovation status | 2017 trade-report estimates of energy and maintenance savings | 2024 manufacturer-reported $1.8 million saving |
How should an owner evaluate a VRF retrofit?
These projects suggest a practical sequence for deciding whether VRF fits a particular facility. The sequence is a design framework, not a promise that every building will achieve the reported outcomes.
- Map the existing constraints. Document wall construction, historic finishes, ceiling heights, shafts, roof and basement access, electrical capacity, ventilation equipment, and areas that must remain occupied. Columbia Square and David Whitney show why architectural constraints can drive the mechanical concept.
- Divide the building into real operating zones. List tenant boundaries, schedules, solar exposures, internal loads, and spaces with unusual requirements such as restaurants or conference rooms. A zone plan should reflect how the building is used, not merely how floors are drawn.
- Choose the heat-pump or heat-recovery arrangement deliberately. Heat recovery can be useful where different zones may need heating and cooling at the same time, but it adds branch components, controls, and commissioning requirements. The People’s Petroleum and Columbia Square descriptions specifically mention heat-recovery components.
- Plan the installation around occupancy and leasing. Decide whether the project will use a core-and-shell backbone, floor-by-floor turnover, or another sequence. Reserve routes, access panels, isolation points, and controls capacity for later phases.
- Coordinate penetrations and outdoor-unit locations early. Small refrigerant pipes still require approved penetrations, fire stopping, structural review, and service access. David Whitney’s split condenser locations show how several shorter routes may be preferable to one long route.
- Keep ventilation and indoor air quality in the scope. VRF distributes heating and cooling; it does not automatically provide all required outdoor air, exhaust, filtration, or humidity control. Those systems must be designed and commissioned alongside the refrigerant system.
- Set a measurement plan before construction. Establish the old system’s energy baseline, maintenance costs, comfort complaints, tenant schedules, and weather-normalization method. Without that baseline, later savings claims remain estimates rather than a comparable measured result.
- Specify commissioning and service access. Require refrigerant piping tests, controls verification, sensor checks, condensate tests, balancing of ventilation systems, operator training, and a maintenance plan that matches the number of indoor units. A system that is easy to install but difficult to service can undermine the retrofit’s value.
What should readers make of the reported savings?
The figures should be read with their provenance attached. The People’s Petroleum article, published in 2017, described 20–30 percent energy savings as an estimate and a 50 percent maintenance-cost reduction as an expectation. The David Whitney figure of $1.8 million comes from Mitsubishi Electric’s 2024 case study. Columbia Square’s available profile supplies system capacity and equipment counts but does not provide a comparable post-installation energy percentage.
Those differences do not make the projects irrelevant. They show that a retrofit’s value can appear as avoided demolition, preserved historic fabric, continued occupancy, lease-by-lease capital planning, or tenant flexibility rather than as one standardized energy number. They also explain why the cases should not be ranked by savings. The source set combines trade reporting and manufacturer case studies, and none supplies current, independently measured results for all three facilities under a common protocol.
How were these three facilities selected?
The cases are ordered by the distinct retrofit problem they document: Columbia Square for phased tenant customization, People’s Petroleum for floor-by-floor replacement in a leased building, and David Whitney for architectural constraints. Selection is based on the project details available in the Buildings report, the LG and Mitsubishi Electric case studies, and ACHR News’ account of the Tyler installation. It is not based on a common test, benchmark, or independently verified ranking.
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VRF was useful in all three facilities because it matched the building’s constraint. Columbia Square needed a system that could grow with tenant fit-outs. People’s Petroleum needed replacement without emptying a 15-story leased building. David Whitney needed heating and cooling distribution that could pass through a historic structure without filling it with new ductwork.
The transferable lesson is therefore a design process, not a universal equipment specification. Start with preservation, occupancy, zoning, and phasing requirements; then select equipment, piping routes, ventilation systems, and controls that support those requirements. Treat published savings as project-specific claims until a consistent baseline and post-installation measurement demonstrate otherwise.
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FAQ
Is VRF the same thing as VRV?
VRF is the generic term for variable refrigerant flow systems. VRV is a brand-specific name used by Daikin for its VRF product family, which is why the People’s Petroleum coverage calls that installation VRV. The underlying design concept is similar, but equipment, controls, and installation requirements vary by manufacturer.
Can a historic building keep its original windows and finishes with VRF?
It can make preservation easier when smaller refrigerant piping avoids large duct routes, but the result depends on structural, fire-protection, acoustic, and service-access reviews. At Columbia Square, the project profile connects the VRF choice with retaining existing glass; at David Whitney, the documented benefit was reducing disruptive work through thick walls.
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No. Columbia Square is identified as a LEED Gold renovation, but the available source does not assign that certification solely to the HVAC system. Certification depends on the full project and its documented credits, including items outside mechanical equipment.
What should be measured after a phased VRF installation?
Track energy use by phase, weather and occupancy, demand, comfort complaints, maintenance labor and parts, refrigerant alarms, and ventilation performance. Comparing those records with a documented pre-retrofit baseline is more informative than applying a percentage from another building.
Frequently Asked Questions
Is VRF the same thing as VRV?
VRF is the generic term for variable refrigerant flow systems. VRV is a brand-specific name used by Daikin for its VRF product family, which is why the People’s Petroleum coverage calls that installation VRV. The underlying design concept is similar, but equipment, controls, and installation requirements vary by manufacturer.
Can a historic building keep its original windows and finishes with VRF?
It can make preservation easier when smaller refrigerant piping avoids large duct routes, but the result depends on structural, fire-protection, acoustic, and service-access reviews. At Columbia Square, the project profile connects the VRF choice with retaining existing glass; at David Whitney, the documented benefit was reducing disruptive work through thick walls.
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Does installing VRF guarantee LEED certification?
No. Columbia Square is identified as a LEED Gold renovation, but the available source does not assign that certification solely to the HVAC system. Certification depends on the full project and its documented credits, including items outside mechanical equipment.
What should be measured after a phased VRF installation?
Track energy use by phase, weather and occupancy, demand, comfort complaints, maintenance labor and parts, refrigerant alarms, and ventilation performance. Comparing those records with a documented pre-retrofit baseline is more informative than applying a percentage from another building.
