Liebert Corporation
Liebert Corporation was an American pioneer in precision cooling, conditioned power, and infrastructure systems for computer rooms and data-processing facilities.
Last updated August 31, 2026
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Overview
Liebert Corporation was an American technology and industrial-equipment company focused on the environmental and electrical infrastructure required by computer rooms, telecommunications facilities, and other data-processing environments. Headquartered in Westerville, Ohio, it became associated with precision air conditioning, power protection, server-room equipment, monitoring systems, and related services. The company is historically important because it helped establish dedicated computer-room cooling as a distinct product category rather than treating computer facilities as ordinary commercial air-conditioning applications. The business originated with Capitol Refrigeration Industries, founded by Ralph C. Liebert in 1946. Liebert developed an early precision-air-conditioning prototype in his garage. In the first half of the 1960s, the prototype was presented to IBM in Chicago, where its suitability for computer installations was recognized. IBM subsequently helped Liebert present the invention at the World Computer Conference in Philadelphia. In 1965, Ralph Liebert founded Liebert Corporation as a manufacturer of air-conditioning units designed specifically for computer-room conditions, including controlled temperature and humidity. This specialization addressed the sensitivity of early computing equipment to heat, moisture, and environmental fluctuation. Liebert expanded beyond cooling during the 1970s and 1980s. In 1977, it established Conditioned Power Corporation to design and manufacture power distribution, conditioning, and monitoring systems for data-processing customers. The power business later became a Liebert division after the company went public. In 1983, Liebert acquired Programmed Power Corporation from Franklin Electric, extending its capabilities into uninterruptible power supplies. The combination of environmental control and power protection gave the company a broader role in maintaining the availability of computer systems. The company also invested in production and international operations. A major manufacturing facility opened in Delaware, Ohio, in 1980, the same year that Ralph Liebert's son Larry L. Liebert assumed management of the business. Liebert established a plant in Cork, Ireland, in 1983. In 1985, it organized Liebert Global Services and introduced SiteScan, a site-management system intended to help customers monitor and manage facility infrastructure. Liebert became a public company through an initial public offering on NASDAQ in 1981. Emerson Electric acquired the company in 1987 in a stock transaction valued at $430 million. Liebert continued as an Emerson subsidiary until 2000, when its network and computer-protection activities were incorporated into Emerson Network Power. In 2016, Emerson Network Power was acquired by Platinum Equity and renamed Vertiv. Consequently, Liebert Corporation no longer operates as an independent company, while the Liebert name and product heritage continued within the Vertiv infrastructure portfolio. The historical brand is therefore best understood as a predecessor and foundational business of Vertiv rather than as a current standalone corporation.
History
Liebert Corporation's origins date to 1946, when Ralph C. Liebert founded Capitol Refrigeration Industries. The company developed from refrigeration work into a specialist supplier for the emerging computer industry. Ralph Liebert reportedly created an early precision-air-conditioning prototype in his garage. Unlike ordinary building air conditioning, the system was intended to maintain the tightly controlled temperature and humidity conditions required by computer equipment. In early 1965, the prototype was introduced to IBM in Chicago. IBM recognized its potential and arranged for Liebert to demonstrate the invention at the World Computer Conference in Philadelphia. That year, Ralph Liebert founded Liebert Corporation, which became an early dedicated manufacturer of air-conditioning equipment for computer rooms. The company's specialization helped define precision cooling as a separate branch of facilities engineering for data-processing operations. Liebert broadened its product scope in 1977 by launching Conditioned Power Corporation. The subsidiary designed and manufactured power-distribution, power-conditioning, and monitoring systems for the data-processing industry. Conditioned Power remained wholly owned until 1981, when it became a Liebert division following the company's initial public offering. In 1980, Liebert opened a major manufacturing facility in Delaware, Ohio. That year, Larry L. Liebert, Ralph Liebert's son, took over management of the company. The company entered public markets in 1981 through an offering on NASDAQ. In 1983, it acquired Programmed Power Corporation from Franklin Electric. This transaction expanded Liebert's power business into the design and manufacture of uninterruptible power supplies, complementing its cooling and conditioning products. Liebert also opened a manufacturing plant in Cork, Ireland, in 1983, indicating an expansion of its production footprint beyond the United States. In 1985, Liebert organized Liebert Global Services and introduced SiteScan, a site-management system. These developments extended the company from equipment manufacturing into monitoring and service activities. The broader offering addressed several elements of computer-facility availability: cooling, power quality, backup power, infrastructure visibility, and support. Emerson Electric acquired Liebert in 1987 for $430 million in stock. Liebert remained an Emerson subsidiary for more than a decade. In 2000, Emerson combined its network and computer-protection operations into Emerson Network Power, and Liebert became part of that platform rather than continuing as a separate corporate organization. Emerson Network Power later became the subject of a change in ownership and identity. Platinum Equity acquired the division in 2016 and renamed it Vertiv. The corporate succession means that Liebert Corporation is defunct as an independent entity, but its name represents an important lineage within the modern data-center-infrastructure industry. The cooling, power-protection, rack, monitoring, and service activities associated with Liebert formed part of the business foundation carried into Vertiv. The company's historical contribution was to treat computer-facility environmental and electrical reliability as an integrated infrastructure discipline.
- 2016
Business renamed Vertiv
[1]After Platinum Equity acquired Emerson Network Power, the division was renamed Vertiv.
- 2000
Integrated into Emerson Network Power
[1]Emerson folded its network and computer-protection businesses, including Liebert, into Emerson Network Power.
- 1987
Acquired by Emerson Electric
[1]Emerson Electric acquired Liebert Corporation in a stock transaction valued at $430 million.
- 1985
Global services and SiteScan introduced
[1]Liebert organized Liebert Global Services and introduced SiteScan, a site-management system for infrastructure oversight.
- 1983
Programmed Power acquired
[1]The acquisition of Programmed Power Corporation from Franklin Electric expanded Liebert's capabilities into uninterruptible power supplies. Liebert also opened a plant in Cork, Ireland.
- 1981
Initial public offering
[1]Liebert became a public company through an initial public offering on NASDAQ.
- 1980
Delaware manufacturing facility opened
[1]Liebert opened a major manufacturing facility in Delaware, Ohio, while Larry L. Liebert assumed management of the company.
- 1977
Conditioned Power Corporation launched
[1]Liebert created Conditioned Power Corporation to develop power-distribution, conditioning, and monitoring systems for data-processing facilities.
- 1965
Liebert Corporation established
[1]Ralph C. Liebert founded Liebert Corporation as a manufacturer of computer-room air-conditioning systems with dedicated temperature and humidity controls.
- 1946
Capitol Refrigeration Industries founded
[1]Ralph C. Liebert founded Capitol Refrigeration Industries, the predecessor of Liebert Corporation.
Products and positioning
Specialist infrastructure provider for computer rooms and data-processing facilities, combining precision environmental control, power continuity, monitoring, equipment enclosures, and related services.
Cooling systems · 1965
Precision computer-room air conditioning
Liebert's foundational product category consisted of air-conditioning systems designed specifically for computer rooms. These systems controlled temperature and humidity more precisely than conventional building air conditioning, helping protect computing equipment and support reliable data-processing operations.
Power infrastructure · 1977
Conditioned power systems
Through Conditioned Power Corporation and subsequently its power division, Liebert developed systems for power distribution, conditioning, and monitoring. The products extended the company beyond thermal management into the electrical infrastructure supporting computer facilities.
Power protection · 1983
Uninterruptible power supplies
Following the 1983 acquisition of Programmed Power Corporation, Liebert added uninterruptible power supplies to its portfolio. These systems addressed continuity of operation during power disturbances and complemented the company's conditioned-power and monitoring activities.
Infrastructure monitoring · 1985
SiteScan
Introduced in 1985, SiteScan was a site-management system associated with Liebert's effort to provide visibility into computer-facility infrastructure. It formed part of the company's expansion into monitoring and management services alongside physical cooling and power equipment.
Infrastructure services · 1985
Liebert Global Services
Liebert Global Services was organized in 1985 to support the company's equipment and customer infrastructure activities. Its creation reflected a broader offering that combined manufactured systems with service and facility-management capabilities.
Data-center enclosures
Server racks and integrated cabinets
Liebert's broader infrastructure portfolio included server racks and integrated cabinets for organizing and housing computer equipment. These products complemented cooling, power, and monitoring systems within computer rooms and data-center environments.
Brand decisions
2016
Transfer Emerson Network Power to Platinum EquityM&ABackground
Emerson separated its network-power division from the broader Emerson organization.
Action taken
Platinum Equity acquired Emerson Network Power and renamed it Vertiv.
Aftermath
The Liebert business lineage continued under Vertiv, while Liebert Corporation remained defunct as an independent corporate entity.
2000
Integrate into Emerson Network PowerStrategyBackground
Emerson consolidated its network and computer-protection businesses into a platform organization.
Action taken
Liebert's business was folded into Emerson Network Power.
Aftermath
Liebert ceased operating as a separately organized Emerson business, while its product and brand heritage continued within the network-power group.
1987
Accept acquisition by Emerson ElectricM&ABackground
Liebert had become a specialized provider of cooling and power infrastructure for computing environments.
Action taken
Emerson Electric acquired Liebert Corporation in a stock transaction valued at $430 million.
Aftermath
Liebert operated as an Emerson subsidiary until its integration into Emerson Network Power in 2000.
Acquisition value. $430 million (1987 acquisition)
1983
Acquire Programmed Power CorporationM&ABackground
Liebert sought to broaden its power business beyond distribution, conditioning, and monitoring.
Action taken
Liebert acquired Programmed Power Corporation from Franklin Electric.
Aftermath
The transaction added uninterruptible power-supply design and manufacturing capabilities.
1981
Become a publicly traded companyStrategyBackground
Liebert had expanded its product scope and manufacturing footprint and sought public-market financing.
Action taken
The company completed an initial public offering and began trading on NASDAQ.
Aftermath
Conditioned Power Corporation became a Liebert division in connection with the company's public-company structure.
1977
Expand from cooling into conditioned powerStrategyBackground
Liebert's computer-room customers required not only controlled temperature and humidity but also reliable electrical infrastructure.
Action taken
The company established Conditioned Power Corporation to design and manufacture power-distribution, conditioning, and monitoring systems for data-processing facilities.
Aftermath
The power business later became a Liebert division and provided a platform for further expansion into power protection.
Recent events
- 2016
Emerson Network Power becomes Vertiv[1]
M&A
Platinum Equity acquired Emerson Network Power and renamed the business Vertiv, ending Liebert Corporation's identity as an independent company while preserving its business heritage within the new organization.
- 2000
Liebert business folded into Emerson Network Power[1]
Other
Emerson consolidated its network and computer-protection businesses, including Liebert, into the Emerson Network Power platform group.
- 1987
Emerson Electric acquires Liebert Corporation[1]
M&A
Emerson Electric acquired Liebert Corporation in a stock transaction valued at $430 million, bringing the computer-infrastructure specialist into Emerson's portfolio.
Sources1 sources
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