Danfoss

Danfoss is a Danish multinational industrial group founded in 1933 by engineer Mads Clausen in Nordborg, on the island of Als. The company began by developing refrigeration components and grew into a broad supplier of engineered technologies for cooling, heating, air conditioning, motor control, mobile hydraulics, electrification, and energy management. Its products are sold to original-equipment manufacturers, contractors, distributors, utilities, food businesses, building operators, and industrial customers worldwide. The company originated as Dansk Køleautomatik- og Apparatfabrik. Its first major product was an expansion valve for refrigeration equipment, developed after Clausen studied imported American designs and adapted the technology for local production. Danfoss expanded into heating in the early 1940s and developed a thermostatic radiator valve in 1943. The valve was later patented and promoted as an energy-saving product, establishing a long-running connection between the brand and efficient control of energy flows. Danfoss changed its name to Danfoss in 1946 and began international expansion during the 1950s, including construction of a factory in Flensburg, Germany. It added power electronics in 1962, initially producing custom rectifiers, and entered hydraulics in 1964. Its VLT frequency-converter activities, launched in 1968, helped make variable-speed motor control a central part of the group’s industrial portfolio. These technologies allow motors and machinery to operate closer to actual demand, potentially reducing electricity consumption and improving process control. After Mads Clausen died in 1966, his widow Bitten Clausen became chair of the board while their sons were still too young to lead the business. The company subsequently developed into a multinational group with manufacturing, research, sales, and service activities across several regions. China became an important market and manufacturing base, while Europe remained central to the company’s operations and heritage. In 2014 Danfoss acquired Vacon, a Finnish manufacturer of variable-frequency drives, strengthening its position in power electronics and motor-control systems. Danfoss’s current activities span refrigeration and food cooling, air-conditioning systems, district and building heating, compressors, heat-transfer equipment, sensors, valves, controllers, drives, power modules, and hydraulic systems for mobile machinery. Its portfolio also includes electrification and powertrain technologies, including solutions associated with Danfoss Editron, as well as oil-free centrifugal compressor technology marketed under Danfoss Turbocor. Digital control and connected-building products such as Danfoss Ally extend the group’s traditional hardware businesses into monitoring and energy management. The company presents its purpose around engineering solutions that support decarbonization, energy efficiency, electrification, and more productive use of resources. Its technologies are used in buildings, supermarkets, cold chains, factories, data centers, renewable-energy systems, agricultural and construction machinery, and transportation. Danfoss remains privately held, with the Bitten og Mads Clausens Fond as its largest shareholder. Public reference material describes a workforce of more than 41,000 employees, although the precise employee count varies by reporting period.

Danfoss was established in 1933 by Mads Clausen as Dansk Køleautomatik- og Apparatfabrik. Working from the Nordborg area of Denmark, Clausen developed an expansion valve for refrigeration systems after examining imported American products. The device became the foundation of the business and established the company’s early specialization in refrigeration control. The company broadened its scope into heating during the early 1940s. In 1943 Clausen developed a thermostatic radiator valve, which was later patented and promoted as an energy-saving product. Danfoss changed its corporate name in 1946. By the middle of the 1940s, the business employed several hundred people and had outgrown the original farm-based premises, leading to plans for a larger factory. Internationalization began in the 1950s. Danfoss built a production facility in Flensburg, Germany, completed in 1958. The company then expanded beyond refrigeration and heating. It began producing power-electronics products in 1962, initially making custom rectifiers, and produced its first hydraulic component in Nordborg in 1964. In 1968 it started production of VLT frequency converters. Variable-frequency drives subsequently became one of the group’s defining technology areas, complementing its refrigeration, heating, and hydraulic businesses. Mads Clausen died in 1966. Because his sons were not yet old enough to manage the company, his widow, Bitten Clausen, became chair of the board. Under family stewardship, Danfoss continued to internationalize and develop a diversified industrial portfolio. The Bitten og Mads Clausens Fond was established in 1971 as a self-governing foundation and became the company’s largest shareholder, providing a long-term ownership structure. Over the following decades, Danfoss built businesses serving refrigeration, air conditioning, heating, industrial drives, and mobile hydraulics. It joined the United Nations Global Compact in 2002, linking its corporate responsibility work to international principles covering social and environmental conduct. The group also developed technologies for more efficient buildings, food cooling, industrial processes, and machinery. Danfoss sold its former domestic-compressor division in 2010; that business was renamed Secop. The company continued to expand in Asia, particularly China, where it added factories and treated the country as an important market. In 2014 it acquired Vacon, strengthening its position in variable-frequency drives and power electronics. Later activities increasingly included electrification, digital controls, data-driven energy management, and systems intended to reduce emissions from buildings, industry, transport, and mobile equipment. The modern Danfoss Group is a privately held multinational industrial business headquartered in Nordborg. Its principal technology areas include climate solutions, power solutions, drives, and related controls. The group serves equipment manufacturers and end users in sectors ranging from supermarkets and food logistics to district energy, factories, data centers, agriculture, construction, and transportation. Its strategic identity is closely associated with efficient control of energy, electrification, and engineering responses to climate and resource constraints.

1. 2025Hydro Holding acquisition completed

   Danfoss Power Solutions completed the acquisition of Italian hose-fittings manufacturer Hydro Holding and incorporated it into its fluid-conveyance activities.

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2. 2014Vacon acquired

   Danfoss acquired Vacon, adding scale and technology in variable-frequency drives.

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3. 2010Domestic-compressor division sold

   Danfoss sold its former domestic-compressor business, which became Secop.

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4. 2002Joins United Nations Global Compact

   Danfoss joined the United Nations Global Compact and its principles on social and environmental responsibility.

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5. 1971Family foundation established

   Bitten Clausen established the Bitten og Mads Clausens Fond, which became Danfoss’s largest shareholder.

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6. 1968VLT frequency-converter production begins

   Danfoss began production of VLT frequency converters, establishing a major drive-technology business.

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7. 1964Hydraulics introduced

   Danfoss produced its first hydraulic component at the Nordborg factory.

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8. 1962Power-electronics production begins

   The company entered power electronics with custom-built rectifiers.

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9. 1958German factory completed

   Danfoss completed a production facility in Flensburg, Germany, supporting its international expansion.

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10. 1946Name changed to Danfoss

    The company adopted the Danfoss name.

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11. 1943Thermostatic radiator valve developed

    Mads Clausen developed a thermostatic radiator valve that later became an important energy-saving product.

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12. 1933Company founded

    Mads Clausen founded Dansk Køleautomatik- og Apparatfabrik in Nordborg, Denmark, beginning with refrigeration technology.

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A privately held global industrial technology group positioned around energy efficiency, electrification, climate control, industrial automation, and decarbonization.

• Danfoss refrigeration controlsRefrigeration1933

  This category includes expansion valves, controllers, sensors, compressors, and related components used to regulate refrigerant flow and temperature. Refrigeration products serve commercial food cooling, industrial refrigeration, cold-chain, and air-conditioning applications.

• Thermostatic radiator valvesHeating controls1943

  Danfoss thermostatic radiator valves regulate heat output from radiators according to room temperature. The product family grew from Mads Clausen’s 1943 invention and remains associated with room-level heating control and energy conservation.

• VLT drivesVariable-frequency drives1968

  VLT frequency converters control the speed and torque of electric motors. They are used in pumps, fans, conveyors, compressors, production equipment, and building systems to improve process control and align motor energy use with demand.

• Danfoss TurbocorCompressors

  Danfoss Turbocor is associated with oil-free centrifugal compressor technology for commercial and industrial air-conditioning and cooling systems. The offering is designed for efficient, electronically controlled compression in large cooling installations.

• Danfoss EditronElectrification

  Danfoss Editron develops electric and hybrid powertrain technologies, including motors, generators, power converters, and system controls. Applications include marine equipment, off-highway machinery, and other vehicles requiring electrified propulsion or auxiliary power.

• Danfoss AllyConnected heating controls

  Danfoss Ally is a connected heating-control offering intended to let users monitor and adjust heating systems through digital interfaces. It extends Danfoss’s heating-controls business into connected-home and energy-management use cases.

• Danfoss Power Solutions hydraulicsMobile hydraulics1964

  Danfoss Power Solutions supplies hydraulic components, controls, valves, motors, pumps, and related systems for mobile machinery. Customers and applications include construction, agriculture, material handling, and other off-highway equipment.

• 2025Acquire Hydro HoldingM&A

  Danfoss Power Solutions expanded its fluid-conveyance capabilities through an acquisition in the hose-fittings sector.

  What changed. Danfoss completed the acquisition of Italian manufacturer Hydro Holding after regulatory approval.

  Aftermath. Hydro Holding was integrated as a separate business unit within Danfoss Power Solutions’ fluid-conveyance division.

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• 2014Acquire VaconM&A

  Danfoss sought to strengthen its position in variable-frequency drives and power electronics.

  What changed. The group acquired Finnish drive manufacturer Vacon.

  Aftermath. Vacon’s technology and operations became part of Danfoss’s broader drives and power-solutions activities.

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• 2010Divest domestic-compressor businessM&A

  Danfoss restructured its compressor activities and separated its former domestic-compressor division.

  What changed. The domestic-compressor business was sold and subsequently renamed Secop.

  Aftermath. Danfoss retained focus on its wider refrigeration, climate, controls, drives, and hydraulics portfolio.

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• 2011Refrigeration-compressor cartelControversy

  Danfoss was fined in European and United States proceedings connected with unlawful coordination among refrigeration-compressor manufacturers between approximately 2004 and 2007. The conduct was treated as a competition violation that harmed customers through reduced competition and coordinated pricing.

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• 2010Debate over wartime commercial activityControversy

  Danish press reports revisited claims that Danfoss products had been sold to German occupying forces during the Second World War. Danfoss disputed the characterization of direct trading, while historical accounts commissioned or published about the occupation were discussed in relation to their independence.

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• 2025Danfoss Power Solutions completes Hydro Holding acquisition

  Danfoss announced completion of the acquisition of Italian hose-fittings manufacturer Hydro Holding after regulatory approval, integrating it into the fluid-conveyance activities of Danfoss Power Solutions.

  M&A
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• 2014Danfoss completes acquisition of Vacon

  Danfoss acquired Vacon, a Finnish variable-frequency-drive manufacturer, expanding its power-electronics and motor-control business.

  M&A
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• 2013Danfoss expands Chinese manufacturing footprint

  The company opened two factories in China on the same day, reflecting the importance of China as a manufacturing and commercial market.

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1. Danfoss
2. Danfoss official website
3. Danfoss management