Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. "Refrigeration" is sometimes added to the field's abbreviation as HVAC&R or HVACR, or "ventilation" is dropped, as in HACR.
Willis Haviland Carrier was an American engineer, best known for inventing modern air conditioning. Carrier invented the first electrical air conditioning unit in 1902. In 1915, he founded Carrier Corporation, a company specializing in the manufacture and distribution of heating, ventilation, and air conditioning (HVAC) systems.
United Technologies Corporation (UTC) was an American multinational conglomerate headquartered in Farmington, Connecticut. It researched, developed, and manufactured products in numerous areas, including aircraft engines, aerospace systems, HVAC, elevators and escalators, fire and security, building automation, and industrial products, among others. UTC was also a large military contractor, getting about 10% of its revenue from the U.S. government. In April 2020, UTC merged with the Raytheon Company to form Raytheon Technologies, later renamed RTX Corporation.
Johnson Electric (德昌電機控股有限公司) is a provider of motors, actuators, motion subsystems and related electro-mechanical components for automotive, industrial and medical applications. Johnson Electric has manufacturing facilities in 22 countries.
GE Security was a division of General Electric's GE Enterprise Solutions. It was acquired by UTC on March 1, 2010, and became part of UTC Fire & Security. GE Security's division provides intrusion alarm systems, integrated security systems, fire systems, access control, video surveillance, explosives and illegal drug detection, key control/lockbox, fiber optic transmission, machine guarding, and more. GE Security was based in Bradenton, Florida.
Carrier Global Corporation is an American multinational heating, ventilation, and air conditioning (HVAC), refrigeration, and fire and security equipment corporation based in Palm Beach Gardens, Florida. Carrier was founded in 1915 as an independent company manufacturing and distributing HVAC systems, and has since expanded to include manufacturing commercial refrigeration and food service equipment, and fire and security technologies.
Kidde is a brand subsidiary of Carrier Global that manufactures and distributes fire detection and suppression equipment, as well as smoke and CO alarm units. Kidde is one of America's largest manufacturers of smoke alarms and fire safety products. Kidde is headquartered in Mebane, NC.
Chubb Fire & Security is a global organization specialised in fire protection and security systems, and is a subsidiary of APi Group Corporation.
Lennox International Inc. is a provider of climate control products for the heating, ventilation, air conditioning, and refrigeration markets. The company is based outside Dallas, Texas in the United States and has operations globally.
The Weather Eye was a trade name for a Nash Motors-designed fresh-air system for automobile passenger compartment heating, cooling, and ventilating. The Nash "All-Weather Eye" was the first automobile air conditioning system for the mass market. The use of the Weather Eye name for automobile passenger heating and air conditioning systems continued in American Motors Corporation (AMC) vehicles.
Air conditioning, often abbreviated as A/C (US) or air con (UK), is the process of removing heat from an enclosed space to achieve a more comfortable interior environment and in some cases also strictly controlling the humidity of internal air. Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). Heat pumps are similar in many ways to air conditioners, but use a reversing valve to allow them both to heat and to cool an enclosed space.
Tadiran refers to a former Israeli conglomerate, which was founded in 1962 by the merger of two companies, Tadir and Ran. The name of the company is a joining of both companies’ names.
The Viessmann Group is a German manufacturer of heating and refrigeration systems headquartered in Allendorf (Eder), Germany. With 22 production companies in 12 countries, distribution companies and representative offices in 74 countries and 120 sales offices throughout the world, Viessmann is international in its orientation. More than 54 percent of turnover is generated abroad. Since January 2022, the company is led by Martin Vießmann, Maximilian Viessmann (Group-CEO) and Ulrich Hüllmann (CFO). In April 2023, Viessmann announced that it would sell its heat pump division to its US competitor Carrier Global for €12 billion. The transaction was completed on January 2024, Max Viessmann joins the Board of Carrier Global
The Building Engineering Services Association (BESA), until 2012 the Heating and Ventilating Contractors' Association, and from then until 2016, B&ES, is the main UK trade association for companies that design, install, commission and maintain heating, ventilation, air conditioning, refrigeration (HVACR) and related engineering projects.
Trane Technologies plc is an American manufacturing company focused on heating, ventilation, and air conditioning (HVAC) and refrigeration systems. The company traces its corporate history back more than 150 years and was created after a series of mergers and spin-offs. In 2008, HVAC manufacturer Trane was acquired by Ingersoll Rand, a US industrial tools manufacturer. In 2020, the tools business was spun off as Ingersoll Rand and the remaining company was renamed Trane Technologies.
Automotive air conditioning systems use air conditioning to cool the air in a vehicle.
Bock GmbH is part of the DANFOSS Group since March 2023. The company is a manufacturer of compressors and condensing units for stationary and mobile refrigeration and air-conditioning. The products are exclusively used in commercial and industrial environments.
CS Group, initially known as CS Communication & Systèmes, is a French information-technology service company listed on the Paris Bourse as a member of the CAC Small index. The company designs information systems, develops and integrates software, manages projects and deploys industrial applications, and provides science, technology, and consulting services. CS Group is the French leader in air traffic control, the third-biggest supplier of traffic-management systems in the world and provides information technology consulting services.
RAE Systems, Inc., or RAE System by Honeywell, is a provider of wireless, gas and radiation detection instruments and systems that enable real-time safety and security threat detection to help mitigate risk, and protect workers, contractors, the public, and assets. RAE Systems is located in San Jose, California. The company was founded in 1991 by Robert I. Chen and Peter Hsi.
RTX Corporation, formerly Raytheon Technologies Corporation, is an American multinational aerospace and defense conglomerate headquartered in Arlington, Virginia. It is one of the largest aerospace and defense manufacturers in the world by revenue and market capitalization, as well as one of the largest providers of intelligence services. In 2023, the company's seat in Forbes Global 2000 was 79. RTX manufactures aircraft engines, avionics, aerostructures, cybersecurity solutions, guided missiles, air defense systems, satellites, and drones. The company is also a large military contractor, getting a significant portion of its revenue from the U.S. government.
US$ 17.812 billion (2017) [3] 
