Information: - Carrier is a brand of United Technologies Corporation Building & Industrial Systems, based in Farmington, Connecticut. Carrier was founded in 1915 as an independent, American company, manufacturing and distributing heating, ventilating and air conditioning (HVAC) systems, as well as commercial refrigeration and food service equipment. As of 2012, it was a $12.5 billion company with over 43,000 employees serving customers in 170 countries on six continents. - Air conditioning (often referred to as AC, A.C., or A/C) is the process of removing heat from a confined space, thus cooling the air, and removing humidity. Air conditioning can be used in both domestic and commercial environments. This process is used to achieve a more comfortable interior environment, typically for humans or animals; however, air conditioning is also used to cool/dehumidify rooms filled with heat-producing electronic devices, such as computer servers, power amplifiers, and even to display and store artwork. - Farmington is a town located in Hartford County in the Farmington Valley area of central Connecticut in the United States. The population was 25,340 at the 2010 census. As an affluent suburb of Hartford, it is home to the world headquarters of several large corporations including Carrier Corporation, Otis Elevator Company, and Carvel. - Fluid mechanics is a branch of physics concerned with the mechanics of fluids (liquids, gases, and plasmas) and the forces on them. Fluid mechanics has a wide range of applications, including for mechanical engineering, civil engineering, chemical engineering, geophysics, astrophysics, and biology. Fluid mechanics can be divided into fluid statics, the study of fluids at rest; and fluid dynamics, the study of the effect of forces on fluid motion. It is a branch of continuum mechanics, a subject which models matter without using the information that it is made out of atoms; that is, it models matter from a "macroscopic" viewpoint rather than from "microscopic". Fluid mechanics, especially fluid dynamics, is an active field of research with many problems that are partly or wholly unsolved. Fluid mechanics can be mathematically complex, and can best be solved by numerical methods, typically using computers. A modern discipline, called computational fluid dynamics (CFD), is devoted to this approach to solving fluid mechanics problems. Particle image velocimetry, an experimental method for visualizing and analyzing fluid flow, also takes advantage of the highly visual nature of fluid flow. - Heating, ventilation and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. 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 ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers). - The Farmington Valley is located along the western boundary of Hartford County in Connecticut, bordering Litchfield County immediately to the west. It is defined by the Farmington River, which runs through it. Physiographically, the valley is lowlands and floodplain flanked by the Litchfield Hills on the west (which itself is the northern terminus of the larger Mid-Atlantic Highlands Region) and Talcott Mountain on the east (a section of the more extensive Metacomet Ridge). - Connecticut is the southernmost state in the New England region of the northeastern United States. Connecticut is also often grouped along with New York and New Jersey as the Tri-State Area. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its capital city is Hartford, and its most populous city is Bridgeport. The state is named for the Connecticut River, a major U.S. river that approximately bisects the state. The word "Connecticut" is derived from various anglicized spellings of an Algonquian word for "long tidal river". - United Technologies Corporation ( UTC ) is an American multinational conglomerate headquartered in Farmington , Connecticut . It researches , develops , and manufactures high - technology products in numerous areas , including aircraft engines , HVAC , fuel cells , elevators and escalators , fire and security , building systems , and industrial products , among others . UTC is also a large military contractor , producing missile and aircraft systems . Gregory Hayes is the current CEO . Given the information, choose the subject and object entities that have the relation of 'headquarters location'.
A:
united technologies , hartford