Heating, Ventilation, and Air conditioning (HVAC) are the scientific technology of vehicular and indoor environmental comfort. The purpose of HVAC systems is to offer acceptable indoor air quality and thermal comfort to the occupants of the building or rooms. This HVAC system technology is the result of the collective efforts of HVAC industry and technical experts who aim at developing a standard system of service for their clients.

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HVAC is a combination of various processes including combustion, heat flow control, circulation of air, mechanical ventilation, as well as energy consumption for completing the tasks involved in heating, ventilation, air conditioning (HVAC) systems. HVAC systems use several mechanisms such as pumps, filters, compressors, fans, and closed loop systems that can be operated using power, natural gas, oil or a combination of power, natural gas, and oil. In the HVAC industry, the term “thermal” refers to the transformation of heat into mechanical motion. The process of heating or cooling can either be reversible or require extensive inputs such as electricity, water, and mechanical ventilation.

Another major aspect of HVAC technology is air control systems. Air conditioners or heating equipment, for example, use the principle of air conduction to transfer heat from one location to another. A fan, for instance, uses the principle of cyclical airflow to move air in and out of a room. These HVAC technologies can vary based on the location, intended use, and the complexity of the application.