HVAC, (heating, ventilation, and Air Conditioning) are a technological technique of vehicular and indoor environmental comfort. HVAC is generally defined as the transfer of heat or cool via airflow. Its basic purpose is to provide suitable indoor air quality and thermal comfort to the living space. This technique is employed in a vast number of applications in different sectors such as science and technology, hospitality, healthcare, and manufacturing.

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The term ‘HVAC’ is usually utilized in relation with heating, ventilation and air conditioning systems. HVAC consists of heating and ventilation, while air conditioning relates to the cooling system. HVAC techniques are categorized broadly into three categories, which include energy-efficient, hybrid, and geothermal. In addition, HVAC can be controlled by means of remote control or by automation, depending upon the specific requirements.

With a large number of HVAC systems in use in various commercial and residential buildings, it has now become mandatory for them to be certified by accredited HVAC agencies. A variety of professional bodies offers certification for the same, such as the American Society of Home Inspectors, and the National Association of Manufacturers, Inc. Furthermore, it has been mandated by law that HVACs must be maintained to ensure their efficiency and safety. HVAC services are provided by trained professionals who are knowledgeable about their field. Most companies offer free heating, ventilation, cooling, and air conditioning quote to customers on the Internet.