HVAC, which stands for Heating, Ventilation, and Air Conditioning refers to all such thermal power control systems ranging from regular air conditioners used at homes to the highly advanced technological systems employed in the industrial sector in order to provide heat control and indoor comfort. Designed on the principles of thermodynamics, fluid mechanics, and heat transfer, HVAC systems now comprise an integral part of residential apartments as well as industrial sectors.
The instinct for living comfortably is as old as human civilization itself. What began as rope drawn or man-powered fans or even the hypocaust (indoor furnace heating system) of the Romans, and evolved to become electric fans or steam engines were all, in fact, stepping stones that would ultimately lead to the development of the highly modernized and technologically advanced HVAC system. What actually revolutionized the progress in this sphere was, however, the discovery of concepts such as Latent Heat by scientists like Joseph Black, and the studies on thermodynamics by Carlot and Joule. It was as a result of their research that the concept of Heat began to change. People began to recognize heat as a form of energy, and it was after this stage that the laws of thermodynamics came into existence enabling the enormous advancements in technologies thereafter.
The big air conditioning boxes that can be found or regularly seen on the top of office buildings, apartments, skyscrapers or hospitals are in fact, a part of the HVAC system employed in the concerned buildings. While they form the visible part of the HVAC system, there are several other inter related units that constitute the entire system. Even the simple and basic heating or cooling systems employed in our homes for day to day business, may be termed as HVAC systems as they work on the same principles of thermodynamics and operate on the same fundamental principles that are used for the higher and more sophisticated systems used in industrial units.