The origins of HVAC (Heating, Ventilation, and Air Conditioning) systems can be traced back to ancient civilizations, where early forms of climate control and indoor air quality management were developed. Ancient Egyptians used manual methods, such as manually opening and closing windows and utilizing shading devices, to regulate indoor temperatures.
Ancient Romans designed elaborate heating systems known as “hypocausts,” which used hot air from fires to heat the floors and walls of buildings. In the Middle Ages, Europeans continued to use open flames for heating and simple ventilation systems like chimneys.