Early Geothermal System

Geothermal has been used in a highly elegant and durable style in some of the earliest civilizations. The ancient city of Yazd (circa 5000 BC) is a repository of many outstanding examples of geothermal coupled with wind towers. In this geothermal system the cooling properties of the earth (heat sink) were used as a natural air conditioning. The same concept was also employed to keep the water cool for the long and hot summers. Some of these wonderful structures are still standing.

Although geothermal has been known for thousands of years, its uses were restricted and limited in scale. Doubtlessly the structure was expensive and reserved for the elite and public institutions who could afford the initial high costs. With the advent of the modern technology, it is now possible for everyone to enjoy the benefits of this durable and reliable source of energy.