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Wind towers (Badgir) are important elements in traditional Iranian architecture, providing natural air-conditioning in hot, dry and humid climates for thousands of years.
These towers rise not only on ordinary houses but also on top of water cisterns (Ab-anbar) and mosques. The function of the cistern found below most wind towers in warm dry regions was to help balance humidity inside the structure. In many desert buildings, wind towers were built on top of a lavabo (howzkhaneh, which functioned as a summer courtyard). The wind was directed over the pool where it evaporated the water and took the cool air into other rooms. The first historical evidence of wind towers in Iran dates back to the fourth millennium BC.