Shabestan

'night room' is an underground space that can be usually found in traditional architecture of mosques, houses, and schools in ancient Iran.

During the Sasanian Empire and the subsequent Islamic periods, shabestan also referred to inner sanctums of the shahs where their concubines resided.

Later these structures came to be called زنانه zanāneh "women's residence" and اندرونی andaruni "inner private zone".

The air from the qanat was drawn into the tunnel at some distance away and is cooled both by contact with the cool tunnel walls/water and by the giving up of latent heat of evaporation as water evaporates into the air stream.

In dry desert climates this can result in a greater than 15 °C (27 °F) reduction in the air temperature coming from the qanat.