A Yakhchal is basically a giant ancient Persian cooler.
If the Yakhchal had spread to areas it didn't in OTL, like for example Muslim Iberia, or had been invented in areas it wasn't in OTL, for example the ancient Southwestern US by the Anasazi or the arid parts of the Andes in the Inca Empire, what effects might this have?
If the Yakhchal had spread to areas it didn't in OTL, like for example Muslim Iberia, or had been invented in areas it wasn't in OTL, for example the ancient Southwestern US by the Anasazi or the arid parts of the Andes in the Inca Empire, what effects might this have?