In India, a 3,000-year-old technology is hitting the shelves—and flying off them—as South Asians struggle with rising summer temperatures.

Terracotta’s porous surface makes it a uniquely timeless passive cooling system. As water soaks into the pores, it permits evaporation to carry the heat of the vessel’s immediate surroundings out and away.

This principle has been cooling Indian homes since the Harappan Civilization that lived in the Indus Valley from ancient times. Yet it still has a role to play in the India of today, where companies are leveraging terracotta’s passive cooling to chill everything from buildings to food.

MittiCool is a company that manufactures terracotta refrigerators—capable of keeping items cool and preserved for 3 to 5 days in optimal conditions—all without powe

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