At 16, Jhansi girl Kalyani Srivastava built an air conditioner for just ₹1,800; her low-cost innovation reportedly cools a room by 4-5°C in an hour without adding to electricity bills

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• In 2017, 16-year-old Kalyani Srivastava from Jhansi, Uttar Pradesh, built a low-cost cooling device called the 'Desi AC' for about ₹1,800.
• The device used a thermocol icebox and a 12-volt DC fan, and was described as solar-powered, so it did not add to household electricity bills.