India's labor productivity is severely impacted by heatwaves, especially for outdoor workers in agriculture, construction, and mining. Increased irrigation and air pollution control exacerbate heat stress, lowering productivity by 2-4% for every degree rise above 27°C. The northern Indian plains are more affected than coastal areas. Heatwaves reduce physical labor supply by a quarter on very hot days, impacting income growth, price stability, and investment. Solutions like cooling and migration are necessary but have limitations and negative externalities. Adaptive strategies are crucial to mitigate these effects.