India is getting hotter. Not gradually, not quietly — but urgently, undeniably, and at a scale that can no longer be ignored. And yet, the way we cool ourselves has barely changed in decades. The air conditioner still reigns, still guzzles electricity, still throws hot air back into the very streets it’s supposed to be cooling. Bringing a change to this is Jeeten Desai, co-founder of Ambiator Cools, along with Tiger Aster — a Hyderabad-based startup that has built a 5-ton cooling unit that uses 80 percent less electricity, exhausts air cooler than the outside temperature, and is manufactured entirely...