NYC commuter turns into heat watchdog, urging cooling solutions for sweltering subways

Over the past two years, Jack Klein has become a self-appointed subway heat monitor, affixing teardrop thermometers to steel beams in seven Manhattan stations and livestreaming the soaring temperatures, which have peaked at 101°F with a "real feel" of 132°F. He reports that the oppressive conditions strain commuters and endanger staff, prompting him to hand out water and call for improved seating and functional fans. MTA chief Janno Lieber admits the aging ventilation design struggles to cope with climate-induced heat, while Mayor Zohran Mamdani announced a study to capture station heat for a thermal-energy network that could warm municipal buildings in winter.

Environmental engineer Giorgia Chinazzo warns that underground systems, built for a cooler era, are increasingly ill-suited to the warming climate. The initiative, if funded, would target the Brooklyn Bridge-City Hall and Chambers Street complex, aiming to lower platform temperatures by a few degrees and demonstrate a reusable heat-recovery model for other cities.