Man Cools NYC's Hottest Subway Stations One Jug at a Time

Jack Klein stands on a sweltering subway platform watching his thermometer climb past 100°F while tourists and commuters around him wilt in what feels like an underground oven. But unlike other passengers just trying to survive their commute, this 31-year-old construction manager decided to do something about it.

For two years, Klein has been tracking temperatures in Manhattan's hottest subway stations, and the numbers tell a shocking story. At 14th Street-Union Square, the heat index recently hit 132°F, more than 30 degrees hotter than street level. That's well into heatstroke territory.

Klein started by installing teardrop-shaped thermometers on steel beams in seven stations, posting videos of the brutal conditions commuters face daily. Most disappeared or fell, but the attention sparked something bigger.

Now Klein hauls large water dispensers down to platforms, hands out fans to overheated passengers, and pushes transit officials to install proper cooling systems. "I still see this as a public health issue," he says, even when longtime New Yorkers tell him to just suck it up.

The problem isn't just uncomfortable commutes. Subway maintenance workers and cleaners spend hours in these temperatures, conditions their union calls dangerous. And it's getting worse every year as global temperatures climb.

The Ripple Effect

Klein's one-man campaign highlights a challenge cities around the world are racing to solve. Underground stations trap heat in concrete and steel, while trains blast hot exhaust from their air conditioning systems. Each packed commuter adds about 100 watts of body heat to the mix.

New York's Metropolitan Transportation Authority acknowledges the crisis. "Every year is getting hotter because of climate change," says CEO Janno Lieber. The agency is now testing cooling systems and improving ventilation in stations built over a century ago for a different climate.

Klein's advocacy is pushing the conversation forward. Transit officials are finally treating extreme subway heat not as an inevitable summer annoyance, but as a solvable public health challenge requiring urgent action.

One water cooler at a time, Klein is showing that individual action can spotlight systemic problems and inspire real solutions for millions of daily riders.