World of HR: Banks in the UK sweat out the heat wave

June brought record-breaking heat to the UK and much of Europe. In a region known for being largely AC-free, JPMorgan allowed its employees to work from home, but few obliged.

The UK has a minimum temperature requirement for offices (55 degrees Fahrenheit), but it does not have a maximum; employers are encouraged to maintain a “reasonable” temperature, according to the Guardian.

During this latest heat wave, some workers had a difficult time even getting to offices, amid government guidance to travel only if “absolutely essential” and canceled some trains. Those running often lacked AC.

JPMorgan, known for its strict in-office attendance policies, told managers at its London offices that some staff could work from home as the heat wave raged on, according to Bloomberg. In-office attendance dipped just 15% after the advisement. Worth noting is that the company’s offices are air conditioned, while less than 20% of UK homes have AC.

“The whole infrastructure of the city would need upgrading for people and businesses to cope well in a heat wave,” Frances Brown, global workplace lead at engineering firm Cundall, told Bloomberg.

Meanwhile, Citigroup, which has a hybrid work model, told Bloomberg it didn’t have to adjust its policies, as employees could already choose to work from home.

While temperatures may have eased for now, economists warn that heat waves will only get worse, the Wall Street Journal reported, and governments that have resisted AC may (begrudgingly) need to adapt to the changing climate.

“Let’s be dispassionate, data-driven, and decision-relevant,” R. Jisung Park, a labor economist at the University of Pennsylvania’s Wharton School, told Fortune. “What the data says is that if you care about livelihoods, if you care about preserving human life, if you care about economic productivity, then be mindful of at least the potential for extreme temperatures to affect all these human outcomes.”