Residents of the troglodyte village of Trôo say their cave homes remain naturally cool year-round, offering an energy-efficient refuge as heatwaves become more frequent across France.

Millions in France are grappling with scorching heat, but Jean-Luc Eclercy-Deterpigny is not worried as his living room inside a former quarry offers refreshing refuge.

TROO: Millions in France are grappling with scorching heat, but Jean-Luc Eclercy-Deterpigny is not worried as his...