Residents of the troglodyte village of Trôo in southern France are using ancient cave homes to escape extreme heatwaves [1, 2].

As climate patterns shift, these dwellings offer a sustainable alternative to energy-intensive cooling systems during periods of soaring temperatures. The natural insulation of the limestone provides a blueprint for energy-efficient living in a warming climate [1, 3].

Located in the Ardèche region, the village consists of homes carved directly into the rock [2, 4]. The thermal mass of the limestone keeps the interiors naturally cool throughout the year, regardless of the external temperature [1, 3].

Jean-Luc Eclercy-Deterpigny, the village mayor, described the experience of living in the rock. "We are privileged to have a living room buried in the rock that stays cool like a fridge," Eclercy-Deterpigny said [1].

This natural cooling arrives as millions of people across France grapple with scorching heat [1]. While urban centers rely on air conditioning, the residents of Trôo maintain a stable environment without the need for high electricity consumption [3, 5].

Residents said their cave homes stay naturally cool all year round, offering an energy-efficient refuge [2]. The architecture utilizes the earth's constant temperature to regulate the living space, a method that reduces the carbon footprint associated with modern climate control [3, 5].

“"We are privileged to have a living room buried in the rock that stays cool like a fridge."”

The reliance on troglodyte architecture in Trôo highlights a growing interest in passive cooling techniques. As extreme heatwaves become more frequent in Europe, traditional building methods that leverage natural geological insulation may offer a scalable, low-carbon alternative to the increasing energy demands of mechanical air conditioning.