On behalf of the Fondation Mansart, Valentin is managing a project to upgrade three historical buildings in the Parc de Bagatelle in western Paris to geothermal systems, which will reduce their CO2 emissions by 90%.
The Château de Bagatelle, Villa Windsor and Villa Amélia in the Bois de Boulogne are benefitting from an ambitious energy transition project undertaken by the Fondation Mansart. Having previously been heated using fuel oil, these historical buildings are now equipped with modern geothermal systems designed and installed by Valentin (VINCI Energies Building Solutions) under a skills sponsorship programme funded by the Group.
“We were able to offer a comprehensive, discreet solution with respect for each building’s heritage.”
“We replaced the old CO2‑emitting systems with one that provides heating and climate control with a 90% reduction in greenhouse gas emissions,” says Pascal Claisse, Business Unit Manager at Valentin. This was essential, since these spaces will soon be hosting exhibitions and events that require thermal comfort all year round.
Combining heritage and sustainability
Each site is now equipped with a 156 kW heat pump fed by inclined geothermal probes, which were incorporated into the buildings without visible modifications. The challenge lay in adapting these technical installations to the cramped available spaces while preserving the architectural integrity of the buildings.
“We had to completely dismantle and reassemble some of the heat pumps and break the buffer tanks down into several pieces to get them through the narrow access points,” explains Pascal Claisse. “We were able to offer a comprehensive, discreet solution with respect for each building’s heritage.” This work, which began in 2024 and was successfully completed in July 2025, amply illustrates the interaction between technical innovation and heritage preservation.
09/29/2025
