Energy renovation audits reveal risks of increased summer heat

An analysis of approximately 700,000 energy audits published by Ademe reveals that one-third of recommended renovation scenarios may increase indoor temperatures during summer months. The study, conducted by the platform Argile.ai, indicates that 31% of recommended works lead to higher indoor heat, with 26.5% of cases seeing a rise between 1 and 5 °C, and 4% exceeding 5 °C.

The findings suggest that renovations focused primarily on winter heating efficiency often fail to account for building inertia, solar exposure, and ventilation. Specifically, insulating floors can disconnect a home from the natural cooling effect of the ground, with 61% of such projects worsening summer comfort. Interior wall insulation can also reduce the regulating thermal mass of existing structures.

In response to energy transition needs, the France Rénov’ national tour is visiting Grasse on October 2 and 3, 2026. Organized by the National Housing Agency (Anah), this mobile initiative provides citizens with free, independent advice on energy efficiency and home adaptation. The program aims to help residents navigate state financial aid, such as MaPrimeRénov’, while preventing fraud and supporting the modernization of aging housing stocks.