The French government has made the installation of shutters and reversible heat pumps a top priority to reduce the number of homes that act like "thermal boilers" during the summer. This initiative aims to improve summer comfort, which has become a growing concern as climate change leads to more frequent and intense heatwaves. The summer of 2026 highlighted the problem, with many homes, both old and new, experiencing indoor temperatures of 30 to 35 degrees Celsius. According to a study by the industrial alliance Ignes, published in June, over 40% of homes lack shutters on all windows exposed to sunlight, contributing to overheating. Vincent Jeanbrun, the Minister of Housing, stated on September 25 that achieving summer comfort is less straightforward than energy renovation. He pointed out that the DPE, a rating used to assess a home's energy efficiency, should be re-evaluated to include summer comfort factors. Even homes rated A, which are considered energy-efficient, can become heat sources during heatwaves. Jeanbrun emphasized that addressing the lack of shutters would be a major first step in improving comfort. He also plans to form working groups with the Ministry of Ecological Transition to develop a "nutriscore"-style rating system for summer comfort. These changes are also being considered in the housing bill, which is expected to be reviewed for a second time no later than mid-November in the National Assembly. The bill supports making the Architectural Advisory of France a consultative body only for the installation of shutters and reversible heat pumps. Similar changes apply to major energy renovation projects in co-ownership buildings, which often require work on the exterior facade. The ministry also wants to change the voting requirements for such projects, allowing a simple majority instead of an absolute majority, which could help reduce delays and conflicts. The Minister of Housing also plans to strengthen an existing program called the collective loan with automatic subscription, introduced in the 2024 law on degraded housing. This allows co-ownership syndicates to take out loans, with the community bearing the risk rather than individual property owners. However, the program is currently not well-supported legally or widely available. Banks have expressed concerns about the lack of reliable tools to assess risks, particularly because property owners can refuse the loan within two months, affecting the loan amount. These issues will be addressed during the upcoming legislative session. Another amendment, proposed by deputy François Jolivet from the Horizons party, seeks to promote a "collective DPE" calculated at the building level, potentially replacing individual DPE ratings. This amendment is expected to be debated no later than the week of November 16, or earlier if a new time slot becomes available.