This summer, France faced a series of intense heatwaves that challenged both natural life and man-made structures, prompting project owners to rethink ongoing construction efforts. The weather was unusually hot and dry, sparking conversations about adapting building designs to better handle extreme temperatures. New regulations, such as the RE2020 standards, now include provisions for summer comfort, but older rules, like RT2012, were primarily focused on energy efficiency due to the oil crises of the 1970s. Many buildings constructed in the 1950s or between 2000 and 2010 lack proper insulation or thermal mass, which makes them less able to retain or resist heat. As a result, project owners are now evaluating how well these structures can withstand rising temperatures, considering future climate models for the years 2050 and 2070. However, the accuracy of these long-term predictions is uncertain, with some experts suggesting that immediate concerns should take priority over distant forecasts. Deciding to revise construction projects is complicated by the cost and practicality of making necessary changes. Architects and project owners must balance the financial burden of modifications against the possible need for future renovations. The use of air conditioning is also being questioned, especially in buildings that are not heavily occupied during the summer months, due to the high costs of installation and ongoing maintenance. Current climate worries have created uncertainty among decision-makers, who are reluctant to proceed with projects because of the unpredictability of future climate conditions. While the RE2020 regulations aim to improve summer comfort, the challenge remains in achieving this without harming the economic feasibility of projects. This situation highlights the tension between taking a cautious approach to potential risks and effectively managing construction projects in the present.