The French Institute for Building Performance (Ifpeb) has estimated that between 46 and 53 billion euros will be needed by 2050 to adapt homes in France to rising temperatures, excluding the cost of air conditioning. These adaptations would focus on "passive solutions" such as installing external sun protection, ceiling fans, and roof insulation. Studies by the Scientific and Technical Building Center (CSTB) and the collective "Our Cities at 50°C" suggest that implementing these three basic measures could make about 70% of homes livable under high temperatures. However, the Ifpeb clarifies that this investment will not be fully funded by the state; property owners will need to contribute as well. Christophe Rodriguez, director of the Ifpeb, emphasized in a statement that the focus should not be on bureaucratic processes but on taking action. He said that many of the necessary measures are already known and that the housing stock is ready for adaptation. To begin, the Ifpeb plans to target the adaptation of one million homes starting in 2027, which would require an investment of 3.5 to 4 billion euros. These efforts will focus on the most vulnerable areas and households. From 2028, the institute plans to adjust support based on income and property ownership status, using existing programs like MaPrimeRénov', a government subsidy for energy renovation, and energy savings certificates (CEE) funded by energy companies. The Ifpeb estimates that 6.5 million homes are located in areas most at risk of high temperatures and must be adapted within five years. Another 5.3 million homes, also exposed to high temperatures, would need adaptation within 10 to 15 years. The plan does not include the installation of air conditioning, but the Ifpeb acknowledges that in areas where warm nights prevent natural cooling, air conditioning may become necessary for maintaining habitability. The Institute for Climate Economics (I4CE) suggests that about 10 billion euros per year will be needed to accelerate adaptation across sectors like schools, hospitals, housing, and transport in France. For housing specifically, I4CE has adopted a figure from the Foundation for the Housing of the Disadvantaged, which estimates a cost of 48 billion euros by 2040, or 3.2 billion euros per year, for installing shutters and air circulators. The Social Housing Union estimates that equipping social housing with these features would cost 8.6 billion euros.