Heatwave: This forgotten solution cools your home at a lower cost
Blackout the windows
More broadly, ventilation , “often neglected, allows, thanks to controlled airflow in the home, for the regulation of air humidity and true comfort throughout the year ,” assures Little Worker. So make sure your mechanical ventilation system (MVHR) is working! Another simple measure for staying cool if you’re about to move in is “eco-design .” This simply means being careful not to place your bedroom in a room facing due south. Never mind the view of the garden! Don’t skip the curtains either, even if it’s currently more fashionable to show off bare windows: ” Blackout curtains trap heat between the curtain and the glass,” the startup reminds us. Blackout curtains also apply to the exterior: Hello Watt, also specializing in energy-efficient renovations, “systematically” offers its clients the installation of shutters.
Regarding the windows themselves, “opting for double glazing is beneficial for maintaining indoor temperatures, both in summer and winter ,” Little Worker reminds us. Admittedly, this is a more expensive undertaking, perhaps best considered for the summer of 2026. The same goes for wall and roof insulation, which is nevertheless “crucial for keeping your home cool during the summer ,” the startup emphasizes.
