No more intrusive hot air - window seals trap hot air from your portable air conditioner hose, trapping it between the window frame and the window itself. Our window seals keep unwanted guests and rain out and provide a "closed environment" that helps keep your room cooler for longer. Improved cooling performance - Enjoy a cool environment in summer ! Our products seal window edges even when they are open. It wraps around the air conditioner's air duct and blocks hot air return, allowing your portable air conditioner to cool your room more efficiently and quickly. Reduced energy consumption - This window seal helps to reduce energy consumption and CO2 emissions, which is particularly important in summer due to intensive use of air conditioning. By preventing hot air from circulating in your room, window seals save you money on your electricity bills! Easy to install - no drilling required. Everything you need comes with your window seal! Simply apply the tape inside the window frame and to the window. Attach the caulking fabric to the tape. Then, unzip the zipper and route the air conditioner hose through the window. Finally, close and tighten the zipper around the pipe. It's so simple. Universal - Works with all portable air conditioners and dryers, regardless of manufacturer. Whether it's a window that opens left or right, a tilting window or a skylight, window seals will do the trick. This product is suitable for windows with a maximum circumference of 400 cm.