NO MORE INTRUSIVE HOT AIR - The window seal keeps hot air out of your portable air conditioner's exhaust hose by blocking it between the window frame and the window itself. Our window seal prevents unwanted guests and rain from entering and provides a "closed environment" that helps keep your room cooler for longer. BOOSTS COOLING PERFORMANCE - Enjoy a cooler environment in the summer with our window seal! Our product seals around your window even when it's open. It encircles your air conditioner's exhaust hose and blocks the return of hot air, allowing your portable air conditioner to be more efficient and cool your room faster. REDUCES ENERGY CONSUMPTION - Love the Earth! This window seal helps reduce energy consumption and carbon dioxide emissions, which is especially important in the summer due to the widespread use of air conditioners. By preventing hot air from circulating in your room, the window seal helps you save on your energy bills! AVAILABLE IN 4 SIZES - Fits all portable