NO MORE HOT AIR COMING IN - the window seal keeps out hot air from your portable air conditioner hose by locking the hose between the window frame and the window itself. Our window seal keeps out unwanted guests, rain and creates a "closed environment" that keeps your room cooler for longer INCREASE COOLING PERFORMANCE - it seals around your open window and then passes around the nozzle of your hose to prevent the flow of hot air, so your mobile air conditioning unit can be more efficient and cool your room faster REDUCE ENERGY CONSUMPTION - this window seal helps reduce energy consumption and carbon dioxide emissions, which are particularly high in the summer months due to the intensive use of air conditioning. By preventing hot air from circulating in your room, the window seal helps you save on your energy bills EASY TO INSTALL - NO NEED TO DRILL HOLES. No need to buy window kits, adapters for your hose, or additional tools. Everything you need comes with your Window Seal! Simply apply the adhesive hook tape to the inside of your window frame and the window itself. Attach the window seal to the hook tape. Then, open the zipper on the window seal and place your air conditioning hose out of the window. Finally, close the zipper tightly around the hose. It's as simple as it gets. .UNIVERSAL - Suitable for all portable air conditioners and clothes dryers, regardless of manufacturer. Whether it's left-opening windows, right-opening windows, bottom-hung windows, or skylights, the Window Seal will do the job. Fits windows with a maximum circumference of 500CM