No more hot air revenue Window sealing prevents warm air from portable air conditioning hoses from entering by locking the hose between the window frame and the window itself. Our window seals prevent uninvited guests, rain and crates from creating an "enclosed environment" that keeps your room cool for longer Improved cooling performance Sealing cloth seals around your open windows, then tightens the hose's nozzle and stops the backflow of warm air, so your mobile air conditioning unit can be more efficient and cool your room in less time Reduced energy consumption This window sealer helps to reduce energy consumption and lower CO2 emissions, which are especially high in the summer months due to the heavy use of air conditioners. Window seals prevent warm air from circulating in the room, helping you save money on your electricity bill Easy to install no drilling required. You don't have to buy window kits, hose adapters, or other tools. Simply attach the adhesive hook strap to the inside of the window frame and to the window itself. Attach the window seals to the hook straps. Then, open the zipper on the window seal and stick the air conditioning hose out of the window. Finally, close the zipper tightly around the hose. It's as simple as that. Universal Suitable for all portable air conditioners and tumble dryers, whether it is a left-facing or right-opening window, underhung window or skylight