NO HOT AIR COMING THROUGH YOUR DOOR – the door seal is a unique seal that keeps out hot air from your portable air conditioner hose by locking the hose between the door frame and the door itself. Our door seal creates a "closed environment" that keeps your room cooler for longer. INCREASE COOLING PERFORMANCE – Enjoy a cooler environment in the summer thanks to the seals around your open door and then around the opening of your hose, preventing the flow of hot air, so your mobile air conditioning unit can be more efficient and cool your room faster. REDUCE ENERGY CONSUMPTION – This door seal helps reduce the increased energy consumption and carbon dioxide emissions into the atmosphere due to the overuse of air conditioners, especially in the summer months. EASY TO INSTALL – NO NEED TO DRILL HOLES. Everything you need comes with your Door Seal! Simply apply the adhesive hook tape to the inside of your door frame and the door itself. Attach the door seal to the hook tape. Then, open the zipper on the door seal and place your air conditioning hose outside the door. Finally, close the zipper tightly around the hose. It's as simple as it gets. UNIVERSAL & EASY TO USE - Suitable for all portable air conditioners and clothes dryers. For left-hand or right-hand doors. Fits doors with a maximum perimeter of 36x83 inches.