Keeps cool air inside: The whole point of air conditioners is to cool the air. This window seal for portable air conditioners keeps cool air inside your room by efficiently venting hot air out of the window. Your air conditioner cools your room faster and more cheaply. The window vent kit also prevents flying insects and spiders from entering the room through windows or door seams. Convenient and economical: Made of durable, waterproof material. Simply zip it between the window and the window frame to regulate airflow effectively and keep out dust and rain. You can open or close the window at any time without removing the window seal. You can also remove it and reinstall it next summer to save money. New Design: A major upgrade to our air conditioner seals. Instead of other zippered seals, our products are designed with adjustable couplers featuring two coupler openings and a single opening, providing a better seal and less air convection. Save electricity on hot summer days and save