1. Keeps the cool air in: The window seal set for portable air conditioners effectively blocks hot air from entering while retaining cool air inside your room. This allows your air conditioner to cool the space faster and more efficiently! The vent kit also prevents insects and spiders from entering through window or door gaps. 2. Energy saving: This window seal set helps lower energy consumption and reduces carbon emissions, which spike during summer due to heavy AC usage. The window kit is an solution to cut electricity costs and support environmental protection. 3. Practical and economical: Made of durable, waterproof material, it easily zips between the window and frame to regulate airflow while keeping out dust and rain. You can open or close the window anytime without removing the seal. 4. Compatibility: Designed for frequently used tilt windows or sashes, including leftopening, rightopening, or bottomhung windows and skylights (not suitable for sliding windows or doors).