Key benefits Tool-free, damage-free installation: no drilling or tools required. Attaches to the inside of the window frame and the window with a zipper and tape for a secure, removable seal. Keeps cool air inside and hot exhaust air outside: the hose passes through the seal so the portable AC exhausts outdoors while maintaining indoor cooling efficiency. Energy and cost savings: by reducing hot air infiltration, it helps the portable air conditioner work more efficiently, lowering energy use and helping reduce CO2 emissions and electricity costs. Weather and pest protection: waterproof, durable polyester blocks wind, rain, dust and insects while controlling air exchange. How it works (simple steps) 1. Stick the window seal to the inside surface of the window frame and window. 2. Place the portable AC hose through the seal so the hose vents to the outside. 3. Tighten the zipper around the hose and secure the seal with the included tape. 4. Open or close the window as needed without removing the seal. Key features Material: durable, waterproof polyester that resists wear and helps block hot air and drafts. Function: creates a sealed gap between the window and frame for the portable AC hose, preventing hot outdoor air from entering and keeping cool air inside. Performance: improves cooling speed and efficiency by minimizing air exchange and heat gain around the exhaust opening. Convenience: removable and portable—install quickly and remove without tools or permanent modification to window frames. Practical applications Apartments and rentals: install quickly without drilling or permanent changes, ideal where modifications are not allowed. Home offices and bedrooms: improve AC performance and maintain a stable indoor temperature for comfort and productivity. Temporary cooling for events or seasonal use: set up or remove the seal as needed for portable AC use in seasonal rooms, workshops, or short-term spaces. What you get A waterproof polyester window seal designed for portable air conditioners, zipper closure for the AC exhaust hose, and adhesive tape for secure attachment. A non-permanent, reusable solution that protects indoor climate and reduces energy loss without altering windows. Notes and care Attach only to compatible window types where the seal can be secured between the window and frame. Keep the polyester material clean and dry; check the adhesive tape periodically for secure attachment.