This air conditioner window seal helps prevent hot outdoor air from entering the room, reducing power consumption and cooling costs. It blocks backflow and offers an easy, environmentally friendly solution that is simple to install. Key benefits - Windproof and durable: Made from high quality waterproof polyester to provide reliable protection against harsh weather. - Easy installation: No drilling or tools required. Place the hose, unzip the seal, tighten it, and attach it to the window frame for an airtight seal. - Year round temperature control: Keeps your space cool in summer and warm in winter without removing the seal. Open or close the window as needed and reinstall easily next season. Use scenarios - Apartment or rental window AC: stop drafts from outside and reduce energy usage. - Homes with windy or drafty windows: block backflow and stabilize indoor temperature. - Seasonal rooms or workshops: adjust climate quickly without permanent modifications.