1.COST EFFECTIVE CHOICE Cut down on your electricity bills with this air conditioner window seal. It blocks backflow and prevents hot air from entering your room, which is an effective and environmentally friendly solution. Besides, it is easy to install and remove, perfect for portable air conditioners. 2. and windproof: Made of reliable polyester material, this air conditioner window seal is durable and can withstand weather conditions. It prevents hot air from entering your room, and ensures that your air conditioner runs efficiently for a long time. 3.EASY INSTALLATION No drilling or other tools required. Simply place the air conditioning hose in the window frame, open the zip, tighten the zip around the hose and simply attach the window seal to the window. 4.TEMPERATURE CONTROL MADE EASY Keep your room cool in summer and warm in winter without removing the window seal. Simply open or close the window as needed. Install it again easily next summer.