Keep your window-mounted air conditioner working reliably and protect your home from rain, moisture, and drafts with this high-density polyester air conditioner window seal. Designed for straightforward installation and long-term performance, it fits a wide range of window types and reduces moisture intrusion that can affect AC efficiency. Key benefits Waterproof protection: high-density polyester weave and a secure sealed edge barrier block rain and moisture from entering around the AC unit. Simple 3-step installation: install quickly using the included tension cord and tape kit — a straightforward process that requires no special tools. Flexible, adjustable fit: a flexible frame adapts to a wide range of window configurations and irregular gaps to create a consistent seal around the AC. Long-lasting durability: reinforced seams and dense material resist deformation over time, maintaining seal performance and supporting the AC’s efficiency. Features and materials Material: high-density polyester weave with waterproof properties. Edge protection: sealed edge barrier to prevent water ingress along seams. Installation kit: tension cord and tape kit included to secure the seal in place. Construction: reinforced seams and dense fabric for resistance to stretching or warping. Performance and compatibility Designed to provide reliable sealing for most window-mounted air conditioner installations, including single- and double-hung windows and other common window styles. Helps maintain air conditioner performance by preventing moisture, drafts, and debris from compromising the window seal. Built to withstand repeated seasonal use without significant deformation or loss of sealing ability. Practical use scenarios Apartment window AC in rainy climates: blocks rain-driven moisture from entering around the unit and keeps indoor walls and floors dry. Bedroom or living room window unit: reduces drafts and prevents outside humidity from affecting comfort and AC workload. Offices or older windows with irregular gaps: flexible frame conforms to uneven openings to create a consistent, waterproof seal. What you get Waterproof polyester seal with reinforced seams and sealed edge barrier. Tension cord and tape kit for a straightforward 3-step installation. This air conditioner window seal offers practical waterproofing, easy installation, adaptable fit, and durable construction — a dependable solution for maintaining the function and longevity of window-mounted AC units.