This window air conditioner seal improves energy efficiency and comfort by preventing drafts and stabilizing indoor temperature. Its durable design helps you save on cooling and heating costs without sacrificing performance. sealing performance: density sponge creates a tight seal to block air leakage and reduce energy use. Broad compatibility: designed for casement and roof windows, suitable for a range of home and office window types. Easy installation: peelandstick backing enables quick, tool setup without professional help. Durable and temperature resistant: built to withstand daily temperature changes for longlasting performance. Size and material: fits most standard casement and roof window openings with a reliable density sponge core. Practical use scenarios: In a living room with a window air conditioner in a casement window, it reduces drafts and lowers cooling costs. In an office with a skylight, it helps maintain comfort by minimizing heat gain or loss. In rental spaces, it provides a removable, noninvasive seal to improve comfort without permanent modifications.