Heat Block: Efficiently blocks drafts by sealing gaps around window air conditioners, reducing energy consumption and helping maintain stable indoor temperatures for comfortable living or working spaces. Broad Compatibility: Fits casement and roof windows; adapts to different window designs to address varied requirements in homes and workplaces. Easy Installation: Peelandstick design enables quick, tool installation and removal; convenient for renters and DIY setups. Long Lasting: Made with density sponge for durable performance and reliable sealing in temperature fluctuations. Use scenarios: Winter in a drafty apartment: blocks cold air from a window air conditioner, improves comfort, and lowers heating costs. Homes or offices with mixed window types: provides a single sealing solution for casement and skylight openings. Seasonal cleaning or window changes: easy removal and repositioning without tools for flexible use.