Heat Block Seals gaps to block drafts, reducing energy use and helping indoor temperatures stay stable for comfortable living conditions. Broad Compatibility Suitable for casement or roof windows and designed to fit different window designs, providing a practical solution for homes and workplaces with varied requirements. Easy Installation Peel-and-stick design allows quick installation and easy removal without the need for professional tools, offering convenient adaptability. Long Lasting Made with high-density sponge for durable sealing performance, maintaining effectiveness even as outdoor temperatures change. Use scenarios - Winter warmth: Install around a window air conditioner in a casement window to reduce drafts and heat loss, improving room comfort and heating efficiency. - Summer cooling: Seal gaps around window AC units to enhance cooling efficiency in homes or offices with different window types. - Seasonal or temporary spaces: Easy to apply and remove in apartments, dorms, or offices when weatherproofing is needed for a season or temporary setup.