This window seal helps prevent air leaks around casement and roof window air conditioners, improving comfort and energy efficiency. sealing: advanced sealing technology reduces air leaks, stabilizes indoor climate, and helps lower energy use. Broad compatibility: designed for casement and roof window air conditioners, suitable for homes and offices. Easy to install and reposition: peelandstick design requires no tools; simple to install, adjust, or remove. Durable and temperature resistant: density sponge preserves a tight seal across temperature changes for longlasting performance. Flexible fit: adapts to common window gaps to seal a range of unit widths. Practical uses: In an apartment with a drafty casement window AC, it reduces drafts and improves comfort. In a home office with a window unit, it helps maintain steady temperatures and enhances cooling efficiency. In rental properties with seasonal window units, it's easy to remove for storage and reapply when needed.