This window air conditioner seal blocks drafts and saves energy by sealing gaps around your AC unit, keeping indoor temperatures stable. Effective draft blocking: seals gaps around the unit to reduce heat transfer and improve comfort in summer and winter. Broad compatibility: designed for casement and roof windows; suitable for a range of window types in home or office settings. Easy to install and remove: peel and stick application; no tools needed; simple to adjust or remove as needed. Durable and long lasting: density sponge maintains compression and seal under temperature changes for reliable performance. Practical fit: adapts to common gap sizes and fills irregular edges for a secure seal. Use scenarios Summer living room with window AC: blocks drafts and improves comfort while lowering energy use. Winter upstairs bedroom with a drafty skylight: reduces heat loss and stabilizes the room temperature. Small office with casement windows: quick retrofit to boost energy efficiency and reduce outside noise.