Heat Block Seals drafts by effectively closing gaps around windows to reduce energy loss and keep indoor temperatures stable for comfortable living or working conditions. Extensive Compatibility Designed to fit casement and roof windows, accommodating multiple window styles for residential and workplace environments. Convenient to Install Peel and stick design for quick setup without professional tools. Easy removal and intuitive application with no extra equipment needed for window seal adjustments. Not Easy to Deform Constructed with high density sponge, the seal maintains its shape and function across temperature changes, delivering steady performance for window air conditioner setups. Key benefits - Improves energy efficiency by reducing drafts around windows - Reliable seal that withstands temperature variations - Flexible compatibility with casement and roof windows - Simple, tool free installation and removal Material and performance - Core material: high density sponge - Durable and stable seal for ongoing use around window air conditioner configurations Use scenarios - Home with casement windows in winter: install to block cold drafts, helping maintain a comfortable indoor environment and reducing heating load - Office space with roof windows: apply to minimize drafts and regulate room temperature more effectively - Window air conditioner setup: seal around the unit to prevent air leakage and improve cooling performance without extra tools or adjustments