Key benefits Reduces cooling energy use and associated carbon emissions by preventing hot air from entering around a portable air conditioner. Improves airconditioning efficiency and indoor comfort by creating a reliable seal at the window opening. Quick, nonpermanent solution that works for homeowners and renters who need effective cooling without remodeling. What it is and how it works Portable air conditioning window set designed to seal the gap around portable AC exhaust hoses and windows. Crafted from polyester for a lightweight, flexible seal that adapts to window gaps and contours. Adjustable design fits various window types, including sliding and casement windows, to block incoming hot air and reduce conditionedair loss. Performance and compatibility Compatible with most portable air conditioners that vent through a window opening; the adjustable fit accommodates different window heights and configurations. By reducing the amount of outside hot air entering, the set helps the AC unit maintain temperature with less runtime, improving comfort and lowering energy use. Durable polyester construction provides a practical, reusable sealing solution suitable for temporary or seasonal installation. Practical features Supports easy, renterfriendly installation without permanent alterations to windows. Designed for homeowners seeking better HVAC efficiency and renters needing a fast, effective window seal for portable units. Offers a straightforward way to improve indoor comfort and reduce cooling costs. Use scenarios Apartment bedroom: install the window set around the portable AC exhaust to stop hot air infiltration and keep the room cooler throughout the night. Living room or den in a house with sliding or casement windows: create a tighter seal around the AC vent to reduce runtime and lower utility bills during hot months. Temporary or seasonal use (garage, workshop, shortterm rental): deploy the adjustable polyester seal when a portable AC is needed, then remove and store when not in use. What you get An environmentally conscious, practical window sealing solution that enhances portable air conditioner performance while aligning with energysaving goals. A flexible, adjustable polyester set designed to fit multiple window types and deliver a measurable reduction in hotair infiltration.