“I bought this unit thinking that it didn't need to be attached to a window, but it appears it does. Does it need to be attached to a window or is it functional without?”
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The Insignia™ 350 Sq. Ft. Portable Air Conditioner does require a window for proper use. It includes an exhaust hose and window installation kit, which are necessary to vent hot air outside. Without this setup, the unit cannot cool effectively and may overheat. The kit is designed to fit most standard windows, making installation relatively straightforward. Patricia | Insignia Support
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