Never use an extension cord for window ACs. You’ll also need an electrical outlet that accepts three-prong plugs fairly close to the window most window units have a cord only about six feet long. Sliding windows that move from side to side, and casement windows that tilt outwards to open, aren’t options for these air conditioners. Almost all such appliances are designed for a double-hung window, meaning there is a fixed upper pane and a lower pane that slides up and down. Not every window is suited for an air conditioner. Some complexes don’t allow window ACs for aesthetic reasons (they’re not the most attractive additions to a building’s exterior) or because an improperly installed unit could fall from the window, creating a safety hazard. While most single-family homeowners are free to install a window AC, if you live in an apartment, condo complex, or a neighborhood with a homeowners’ association, check with management or the HOA board before investing in a unit.

DON’T assume you’re permitted to install a window unit.

Flats for windows instal free