Window air conditioners are compact cooling units designed to fit into a window frame. They work by drawing in warm air from the room, cooling it through a refrigerant system, and then blowing the cooled air back into the space. These units are popular for their ease of installation and affordability, making them a common choice for apartments and smaller homes. Most window air conditioners come with adjustable settings, allowing users to control the temperature and fan speed. They also typically include a filter to help improve indoor air quality by trapping dust and allergens. Regular maintenance, such as cleaning the filter, is essential for optimal performance.