Window air conditioners are available in candy bar format; compressor, fans, heat exchangers (evaporator and condenser) compactly accommodated in a single housing, because of this, this type of air conditioners has a high level of noise during operation, compared to more expensive systems split. But for the installation of window air conditioners do not require special tools and knowledge. Usually "window air" is set in the window - transom windows, reworked frame (hence its name), or specially made for him an opening in the wall.