Can you get Leagionairs dease from a window A/C unit ?

You can get Leagionairs,, by being in the wrong place and breathing,, many places and things you can blame it on

You get it from breating moisture droplets contain the bacteria legionellae. Its only called Legionnaires disease because the first major well know outbreak was at an American Legion convention. Read this Protect Yourself from Legionnaires' Disease: The waterborne illness that continues to kill and harm