Most inexpensive, digital black 5000BTU AC with a remote I could find for my 150 sq ft bedroom. My mobile home has old windows, but there was no issue with installation (other than strengthening the windowsill). It does put a little bit of pressure on the window, but my single-pain 35 year old window can hold it fine without additional supports. The AC has some nice features: the remote, a delay setting to have the AC turned on before you get home, multiple operating settings. It runs quietly and doesn't make any unusual sounds. However, the front plastic grill can sometimes make an annoying vibrating sound, but pulling the air filter screen out about a quarter inch eliminates that problem.