Portable air conditioners are a great alternative to window units. They're cheaper, more efficient, and easy to install. The best part about portable air conditioners is that they are portable—you can move them from room to room as needed. You can turn them on or off from any room in the house, so you don't have to suffer through the heat in the bedroom while you sleep!
You can even take your portable AC with you when you go on vacation—just plug it in at your hotel and enjoy some cool air while you're gone!