Unlike window a/c units, portable air conditioners roll easily from room to room and are quick to set up, with no labor-intensive mounting and very few tools required. Most just require a nearby window and wall outlet to get cold air flowing. While they’re a bit more expensive than window units, you can’t beat the convenience their portability adds—plus your view isn’t blocked by a giant metal box. Portable air conditioners have an internal fan that moves hot, humid air over a refrigerant-gas-filled coil to cool and expel it into a room to lower the temperature. To find the best portable air conditioners to recommend, we tested units from trusted brands like LG, GE, Black + Decker, Midea, and more.