Portable air conditioner can be moved from one room to another room. Portable AC uses the room air to cool the condenser and exhaust the hot air through a window or sliding door. In self-evaporating portable AC system, the water condensation is recycled back into the room air.
Split air conditioner has two parts - outdoor unit and indoor unit. Split air conditioner is energy efficient and has a soundless operation. Split AC has a rich temperature control than other air conditioner.
Window air conditioner is used for small home or office. The window AC compressor and the evaporator are in one unit.