Portable air conditioners can be a highly effective way to either supplement an existing central HVAC system or cool a room entirely. Not only do portable AC's cool the surrounding air, they also dehumidify - keeping the air comfortably dry. The portable air conditioner units offered here differ by brand, capacity, and by additional features (such as whether a remote control is included, hose setup etc.) Some units have additional heating & IONIZER capabilities as well. Perhaps the most important thing to determine when choosing a portable air conditioner is the size (BTU) required.