Chillbox Portable AC Other air conditioners take up a lot of space and can be costly to run all day. Compared to conventional AC’s, Chillbox Portable AC is a low-cost, portable, efficient, and viable substitute for an electric fan. ChillBox is primarily advertised as an air cooler. However, it can function as a fan, humidifier, or air purifier. A specific filter traps allergens and dust, and the water bottle included in the package adds humidity to the air.