Portable cooling air conditioners are lightweight and efficient cooling devices suitable for various scenarios, such as indoor small spaces, outdoor camping, in-car use, and even personal wearables. These devices typically employ evaporative cooling or semiconductor technology, providing local cooling effects without requiring complex installation. For example, Honeywell's ES800 and CL152 portable evaporative coolers are suitable for small to medium-sized indoor spaces, providing naturally cool air in low humidity environments and also featuring humidification capabilities. Personal desktop air conditioners like Evapolar utilize nanomaterial evaporation technology to provide a customized comfortable environment for individuals, suitable for use on a desk or in a bedroom. For outdoor enthusiasts, portable air conditioners launched by Westinghouse and Charmix feature a design without an external unit, supporting in-car or mobile power supply, and can quickly cool down tents or vehicles. These devices typically feature low noise, energy efficiency, and environmental friendliness, making them flexible alternatives to traditional air conditioners.