Portable air conditioners are generally more suited for cooling smaller spaces or single rooms. They are not typically designed for large spaces or whole-home cooling due to their limited cooling capacity. While portable units offer the convenience of mobility and easy installation, they may not be as energy-efficient as other types of air conditioners when used in larger areas. For larger spaces, a central air conditioner or a ductless mini-split system would be more efficient and effective. However, for individuals living in smaller apartments, renting their living space, or looking to cool a specific area temporarily, portable air conditioners can be an excellent choice.