Controls: Some portable air conditioners have programmable digital controls and thermostats while others have simpler manual controls. You can also find units with remote controls. Programmable digital controls provide the most hands-free operation, but they tend to wear out quicker than manual controls.
Louvers: Portable air conditioners with oscillating louvers or a multi-directional air flow will distribute cool air more evenly throughout the room.
Energy Efficiency: Portable AC units should have an energy efficiency rating (EER). The higher the rating, the more energy efficient the unit.
Casters and Handles: If you’re going to be moving your portable air conditioner around, choose one with casters and easy-grip handles.
Noise Level: All portable AC units make noise, but some are louder than others. Depending on your intended use for the unit, you may be able to tolerate more or less noise.