When you first set up a portable air conditioner, it is generally recommended to let it sit upright and unplugged for at least 2-4 hours before turning it on. This is to allow any refrigerant that may have settled during transportation to settle back into the compressor properly. Letting it sit ensures that the air conditioner operates efficiently and effectively once it's turned on.
During transportation or storage, the unit may be tilted or moved around, causing the refrigerant to move away from its designated location. Allowing the air conditioner to sit upright helps the refrigerant stabilize and prevents potential damage to the compressor when the unit starts running.
Always follow the manufacturer's instructions and guidelines specific to your portable air conditioner model, as the recommended waiting time may vary slightly depending on the unit's design and specifications. The waiting time is crucial for the optimal performance and longevity of your portable air conditioner.