The recommended amount of time to let an air conditioner sit before turning it on can vary depending on the specific circumstances. However, in general, it is advisable to allow an air conditioner to sit for at least 5 to 10 minutes before turning it on. This brief pause allows the pressures in the system to equalize and stabilizes the system's operation, which can help prevent potential issues like a compressor overload or excessive strain on the unit.
Additionally, if the air conditioner has been transported or stored horizontally or at an angle, it is recommended to let it sit upright for a minimum of 24 hours before turning it on. This waiting period ensures that any refrigerant or oil that may have settled in the compressor or other components has had enough time to flow back to their intended positions.
Remember to consult the manufacturer's instructions or user manual for your specific air conditioner model for the most accurate guidance regarding the recommended resting time before operation.