Using a grounded adapter alone will not make a 115V air conditioner work if the power supply in your location is not compatible with the air conditioner's voltage requirements. The voltage rating of the air conditioner is a crucial factor, and using an adapter does not change the voltage supplied to the appliance.
Air conditioners typically come in different voltage ratings, and the standard residential power supply in the United States is 120V. So, if your air conditioner is rated for 115V, it should work with the standard power supply in the U.S.
However, if you are in a region where the power supply is substantially different (e.g., 220-240V), using just a grounded adapter will not be sufficient. The grounded adapter only provides a physical connection to the ground, ensuring safety from electrical shocks, but it doesn't alter the voltage or provide voltage conversion.
If you have an air conditioner that operates on a different voltage than the power supply in your area, you would need a voltage converter or a transformer to match the voltage requirements of the air conditioner to the local power supply. It's essential to use the correct voltage converter or transformer to avoid damaging the air conditioner or other electrical issues.
To sum up, a grounded adapter alone won't help you operate an air conditioner with different voltage requirements. You need to consider the voltage compatibility and use a suitable voltage converter if needed. Always consult a qualified electrician or technician to ensure safe and proper electrical connections and avoid any potential damage to the appliance or safety hazards.