No, turning the thermostat up on an air conditioner will not lower your bill. In fact, it will likely increase your energy consumption and result in a higher electricity bill.
The thermostat on an air conditioner is responsible for regulating the temperature at which the unit will start and stop cooling the room. When you set the thermostat to a higher temperature, the air conditioner will have to work harder and longer to reach that higher temperature. This means the compressor and other components will be running for a longer duration, consuming more energy in the process.
If you want to lower your electricity bill while using an air conditioner, you should set the thermostat to a higher temperature, or even consider using the "energy-saving mode" if your air conditioner has one. Additionally, you can employ other energy-saving practices, such as using ceiling fans to help circulate the cooled air, keeping doors and windows closed to prevent cool air from escaping, and ensuring the air conditioner is properly maintained and cleaned. These measures can help reduce your energy consumption and lower your electricity bill.