The success of these instructions depend on the type of AC unit you may have in your room. These instructions may not apply to your unit but give it a try and see...
To adjust the temperature, follow these instructions: On the thermostat, push the power button and the down arrow (button that adjusts the temp) at the exact same time. If you do this correctly, you will see the letters "bp" where the temp normally shows. You are now bypassing the sensors in the room. You can then set the temp to whatever you want and it keeps the room that cold whether you are in it or not. You might have to do this once a day as the thermostat tends to go back to sensor mode after 24 hours.
~NM