Every time the power flickers the AC unit stops blowing cold air. The last time it happened the repairman reset the thermostat by pushing 2 buttons on the thermostat and then going through the setting on the screen. I would really like to know how to do this with out having to call him every time...

The buttons he is pushing is to bypass the 5 minute time delay on the thermostat after power has been lost to the system. Nothing to do with resetting or repairs. Its only to expedite trouble shooting.