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As Denis mentioned, incident solar radiation can increase the temperature of your building. Add to that, interior loads (lights, people, equipment) and you will notice that your building probably needs cooling even at times when the outside temperature is lower than your cooling thermostat. Check the hours of the year that your building needs cooling and the outside temperature is lower than your cooling thermostat and compare it with the hours that your building needs cooling and the outside temperature is above your cooling thermostat. Include also the temperature difference (OA/Cooling thermostat) for each hour in the 2 scenarios and that should be your answer.