The dew point sensor contributes to both HVAC energy efficiency and passenger comfort by optimizing the evaporator setpoint. By providing the HVAC with accurate dew point, temperature and humidity data, the sensor allows the HVAC system to accurately control humidity level in the cabin. Mounted in the HVAC system air intake, just before the evaporator, the SADP provides the HVAC controller with valuable data on the exact mix of outdoor and recirculated air to condition.