A:Answer I love my Frigidaire unit. But, DO NOT use Economy mode. Keep the unit set to cool so that the fan runs all the time when the unit is on. I had to replace another air conditioner because of black mold before I learned about the danger of using Economy mode. Economy mode is a feature that the US Government now requires on air conditioners. Economy mode stops the fan when the room reaches the desired temperature to save electricity. Stopping the fan causes condensation to form on the very cold coils which promotes the growth of mold. When the unit cycles back on, the moisture and mold is blown into the room and throughout your house. Economy mode may save you a few dollars on your electric bill but it is not worth the danger to your health.