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Thermostat "ON" And "AUTO" Fan Buttons

Q. What's the difference between the "ON" and "AUTO" fan buttons on my thermostat?

A. In the "Auto" (automatic) position, the blower in the heating mode cycles (goes off and on) because it is controlled by the room temperature. In the "On" position the blower runs continuously 24/7.

Two additional advantages occur from "ON" position operation.

  • If you have indoor air quality products, you get a continuous flow of clean air.

  • Continuous Air Circulation (CAC) prevents the air from stratifying (warm air rising; cooler air falling) that occurs doing the "Off" cycle of a blower that is set to "AUTO".

  • One disadvantage can occur from "ON" position operation in older homes due to higher infiltration between the outside and indoor air; it can create a higher humidity level within the home.


The company You Choose To Install and Service Your System Will Determine The Degree of Comfort and Satisfaction You Enjoy.

These "Common HVAC Problems" are provided FREE and as a consequence Climatemakers does not assume any liability resulting from any information we provide. In all cases where there is any possibility of injury, consequential damage, direct damage to your equipment or when recommended by the equipment manufacturer, your system should be repaired, inspected or maintained by a qualified technician.

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