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Should an air conditioner fan be set to auto or on?

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βˆ™ 2008-10-02 17:50:49

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This function controls the fan in the air handler which circulates the air throughout the house. It is available whether the AC or heat is being used and has no affect on those functions. When in the on position air is constantly being circulated. When set to "Auto" the fan is only engaged when the heat or AC is triggered by the thermostat. Many air handlers are in the attic where it is more humid and during the summer it is very hot. The intake vent is often found in the ceiling of the highest level where hot air rises when the AC and fan are not in use. in units where the air handler is in a closet, most all of the home's duct work is located in the attic. When the fan is set to "On" and the AC is not in use, hot air and humidity is being circulated back into the house from the attic. On temperate days when neither the AC nor heat is needed the On position can be used to help freshen the air to some degree. If you do not have good insulation installed in your attic and the air is fairly warm on sunny winter days, the On position can take some of the load off of the heater.

2008-10-02 17:50:49
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2020-09-27 19:45:41


2020-09-27 19:45:41
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