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    twatsonmd's Avatar
    twatsonmd Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 10, 2008, 08:36 AM
    Central A/C fan: "on" or "auto"?
    Is it more energy-efficient to set the central A/C fan to "auto" or "on"? What are the pro's and con's of either setting?:confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Aug 10, 2008, 09:17 AM
    Auto is best unless you have a special variable speed device that takes the motor down to 300 to 500 rpm when not heating or cooling.
    Many reasons but in ac mode the high speed movement of air when the outside unit is off just tosses the humidity back into the air that you just paid to remove.

    If you leave the blower at on it will just move the air all the time. That could promote better air circulation but at a very high cost.
    You can also do a search on this site and others for more info.
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