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    cobia13's Avatar
    cobia13 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 5, 2007, 04:57 PM
    a/c return ducts
    Is there any rule of thumb about the size of a a/c return duct? I cannot get my house below 78 degrees when it is 90+ outside. Even when the house gets to 75 the thermostat will not turn off the unit. I have to dial in a higher number (78).

    Thks

    cobia13
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 5, 2007, 05:51 PM
    ((I cannot get my house below 78 degrees when it is 90+))

    First check the air filter to make sure it is clean.

    ((even when the house gets to 75 the thermostat will not turn off the unit. I have to dial in a higher number (78).))

    Sounds like your thermostat is out of calibration.

    ((is there any rule of thumb about the size of a a/c return duct?))

    Yes there is but it is definitely not the way to correctly calculate the proper size.
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