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  1. #1
    Join Date
    Jun 2005
    I have two identical Carrier air conditioning units, one for the bottom two floors of my house, and one in the attic for the upper floor. The humidity on the lower two floors is 48%. The humidity on the upper floor is 68%. A service tech has looked at our A/C unit and pronounced it working. But the upstairs is sooooo humid, I can't believe there isn't something wrong. Has anyone else had this problem? Is it the A/C unit? Is there anything I can do to fix it? I shouldn't have to run a dehumidifier *and* and A/C unit at the same time. Any help would be appreciated. Thanks. --Ed.

  2. #2
    Join Date
    Feb 2004
    chicago suburbs
    ask your tech if slowing down the blower is feasable.

  3. #3
    Join Date
    May 2004
    can you set your upstairs stat to a lower temp than the downstairs stat, forcing it to run longer? upstairs unit may be short cycling if it has less air to cool, thus just cooling the air and not geting humidity down

  4. #4
    Join Date
    Jan 2004
    Lancaster PA
    Check for air leaks in the duct system.

    It may also be that it is over sized, and your stuck with that condition till you get a proper sized unit installed.

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    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Nov 2004
    SW FL

    Frown True Service

    Originally posted by edpowell
    The humidity on the upper floor is 68%. ... But the upstairs is sooooo humid, I can't believe there isn't something wrong.
    When's the last time the coil in the upstairs Air Handler was CLEANED?

    Check coil differential temperature and total air flow before & after cleaning.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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