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  1. #1
    Join Date
    Jun 2008
    Posts
    13

    new a/c not dehumidifying

    I just had a American Standard heat pump/ a/c installed thats blowing cool but humid air and cannot get humidity under 55 % in the house so its cold and clammy inside and even have some condensation on windows. Did installer undersize the unit?

  2. #2
    Join Date
    Mar 2004
    Location
    Illinois
    Posts
    6,959
    Call'm back. Make sure they have set the unit up properly...it can be adjusted to remove more humidity.

  3. #3
    Join Date
    Jun 2008
    Posts
    13
    Do they do that by lowering blower speed?

  4. #4
    Join Date
    Aug 2004
    Location
    Minnesota
    Posts
    349
    If your fan is on "ON" try setting it on "Auto". I reduced my home's humidity today from 54% to 42% just by making that change.
    White Bear Township, Minnesota
    www.summitheating.com

  5. #5
    Join Date
    Jun 2008
    Posts
    13
    Thermostat fan setting is on auto all the time. Not much water coming out of the condesate drain

  6. #6
    I would guess fan speed isnt right

  7. #7
    Join Date
    Jun 2008
    Posts
    13
    Blower speed is very high, air has never come out of my vents so high, would lowering blower speed help remove more moisture?

  8. #8
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,302
    Quote Originally Posted by upmike View Post
    Blower speed is very high, air has never come out of my vents so high, would lowering blower speed help remove more moisture?
    Yes, but any air speed changes should be handled by a pro.

  9. #9
    Join Date
    May 2008
    Posts
    21
    we had the same problem whit our new Trane. The air coming out of the vent sounded like a storm outside so hard. The house cooled faster but not time to reduce humidity. Tech came and reduced speed to Medium. It is a variable speed air handler. It solved the problem. Or thermostat tries to reduce humidity by lowering temp by up to 3 degree below setting. This can make it cold sometime.

  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,139
    lowering the speed will slow air movement across the coil allowing for better
    dehumidification...

    call them back.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,778
    Call them back, and have them check system operation, not just slow the blower.
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    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    Quote Originally Posted by beenthere View Post
    Call them back, and have them check system operation, not just slow the blower.
    beenthere is exactly right.

    Don't have them just lower blower speed. Have them do a complete system check. The problem is more than likely the blower is set too high but there are other things that could cause high humidity.
    I fully support the military and the War on Terrorism.


    If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.

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  13. #13
    Join Date
    Jun 2008
    Posts
    13
    The owner just left and checked temps from return and supply and drop was only 17 deg. and also agreed it was humid. He's coming back this week to try and get temperature difference higher and lower blower speed and hopefully that helps. I'm really missing my 12 year old Rheem that kept the inside a nice comfy 35%-40% humidity plus you could set temp. higher with lower humidity

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