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  1. #1

    Central Air feels cool at first

    My central air feels cool when I first enter the room but after 15 mins, it feels sticky and warmer. I'm sure my system is undersized because the previous owner added on to the house and left the 2 1/2 ton unit. Plus it's been close to 100 for many days in a row here in Indiana, so the unit never stops running.
    Would a floor model dehumidifier help this?

  2. #2
    Join Date
    Mar 2011
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    Manchester NH
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    208
    Call a pro. A dehumidifier would probably help, but thats not going to solve the underlying problem.

  3. #3
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    Nov 2006
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    Southeastern Pa
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    Op:

    Future posts from you belong in AOP Residential.
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    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  4. #4
    Ohh.. This is one of Those forums... C-ya !!

  5. #5
    Join Date
    Dec 2008
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    Quote Originally Posted by BillinIndiana View Post
    Ohh.. This is one of Those forums... C-ya !!
    Bye bye


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  6. #6
    Join Date
    Jul 2007
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    Mount Airy, MD
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    Thread is relocated to the AOP should you return and wish to ask further questions......


  7. #7
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    Nov 2006
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    Quote Originally Posted by BillinIndiana View Post
    Ohh.. This is one of Those forums... C-ya !!
    As an old church lady once said about her no-good son in law...

    "Don't let the door hit ya where the good lord split ya."
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  8. #8
    Join Date
    Sep 2008
    Location
    Western PA
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    Quote Originally Posted by BillinIndiana View Post
    My central air feels cool when I first enter the room but after 15 mins, it feels sticky and warmer. I'm sure my system is undersized because the previous owner added on to the house and left the 2 1/2 ton unit. Plus it's been close to 100 for many days in a row here in Indiana, so the unit never stops running.
    Would a floor model dehumidifier help this?
    Now, let's look at this objectively.

    Your design temp is probably around 95, so the unit should run constantly under those conditions.

    The symptoms that you describe don't really match your diagnosis.

    An undersized unit tends to run a lot and remove more humidity than an oversized one, so being warm and sticky aren't exactly a match for an undersized system.


    I'd start with having the unit professionally serviced by a reputabe contractor to verify that the unit is working as well as it can.

    If, after that, the unit doesn't provide the comfort that you want, start by sealing the envelope of your home. Insulation, weather sealing and the like can go a long way to increasing your comfort AND decreasing your electric bills.

  9. #9
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,894

    Check All the causative Factors 'before' you Condemn Unit as being too small

    Quote Originally Posted by BillinIndiana View Post
    My central air feels cool when I first enter the room but after 15 mins, it feels sticky and warmer.
    I'm sure my system is undersized because the previous owner added on to the house and left the 2 1/2 ton unit.
    Plus it's been close to 100 for many days in a row here in Indiana, so the unit never stops running.
    Would a floor model dehumidifier help this?
    You always have to examine all the the factors that can cause the comfort problem you describe; however, it well may NOT be an undersized 2.5-Ton system.

    There are many things that can cause the sticky too much humidity situation.

    Well, near 100-F outdoor air can hold a lot of moisture grains of moisture, therefore a blower door test might be in order. In fact try to find a way to get a complete Home Energy Efficiency Audit.

    The duct system needs to be checked for proper sizing & Return air leaks from that hot attic or garage area.

    I could make a 'long list of things' that can cause the humidity to be too high in your home at any temp between 70 to 80-F.

    However, I have to type with the eraser ends of pencils, so will let other PROs list all those factors concerning the HVAC System & the home... a smaller system that runs super efficient with the longer cycle runtimes required for dehumidification, is what is needed.

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