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Thread: humidity

  1. #1

    Confused humidity

    I have a 2 year old home in central florida. It is always humid (around 50 to 52 percent RH). I have measured humidity in other homes (friends and relatives) and they always measure in the very low 40's.
    It seems damp to me and setting the AC on 75 degrees is just too hot in the home.
    Do I have a problem or does this sound normal ??

  2. #2
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    Indianapolis, IN, USA
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    Seems to me low 50s in a steamy climate isn't bad. The lowest I set my IAQ for in the summer is 50% dehumidification. Don't run the fan constantly, that hurts overall humidity control.

    Be interesting to see what dash or Dan think of this.

  3. #3
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    Jan 2004
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    Bet you can guess what Teddy Bears response will be.
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  4. #4
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    May 2000
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    Indianapolis, IN, USA
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    bear says 45% But I still wouldn't lose sleep over 50%. With a TXV coil and Comfort R turned on I stayed in the low 50s. Without a dehum, might be hard to do that much less.

  5. #5
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    Jan 2004
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    I got an old A/S belt drive oil furnace. 2.5 ton Armstrong A/C.
    With a lot of playing with it, I got it to hold 48%.
    Runs longer, but feels a lot better. Barely 330 CFM per ton.

    Of course, I have to reset the blower for each season.
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  6. #6
    Join Date
    Jun 2007
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    Central, FL
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    Quote Originally Posted by cjones215 View Post
    I have a 2 year old home in central florida. It is always humid (around 50 to 52 percent RH). I have measured humidity in other homes (friends and relatives) and they always measure in the very low 40's.
    It seems damp to me and setting the AC on 75 degrees is just too hot in the home.
    Do I have a problem or does this sound normal ??
    Name/Model #'s would help big time indoor & outdoor unit.
    WARNING:IF YOU DON'T KNOW THEN DON'T DO, SO THOSE WHO KNOW WHAT YOU DIDN'T KNOW DON'T END UP UNDOING WHAT YOU DID SO IT COULD GET DONE RIGHT!

  7. #7
    Join Date
    Jul 2007
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    South Florida
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    153
    Quote Originally Posted by cjones215 View Post
    I have a 2 year old home in central florida. It is always humid (around 50 to 52 percent RH). I have measured humidity in other homes (friends and relatives) and they always measure in the very low 40's.
    It seems damp to me and setting the AC on 75 degrees is just too hot in the home.
    Do I have a problem or does this sound normal ??


    How or what are you using to get your % of humidity? Most of Central and South Florida homes should run 50% humidity and approximently 75*. Unless using a psychrometer, I would not trust those numbers you gave. Unit model and serial numbers and what is your sq footage? Do you leave inland or on the coast?
    Too Few Pro Tech's & Too Many Parts Changer's.

  8. #8
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    Mar 2008
    Location
    dalton ga
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    39
    i could go into a 1000 word page about hum. but bottom line- the lower the hum. the more comf. you feel in the sumertime. 75 is cool. 70 is hot and sticky. 75 with hi hum. is hot and sticky

  9. #9
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    Mar 2008
    Location
    dalton ga
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    i am curious how fan on all the time hurts hum. in homes. fan on is allways good. cost a little more but the benefits are worth it

  10. #10
    Join Date
    Mar 2008
    Location
    dalton ga
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    it seems to me your a/c is oversized. it has to run long enough to take out the hum. if its oversized you will get 70 deg.70 PER. hum. way to high., cool but hot. your sweat is your bodys a/c sys. sweat evaps. off youe skin to cause a cooling effect. the air will only hold so much water.IF YOU HAVE 10 PER. HUM. THE MOISTER EVAPS. OFF YOUR SKIN FAST-COOLING YOU. IF YOU HAVE 90 PER.HUM.THE MOISTER EVAPS. SLOW BECAUSE THE AIR ONLY HOLDS 100 PER HUM. THE SOLWER THE EVAP,THE WARMER YOU FEEL. THATS WHY WE ADD HUM. IN THE WINTER. YOU CAN FEEL GREAT IN THE WINTER AT 68DG. -60 PERCENT HUM. OR COLD AT 75 DEG. 40 PERCENT HUM.

  11. #11
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    Mar 2008
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    dalton ga
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    You Did Not Give Your Sq. Footage Verses A/c Tonage. It Can Be Fixed

  12. #12
    Join Date
    Jul 2007
    Location
    South Florida
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    Quote Originally Posted by NGHTYRTE View Post
    i am curious how fan on all the time hurts hum. in homes. fan on is allways good. cost a little more but the benefits are worth it
    Fan on will cause any moisture left on coil and in drain pan to evaperate back into the air. The smaller the sq ft, the more of an issue it can be. It's not an issue usually, if you don't allready have humidity issues.
    Too Few Pro Tech's & Too Many Parts Changer's.

  13. #13
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    Office and warehouse in both Crystal River & New Port Richey ,FL
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    Model numbers and what is being used to measure the humidity.

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