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  1. #1
    Join Date
    Aug 2007
    Posts
    339

    Question The Ideal temperture for cooling in the home ?

    What will be considered the ideal temp. to have set for cooling comfort in your home ? I stay in oh and I was telling my customers that 74 degrees was the norm. Please correct me if I'm wrong!

    Thanks

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,638
    Forget about telling people their ideal temperature.
    Some are comfortable with 78^F with 45%RH and ceiling fan air. When the %RH is 65%, you may need <72^F. 70^F 70%RH is never comfortable to most. You will need to discuss temp, %RH, and air movement. Its a can of worms, unless you are ready to control the varibles.

    I promote low %RH for comfort and health along with fresh air during occupancy. You will need a properly set-up a/c and whole house dehumidifier to deliver during all of the varible weather conditions. This is the future.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #3
    Join Date
    Jun 2006
    Posts
    628
    Depends on you, your activity level, and local humidity. If humidity is fairly high, maybe address that first, or look at a system with a dehumidify mode. Things like ceiling fans can also raise the tolerable temperatures a bit.

    Our AC kicks in at 77 and off at 74, humidity is naturally low in our area (SoCal), but we have no ceiling fans. Cleaning house or other busy activity and I turn on fan portion of the AC, but don't change the temp setting.

  4. #4
    Join Date
    Nov 2004
    Posts
    35
    I keep my Infinity at 78 degrees, humidity at 48% and it's very comfortable.

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    What ever temp they feel comfortable at.

    I prefer 72 myself.
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  6. #6
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,376
    If only folks had a better grasp on the metric of dew point over relative humidity. When dew point levels are < 55 degrees F, the temperature of the air surrounding a person can vary fairly widely and that person still be comfortable. In my own home I maintain the dew point at around 52 degrees at 75 degrees room temperature.

    Activity levels also play a role in personal comfort levels. Go to a gym, upon walking in it may feel cold. Hit the weights or the cardio equipment for half an hour and suddenly the gym just can't be cold enough to keep you from sweating.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,598
    68

  8. #8
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
    Posts
    1,582
    68* is nice for heating, but for cooling 75* with approx. 50% RH is good for me, the house stays fairly constant during the daytime, until the early evening when the AC kicks on a few times.

  9. #9
    Join Date
    Jul 2008
    Posts
    551
    81^F @ 40%RH and a ceiling fan is good enough for my house during the days. At night it sets back to 77 degrees because the bedroom ceiling fan is too loud to run on anything but low.

  10. #10
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    Set it for what feels for them, not what feel goodto you.
    Remember, Air Conditioning begins with AIR.

  11. #11
    Join Date
    Sep 2006
    Posts
    136
    I have an IAQ. Wouldn't if be nice if I could set my thermostat for dew point instead of temp?
    Thanks,

    Mark

  12. #12
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    Quote Originally Posted by markf57 View Post
    I have an IAQ. Wouldn't if be nice if I could set my thermostat for dew point instead of temp?


    NO.

    At 80DB and 60DP your RH would be 50.5%
    At 76DB and 60DP your RH would be 57.6%
    At 72DB and 60DP your RH would be 65.9%
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  13. #13
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,376
    Quote Originally Posted by beenthere View Post
    NO.

    At 80DB and 60DP your RH would be 50.5%
    At 76DB and 60DP your RH would be 57.6%
    At 72DB and 60DP your RH would be 65.9%
    The ASHRAE guide for buildings in hot and humid climates strongly recommends that building interior dew points in these climates be maintained below 55 degrees F. With that in mind, your chart changes as following:

    80db @ 55dp = 42% RH

    76db @ 55dp = 48% RH

    72db @ 55dp = 55% RH

    The 55 degree dew point or less is based on the ASHRAE Human Comfort Range stated in the Handbook of Fundamentals as well as several other publications, such as Humidity Control Design Guide.

    The ACCA Manual J default indoor design temp and RH of 75db @50% RH = 55 degrees dew point.
    Last edited by Shophound; 08-05-2009 at 06:07 PM. Reason: added "dew points" after building interiors
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

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