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  1. #1

    Looking for info on standard HVAC system

    The customer wants 68 degrees and I am looking for a way to show him that he is asking too much of the system.

  2. #2
    Join Date
    Apr 2004
    Location
    Charlotte, NC
    Posts
    648
    Why is that asking too much? Is it too old and worn, or not adjusted correctly?
    "Fighting Ignorance since 1973 (It’s taking longer than we thought)." The Straight Dope.

  3. #3
    The system is freezing up at 68 but runs good above 70

  4. #4
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,302
    I keep my place at 68 every night. Have every place I've lived. Never froze a coil yet. We have customers who keep theirs lower. One guy sets it at 63 inside and has no problem. Another family with a huge house and 5 ton builder Rheem keep it mid 60s.

  5. #5
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,837
    Quote Originally Posted by JJMCAY View Post
    The system is freezing up at 68 but runs good above 70
    Sounds like you may not be moving enough air. I keep mine at 67 all the time, 13-years old, never iced up once. Filters clean, coils are clean and the system is properly charged. No ice, no problem. I'd bet the 70 degree air you're feeding over the evap coil is helping to keep it defrosted. Low charge, slow air. That's all.
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  6. #6
    Join Date
    Jul 2001
    Location
    maryland
    Posts
    1,355
    Do you know what the design temps are for the system?

    -JB

  7. #7
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,754
    my bedrooms go down to 68 at night, never had a problem..

  8. #8
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,323

    Talking Comfort Defined

    Quote Originally Posted by JJMCAY View Post
    The customer wants 68 degrees and I am looking for a way to show him that he is asking too much of the system.
    < 78'F at 40% R.H. is FreeZing
    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

  9. #9
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,754
    Quote Originally Posted by dan sw fl View Post
    < 78'F at 40% R.H. is FreeZing

    you people in the south just have thin blood....


    my house is always 70-72 with rh usually around 43- 45%, bedrooms go down to 68 at night.

  10. #10
    Join Date
    Oct 2006
    Location
    MISSISSIPPI
    Posts
    28
    Here in the deep south we keep our house at 69F constantly with no freezing or any other issues. Sounds like an airflow issue. I have several doctors clinics that like to keep there offices around 64 - 65. No problem.

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