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  1. #1
    Join Date
    Jul 2005
    Posts
    8
    I am 'hot in the south' part 2 - Atlanta. Have a two story brick ranch (the basement is finished) that has a rear exterior that faces west. The upstairs is completely vaulted and the entire house is approx 4800 sq. ft. Not many trees and 4 turbine vents on the roof. The house is 7 years old - I have lived in it the last two. When the outside temp gets over 90 degrees the house will rise to 82 degrees. Not a big problem unless you are trying to sell!

    Reading from the RO, the tech cleaned the condenser coil and washed down the compressor. The RO says, 'had 60 degree supply BMP close to furnace and 78 degree return temp on ceiling, unit may be a little small for 92 degree days. I trimmed back the bushes from the A/C unit. Today outside temp- 92 degrees and inside temp- 82 degrees.

    Assumptions;

    1) the original owners would not have tolerated this problem and would have forced the builder to correct. So at some time this should have been working properly. If so, what needs to be corrected?

    2) Everyone before me was OK with the rising temps? So now what would I need to do from a hardware perspective to upgrade my system? More importantly what should it cost?

  2. #2
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    Need to have Manuel J load pulled by contractor to see what size of system is needed.Sounds like something is wrong with the existing system.

    Charge
    Returns
    Ductwork
    The best place to start is to have system checked by PRO.

    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  3. #3
    Join Date
    Jul 2005
    Posts
    8
    What the heck is a Manuel J load??

    Also I forgot to mention that given the western exposure, we do close all of the blinds.

    When you say PRO, what exactly do you mean? How do I know the tech was NOT a PRO?

  4. #4
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    I think he's saying,have the charge checked,duct leaks checked,Correct return and supply duct sizes for required airflow,etc.,by a Pro,yours may not have checked all that could be checked for your insuffient cooling.


    Manual J,from ACCA,is a means of calculating the correct size system for your home as it may be too small.



    A quality contractor(Pro) can handle all the above,call and discuss your situation with them,before engaging their services,be sure they can do all that is needed to save your time and theres.

  5. #5
    Join Date
    Oct 2003
    Location
    Florida's space coast
    Posts
    2,538
    You failed to mention the size of your system.

    You did however report an 18 deree temp. drop across the evaporator which should do the job if system is properly sized for the home.

    If you dont know system size give us make/model #.

    There are many other things to consider, the duct system not being the least of them.

    Best to have a reputable pro check the entire system.

    BTW, a manual J is a heat load calculation to determine the exact cooling needs of your home.
    We've been doing so much,for so long,with so little, that now we can do almost anything, with nothing at all.

  6. #6
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,273
    Originally posted by behmer

    Atlanta.
    two story brick ranch (the basement is finished) that has a rear exterior that faces west.
    upstairs is completely vaulted and the entire house is approx 4800 sq. ft.

    Not many trees and 4 turbine vents on the roof. The house is 7 years old - I have lived in it the last two. When the outside temp gets over 90 degrees the house will rise to 82 degrees. Not a big problem unless you are trying to sell!

    'had 60 degree supply BMP close to furnace and 78 degree return temp on ceiling
    HOW MANY System(s)/ sizes(s) per area?

    West .. one problem
    Vaulted .. another

    Sounds like HOTLANTA!
    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

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,910
    Originally posted by a\c don


    You did however report an 18 deree temp. drop across the evaporator which should do the job if system is properly sized for the home.

    The return temp was taken at the ceiling.

    Could be drawing in attic air.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #8
    Join Date
    Jul 2005
    Posts
    8
    I noticed that all of my windows have serious condensation on the outside every morning. They are thermopane windows. Is that a clue?

  9. #9
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,273

    Sweat OUTside

    Originally posted by behmer
    serious condensation on the outside every morning. Is that a clue?
    Clue ..Right ___
    You must be cooling your house to ~72'F in the evening.
    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

  10. #10
    Join Date
    Jun 2005
    Posts
    83
    Condensation forms on the outside of the windows if the windows are below the "dew temp" of the ouside ambient air.

  11. #11
    Join Date
    Jul 2005
    Posts
    8
    You guys are right! The only way to keep the house from soaring above 80 degrees in the afternoon is to cool it down to 72 at 7 am when we wake up.

  12. #12
    Join Date
    Jul 2005
    Posts
    8

    Confused

    Is changing the blower speed an option? I am getting poor airflow intothe rooms farthest from the attic unit. How can I tell if the unit has already been turned up?

  13. #13
    Join Date
    Jun 2005
    Location
    GA
    Posts
    30
    Behmer -

    It's not a popular option around here, but I had a similar situation (Atlanta area) and was able to get my temps down with attic fans. Pulled all 4 of those useless turbines out while I was at it.

    Check out this (looong) post for the discussion on fans: http://hvac-talk.com/vbb/showthread.php?threadid=77345

    I've measured the register temps with or without fans and can see up to a 6 degree rise in the registers furthest from the unit. Those attic temps are tough on ducts, no matter what kind of insulation they have.

    Also, you must have plantation shutters or something to block that afternoon sun.

    Good Luck.

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