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  1. #1

    Post

    Can anyone tell me if there is a general rule for units when the outside temp is X degrees, the unit should be able to cool down to Z degrees?
    I think my unit may be dying... the outside temp is about 88F and the unit is barely keeping the house down to 75F (thermo is at 72, so I like it cool.)

  2. #2
    Join Date
    May 2004
    Posts
    12,259
    Some may differ but something like 18 to 22* difference.

    But there a lot of variables involved

  3. #3
    Join Date
    Sep 2003
    Posts
    1,311
    That is the main purpose in calculating heat gain in the heat load calculations - to determine what size of unit is required to maintain a given temperature differential between indoors and outdoors. Some areas are OK with 10 and others prefer over 25. It depends on the area you live in.

  4. #4
    I live in South Louisiana. Gets pretty hot down here during the summer.
    The unit I have is original to the house which is about 20 years old. I know the efficiency must have dropped off some, but other than this temp difference issue, she is working OK.

  5. #5
    Join Date
    Sep 2003
    Posts
    1,311
    What's your city or what is the closest large city?

  6. #6
    NewOrleans

  7. #7
    Join Date
    Sep 2003
    Posts
    1,311
    The ACCA recommended value is 75 indoor @ 92 outdoor = 17 TD.

  8. #8
    Join Date
    Sep 2004
    Posts
    3,157
    Have you changed the filter? how often have you been changing it and how dirty are they when you change them

  9. #9
    I have an electrostatic filter that I clean usually once a month. Sometimes its dirty and sometimes just a little.
    The filter is a little old... time for a new one maybe?

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