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Thread: HVAC Size

  1. #1

    Confused HVAC Size

    How do you tell how big a unit is and how big it needs to be sufficient. I was told 1 ton for every 1,000 feet, but don't really know.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,763
    A load calc to tell what capacity you need.

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  3. #3
    Join Date
    Mar 2009
    Location
    Hollywood, Florida
    Posts
    310

  4. #4
    Join Date
    Sep 2004
    Posts
    109
    There is a rule of thumb method, and it works. SOMETIMES! It is not advisable to simply use a general rule as you don't account for heat load. It can be a costly mistake. If you want to know the size of your unit you have to decipher the nomenclature on the data plate.

  5. #5
    Join Date
    Apr 2002
    Location
    Wilkes-Barre/Scranton, PA
    Posts
    493
    Quote Originally Posted by supercoolER View Post
    There is a rule of thumb method, and it works. SOMETIMES! It is not advisable to simply use a general rule as you don't account for heat load. It can be a costly mistake. If you want to know the size of your unit you have to decipher the nomenclature on the data plate.
    Yes and the rule of thumb is, there is no rule of thumb period.

  6. #6
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793
    doing a whole house load calculation is quick and simple just make sure you use an "approved" method

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