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  1. #1
    Join Date
    Oct 2005
    Location
    Pasadena
    Posts
    3
    We are adding 1,400 sqft to our existing 1,600 sqft house. The addition will be on the 2nd floor. How large a system should we be looking at? Would it make sense to have two different zones, one for the upstairs and one for the downstairs?

  2. #2
    System sizing

    2 systems or one system with two zones.

    Helpful link

  3. #3
    Join Date
    Aug 2004
    Location
    Tyler TX
    Posts
    676
    Try using the hvac calc software at the top of the page to find out what size equipment you will need. It is always best to have zone system or a separate system when you have a 2 story home.
    HVAC Contractor, Tyler Texas.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,586
    1400 sq ft addition, put a second unit in for it.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,379

    Question Anywhere, CA

    Originally posted by californiadreamer
    We are adding 1,400 sq ft to our existing 1,600 sq ft house. The addition will be on the 2nd floor. How large a system should we be looking at? Would it make sense to have two different zones, one for the upstairs and one for the downstairs?
    TWO SYSTEMS ARE REQUIRED
    Factors which determine size:
    Location ___
    ___ Location
    ______ Location
    Design temperature is 101'F for Bakerfield
    ................... 95'F for Pasadena
    ................... 83'F for San Francisco

    House and Window Orientations ___
    ... 50 feet x 28 feet or so
    .50 or ___ feet faces West with 60 or ___Sq. Feet Windows
    .50 or ___ feet faces East with 60 or ___
    .28 or ___ feet faces North with 40 or ___
    .28 or ___ feet faces South with 40 or ___

    Window type__ Shading coefficient
    Total Window area ~ 200 to 250 Sq. Ft.
    ___ Overhangs
    ___ Curtains or Blinds

    Based on 75'F inside temp and above,
    you may need 3 or 3.5 tons for Bakersfield.
    like ~ 2.5 or 3 tons for Pasadena
    like only 2 tons for San Francicso with 83'F design temp.

    Other locations and orientations than asusmed
    Who Knows?

    In other words, ALL of the SPECIFICS ARE REQUIRED.

    [Edited by dan sw fl on 10-22-2005 at 07:43 AM]
    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

  6. #6
    Join Date
    Oct 2005
    Location
    Pasadena
    Posts
    3

    Smile What Size System

    Thank you to all those who replied. It sounds like I should get two systems. If I need a total of 3 tons, I assume I need two 1.5 systems? Is that correct?
    Also, I have heard that leaks in the ducting system is very common how do I check whether my contractor has done a good job installing the ducts?

  7. #7
    Join Date
    Oct 2005
    Location
    Pasadena
    Posts
    3

    Re: Anywhere, CA

    Dan, Thank you for such a thorough reply. It sounds like I should get two systems. If I need a total of 3 tons, I assume I need two 1.5 systems? Is that correct?
    Also, I have heard that leaks in the ducting system is very common how do I check whether my contractor has done a good job installing the ducts?

    TWO SYSTEMS ARE REQUIRED
    Factors which determine size:
    Location ___
    ___ Location
    ______ Location
    Design temperature is 101'F for Bakerfield
    ................... 95'F for Pasadena
    ................... 83'F for San Francisco

    House and Window Orientations ___
    ... 50 feet x 28 feet or so
    .50 or ___ feet faces West with 60 or ___Sq. Feet Windows
    .50 or ___ feet faces East with 60 or ___
    .28 or ___ feet faces North with 40 or ___
    .28 or ___ feet faces South with 40 or ___

    Window type__ Shading coefficient
    Total Window area ~ 200 to 250 Sq. Ft.
    ___ Overhangs
    ___ Curtains or Blinds

    Based on 75'F inside temp and above,
    you may need 3 or 3.5 tons for Bakersfield.
    like ~ 2.5 or 3 tons for Pasadena
    like only 2 tons for San Francicso with 83'F design temp.

    Other locations and orientations than asusmed
    Who Knows?

    In other words, ALL of the SPECIFICS ARE REQUIRED.

    [Edited by dan sw fl on 10-22-2005 at 07:43 AM] [/B][/QUOTE]

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