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  1. #1
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    HVAC system for San Diego

    Hello all,

    I am a new home owner in SD, CA. Originally, I want the ductless system, but I decide we should go with central system due to the cost. I looking forward to install a new central AC as well as replace old furnace. The contractors advice to replace the duct, so I would do that.
    My house is about 1542 sqt single house with 1 floor, and it has four rooms.
    My questions are:
    - How many BTU should I get for the furnace?
    - How manu BTU should I get for the condensor?
    - As in my situation, will the 2 stage furnace + AC system be more benificial than the 1 stage system? The price different is about $2000 between the 1 stage and 2 stages system.
    - Do you recomment Carrier or Trane better?
    Edit 1: - Will there be a different in operation cost between 80% 1 stage and 80% 2 stage? According to HVACOPCOST, there is no different in the operation cost.
    Thank you very much in advance.

  2. #2
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    A load calculation will answer both of your questions about size.

    The brand is less important than the contractor. A poor installation will ruin good equipment. A good installation will make the most of cheap equipment.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  3. #3
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    Thread Starter
    Thank you for the reply. How about the 2 stages and 1 stage system? Do you think it will worth the extra $2000 as the system will be install in SD?
    Thank you

  4. #4
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    You’ll be better off with a single stage system and a ducted dehumidifier which will operate during low load conditions.

    BTW, a load calculation is NOT X sq.ft. per ton. There is a link to a free one in my sig.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  5. #5
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    Indianapolis, IN, USA
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    I've been there. The weather varies greatly from one side of the county to the other. Out in the desert it could be 90, by the ocean 50. So make SURE whomever sizes it doesn't use the dreaded x sq ft per ton that Dean talks about. His advise about basic A/C and a dehumidifier is good if you are more ocean area. Personally, I wouldn't spend the extra on 2 stage.

  6. #6
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    Thread Starter
    @Dean: thank you for the recommendation. I tried the link, but I don't really know what kind of i sulation I have on the outside wall. Apologize for my stupidity.
    Usually, will the contractor do the load test? Do we have to request the test? So far, when the contractors came, they look around the house, the electric board,and quick look at the attic, then provide me quotes.

    @BaldLoonie: my house goes toward east from the ocean. I work at Naval base on 32nd street, and my house is about 5 - 6 miles from the base, going toward east. If this help.
    I will look more into dehumidifier.

  7. #7
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