Help Deciding
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Thread: Help Deciding

  1. #1
    Join Date
    Nov 2006
    Posts
    1
    Hey guys i got a quote from a company here in town that did a Manual J on my house and they said my summer load was 35,586 and winter was around 48,724. I was qouted 2 units.

    the First one being a york 13 seer 3ton R-410A A/C with a two stage 80kbtu furnace he said he needed the bigger furnace for the bigger blower or something for the A/C to work and did a two stage furnace to help save some gas.

    The second quote was a 15 Seer two speed condenser 410-A with a 10yr parts and labor warranty, and my choice of color panels 3 ton A/C. With a 80K BTU modulating gas furnace which he said was 95% effecient .

    Which one do i choose the first unit came with a focuspro 5000, the second with a humidifier, 6" media Filter, Visionpro IAQ and a 1500 rebate.

    Any help is appreciated.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,833
    Where are you? In many areas might be worth asking about dual fuel with a HP outside and gas furnace backup?

    80K 95% furnace is oversized for a 48,000 BTU heat loss!

  3. #3
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,225
    Originally posted by labman
    Hey guys i got a quote from a company here in town that did a Manual J on my house and
    they said my summer load was 35,586
    and winter was around 48,724.

    the First one being a york 13 seer 3ton R-410A A/C with a two stage 80kbtu furnace

    Any help is appreciated.
    35,586 BTUh Sensible Load needs a 4-Ton A/C or Heat Pump

    Proposal from other mechanical contractor(s) would be appropriate.
    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

  4. #4
    Join Date
    Mar 2006
    Location
    The South
    Posts
    2,126
    labman

    While you don't say area of country you live, I like Dan's idea of a heat pump-4 ton 2 stg would be my choice with a small heat strip boost paired with a var spd air handler. Check your electric rate with utility and also your ductwork for handling 4 tons of airflow. This might be your best choice for both comfort and efficiency. There may be tax credit involved-check with dealer. I don't like the idea of an oversized furnace.

    IMO

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,627
    If its a CZB036, you'l only get 32,200 total btu's at 95 OD and 75ID temp.
    An 042 will do 35,900 total at those same temp specs, and 1200 CFM.

    The 036 doesn't need a bigger blower then a 3 ton drive, which is what the 60,000 would have. Unless you live in an arid climate.

    Unless your duct work is undersized, and he's trying to force the air theouogh your ducts, which would then give you a loud system.

    Might want to ask him his reasoning again.
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  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,833
    Where does it say sensible load? He said summer load which should mean total.

  7. #7
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,225
    Originally posted by BaldLoonie
    Where does it say sensible load? He said summer load which should mean total.
    Whatever, a 4-ton unit is likely needed.
    3.5 ton might be sufficient ..
    but only the owner has a clue on TC/SC.
    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

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