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  1. #14
    Join Date
    Jan 2007
    Location
    NH
    Posts
    265
    Got it online.

  2. #15
    Join Date
    Dec 2000
    Location
    phoenix, arizona
    Posts
    1,135
    Quote Originally Posted by The Juice View Post
    2.5 tons is way overkill for a place that size.
    Here in Phoenix, Arizona. 2-2.5 ton is a very good choice.
    Decide what you want, decide what you are willing to exchange for it. Establish your priorities and go to work." H.L. Hunt

    "In order that people may be happy in their work, these three things are needed: They must be fit for it. They must not do too much of it. And they must have a sense of success in it." John uskin

  3. #16
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,514
    Quote Originally Posted by dan wong View Post
    Here in Phoenix, Arizona. 2-2.5 ton is a very good choice.
    I suppose for a 115F design temp that could make sense

  4. #17
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    67
    Hello Christopher,
    Manual J is a form that indicates the heat loss/gain load. Manual D is for duct design, Manual S is for equipment and Manual T for those eight beautiful inlaid walnut bordered teak wooden registers custom made with decorative wildlife scroll art. Look, you can't really be effective until the load is justified properly. The form will give you specific heat multipliers for various types of construction envelopes considering infiltration and ex filtration to compensate by means of sensible loads as well as latent. I'm sure you could look up equations on thermal conductivity values of K or transfer rates of U; however, this is why the forms above are used as a healthy start for comforting your customer..

  5. #18
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    67
    Just remember the amount of degree days, and the design temperature...

    p.s. Hemoglobin in refrigeration lines might be an oxygen transporter but it would take iron. Imagine a surfactant lined purging system that expelled oxygen rather than non condensable pollutants?

  6. #19
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,355
    Quote Originally Posted by Joseph'bidness View Post
    Just remember the amount of degree days, and the design temperature...

    p.s. Hemoglobin in refrigeration lines might be an oxygen transporter but it would take iron. Imagine a surfactant lined purging system that expelled oxygen rather than non condensable pollutants?
    Drugs are bad, mkay?
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  7. #20
    Join Date
    Feb 2012
    Location
    Durham, NC
    Posts
    73
    A service tech that has never heard of manual j or manual d.... hmmmmmm

  8. #21
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,514
    Quote Originally Posted by hvacvegas View Post
    Drugs are bad, mkay?
    LMOA !!!

  9. #22
    Join Date
    Sep 2008
    Location
    VA
    Posts
    1,845
    Quote Originally Posted by ChrisHVAC25 View Post
    I am a service and repair based company and looking to do a small new install duct/unit etc... The house is 1k sqft and we are putting a 2.5 ton on the house but i need help with the load calcs and the duct sizing... any help would be greatly appreciated... Thanks!!
    Sounds like your customer is getting a great deal!
    "The only true wisdom is in knowing you know nothing" Socrates

  10. #23
    Join Date
    Jul 2010
    Location
    wisconsin
    Posts
    270
    Quote Originally Posted by mgenius33 View Post
    Sounds like your customer is getting a great deal!
    Grossly oversized. I couldve done a better job of a calculation from here, blindfolded.

  11. #24
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,514
    Quote Originally Posted by tiger man View Post
    Grossly oversized. I couldve done a better job of a calculation from here, blindfolded.
    If a 1K house really needs 2.5 tons, some serious weatherization needs ot be done. A 1k house should be closer to a 1.5 ton if insulated properly.

  12. #25
    Join Date
    Feb 2012
    Location
    Durham, NC
    Posts
    73
    wood stove and window units

  13. #26
    Join Date
    Dec 2011
    Location
    North Texas
    Posts
    668
    Quote Originally Posted by Thermodynamics View Post
    wood stove and window units
    X2

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