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  1. #1
    I made a least 20 calls this morning about getting a load calculation on my home (Daytona Beach). The contractors that do the calculation only do them on new construction. I guess I'll try the software and do it myself. Any tips or advice on things to watch out for???

  2. #2
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    17,606
    Thats just crazy!! Anybody here from Daytona Beach area that can help this person out?
    "The road to Hell is paved with progressive policies."

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    I thought you had Total Comfort coming out Saturday,the can probably do that for you.I'd call them back and tell them what you want,ie a Manual J.

  4. #4
    Originally posted by dash
    I thought you had Total Comfort coming out Saturday,the can probably do that for you.I'd call them back and tell them what you want,ie a Manual J.
    I did, they said the Sales Rep would give me a good idea of the tonnage I need, but they would only do a load calculation if I contracted them to do the installation. I asked how they could give me an accurate estimate if they are not 100% sure what size unit I require. The rep told me, "it's not rocket science". I give up!! I'll just try to do it myself, with the software!! I got a couple of links from a previous post, it seems to walk the user through the process step by step.

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    They may not have explained it well, but that approach could be fine ,and has been mentioned several times by members of this site.

    If the unit was too small,you would know,so it's either correct size or too large.So if they quote based on what you have,then do the calculation,if less is needed the price would go down slightly ,but definately not up,so you'd be happy.

    The cost difference ,in a half ton difference is not that great.

  6. #6
    Join Date
    Feb 2002
    Posts
    3,182
    [QUOTE]Originally posted by junior1964
    [B]
    Originally posted by dash





    The rep told me, "it's not rocket science".


    Thats because the "rep" probably has no clue how to do a heat loss/gain.
    Go to the top of the page and click on the bullseye. You can do the load calculations yourself. Its a very easy program to follow. If the company can't do a load calculation when they give you a bid I would look elsewhere for a price. Calculating the right size unit(s) for a home isn't "rocket science", but it is necessary if you want a properly sized system.



  7. #7
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    get out the measuring tape -- window &door opening size, room size, how many windows to south, to west ( esp for heat gain | summer), check the insulation depth & type in attic & walls (say beside a switch box), general construction type = brick, stucco, frame, etc. just takes some time mainly.

  8. #8
    Originally posted by cem-bsee
    get out the measuring tape -- window &door opening size, room size, how many windows to south, to west ( esp for heat gain | summer), check the insulation depth & type in attic & walls (say beside a switch box), general construction type = brick, stucco, frame, etc. just takes some time mainly.
    Time is the one thing I have. My unit is keeping the house pretty cool even in these extreme temperatures. But it is 10 yrs old and I have noticed it seems more humid in the house this year compared to last. I want to stay ahead of any problems if I can.

  9. #9
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,004

    Drawings + Window Schedule.

    Originally posted by junior1964
    I made a least 20 calls this morning about getting a load calculation on my home in Daytona Beach. The contractors that do the calculation only do them on new construction. I guess I'll try the software and do it myself.

    Any tips or advice on things to watch out for???

    How many windows ( Sq.Ft.) on each side?
    Windows:
    __ Clear or Tinted Glass
    __ Interior treatment

    Infiltration:
    ____ A.C.H.
    Duct work location:
    ____Attic ?
    House Age:
    ____Insulation
    ____Infiltration:

    Curious: Current Electric Bill
    #/size Systems
    Sq.Ft. House

    TIPS:
    See ACCA Manual J, 8th edition
    along with Appendices A, C and D.

    or Send me _Plans& Specs_ ( i.e. cem-bsee post)
    for a load analysis.

    Providing room-by-room layout in .DWG or .DWF format
    would be a nice time-saver.

    _20 calls (most of the morning) is likely more effort than development of good load analysis after layout is established.

    Best of luck.
    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

  10. #10
    Join Date
    May 2004
    Posts
    11,859
    In this corner you have members of the HVAC profession working tirelessly to improve their trade and openly discussing issues and situations with others.

    In the other corner you have members of the HVAC profession that say “it ain’t rocket science” and won’t give what the customer asks for, peace of mind.

    Nice. Where are my little gold stars…. I want to pin this one.




  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,831
    What dash said.


    Contractor locator map

    How-to-apply-for-Professional

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

  12. #12
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,004

    Improvements

    Originally posted by junior1964
    [B Time is the one thing I have. My unit is keeping the house Pretty Cool even in these extreme temperatures.

    But it is 10 yrs old and I have noticed it seems more humid in the house this year compared to last.
    I want to stay ahead of any problems if I can. [/B]
    More humid ...?
    (Trouble shooting + Guessing from afar
    ... West Coast FL .. L.O.L.)

    Measure Delta T DIRECTLY across the Air Handler.
    ___ Supply ~60' and Return 77' or ~ 57% R.H.

    ___ Check refrigerant charge.
    ___ Clean the coils.__ Measure Delta T again.

    ___ Measure Total Air Flow.
    ___ Now you have your Sensible Cooling provided
    S.C.= 1.08 * CFM * Delta T

    Even 2 or 3 degree improvement
    (say, 17' is now 20') will make R.H. gains of nearly 8%.
    Supply 57' (L.A.T.), Return 77' would provide noticable increase in comfort with R.H. at ~50%.
    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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