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  1. #1
    Join Date
    Oct 2012
    Posts
    16

    New Addition questions

    Guys,
    I'm a newbie here so give me a little leash on my request. I know enough to be dangerous about HVAC. I am currently in the process of working on finishing out my 2nd floor attic which is adjacent to my game room which is finished and separated by an insulated exterior door. I currently have an 8 yr old 1.5 ton Trane electric heat pump servicing roughly 750 finished sq ft upstairs. My addition will add approx 8-900 sq ft upstairs. Obviously my current setup will not service that. I have had a trane contractor come out and quote me a 3 ton, 13,15 and 18 seer option. I just had a different contractor out this morning that essentially eyeballed it and said I think we'll need to add one return and we can do a 3 ton to cover it, he recommended a 13 or 15 Seer American Standard unit. I would love to do a gas furnace option if possible but I'm on LP for now and hope that natural gas will make it out to me in the near future. I am in NC and we do have quite a few weeks every summer with 100 degree and 60-80 percent humidity days. That current 1.5 ton would let it get up to 78 or 80 on really hot days as it just can't keep up.

    I guess what I need help with is how do I know the differences in these various brands and types of units? Also, if I am doing a dedicated theater for most of this space I am finishing and I plan on also having an equipment room that will get very hot and a separate bedroom, will one return cut it? I would think I would need at least two to move enough air. The tech this morning said oh well we'll just do one bigger one in the theater. I didn't really like that answer.

    Looking for help, glad I found this place!

    CW

  2. #2
    Join Date
    Jul 2006
    Location
    Georgia
    Posts
    373
    Ductless.

    Sent from my XT907 using Tapatalk 2

  3. #3
    Join Date
    Oct 2012
    Posts
    16
    Huh? Care to elaborate?

  4. #4
    Join Date
    Oct 2012
    Posts
    16
    I assume you're referring to a mini split. I don't want to go that route. I need to keep the noise from this unit down and I don't want to see the unit in the room. Also, I don't think my HOA would be ok with a mini.

  5. #5
    Join Date
    Sep 2009
    Location
    Arnold mo
    Posts
    3,795
    How you finish out that attic will play a big part in how & what you will need to heat/cool it. Do you have any knowledge in Building Science to air you in finishing that attic?
    An answer without a question is meaningless.
    Information without understanding is useless.
    You can lead a horse to water............
    http://www.mohomeenergyaudits.com

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,416
    LOAD CALC!!!!!

    Anyone who doesn't do that, dispose of properly. A room by room calc will tell total capacity needed and CFM per room. Only way to do it. No eyeballing!

    If they cut corners designing your system, what corners will they cut putting it in?

  7. #7
    Join Date
    Aug 2012
    Location
    North Dakota
    Posts
    502
    one big return in your theater will make for alot of background noise though sorround sound systems are loud are'nt they???

  8. #8
    Join Date
    Aug 2012
    Location
    North Dakota
    Posts
    502
    by the way your gas furnace starting as propane to change it to nat. gas is a fairly simple kit any qualified tech. can do

  9. #9
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,001
    1600 square feet /// finished properly can be handled by a 2 ton.

    R-15 walls
    R-30 ceiling
    Floor to conditioned Space?

    Window size in each direction ...?
    Small TOTAL Area of /windows means 2 ton HP is likely O.K.

    CFM per room needs to be addressed in Significantly MORE DETAIL.
    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
    Oct 2012
    Posts
    16
    This space will all be above conditioned space. There will be two 30" windows in the space. 2 ton seems to be small. What would you consider properly finishing it? I agree one return will probably not be enough and I don't want to hear the return or the registers when the system is running at full blast. I plan on doing at least r15 in the walls abd r35 in the ceiling as that is code in NC now.

  11. #11
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,001
    Quote Originally Posted by wraunch View Post
    This space will all be above conditioned space. There will be two 30" windows in the space. 2 ton seems to be small.
    What would you consider properly finishing it?
    I agree one return will probably not be enough and I don't want to hear the return or the registers when the system is running at full blast.

    I plan on doing at least r15 in the walls and R35 in the ceiling as that is code in NC now.


    Properly finished = Exceeds Code and Well Sealed ( low infiltration)

    So 25 square feet =total window area with 12.5 facing East and 12.5 Facing West.

    IS that at 5,600 foot elevation or 12 feet? Town would be appropriate reply.
    Design temps
    Summer 93'F
    Winter 16'F ?

    74'F / 72'F Inside Summer/ Winter
    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

  12. #12
    Join Date
    Oct 2012
    Posts
    16
    Raleigh, NC. Summer temps probably average 95, low in winters around 30. I would prefer 74 summer/ 72 winter.

  13. #13
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,001
    Manual J 8th edition, Abridged

    19,700 ---------- Heating
    13,800 BTU/HR Sensible Cooling

    based on post #11 info
    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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