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  1. #1
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19

    Better Trane Set Up?

    3500sq foot residential in Los Angeles, needs A/C and heat unit, which is the better set up?
    1 month of cooling, 4 months of heating.
    here are the configurations I have been suggested.

    1. Downstairs:Trane 4 ton XV95 for ground floor heat.
    Upstairs: Trane 4 ton Trane Split (XV 80 in attic)with compressor (XL14I) on roof.

    2. XV95 with 120,000 btu by Trane
    5ton condenser, XL16i by Trane with matching evaporative coil
    2 zone system with smart dampers.

  2. #2
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    let's see if I understand your account


    #1 wants to put 8 ton of cooling in

    while

    #2 is going with a single 5 ton unit


    Let me suggest you contact another contractor
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  3. #3
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    Quote Originally Posted by dandyme View Post
    let's see if I understand your account
    I dont think I explained myself clearly. since it doesn't get that hot downstairs I was thinking of putting A/C upstairs only, in
    scenario 1:
    4ton 80,000 BTU 95 AFUE heat down stairs
    4ton 80,000 BTU 80 AFUE split system furnace with 14 seer condenser on the outside.

    scenario 2, heat and A/C for the whole house using zoning:
    5 ton 120,000 BTU 95 AFUE
    5ton condenser, XL16i by Trane with
    2 zone system with smart dampers.

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,797
    You confuse people when you list 4 ton, with the furnace that won't have A/C.
    If it isn't going to have A/C, don't include an A/C drive size.

    Just list it as an 80,000 BTU furnace.



    Which is better?

    How much do you think only having the second floor Cooled will effect resell value.

    I would think the zoned system would be better.
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  5. #5
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    Quote Originally Posted by beenthere View Post
    You confuse people when you list 4 ton, with the furnace that won't have A/C.
    If it isn't going to have A/C, don't include an A/C drive size.
    Just list it as an 80,000 BTU furnace.
    Which is better?
    How much do you think only having the second floor Cooled will effect resell value.
    I would think the zoned system would be better.
    Since I have lived in this home for 30 years, I'm not concerned with resale value. I live in a very mild part of the country but for 1 or 2 months out of the year you need A/C. You need heat for about 4 months. The downstairs is like a cave, even when it's 100 outside, you still don't need A/C downstairs.

  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,797
    Did either of them do a load calc to see how many BTUs of heat your house needs.

    Since 1 is proposing 140,000 output, and the other 114,000
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  7. #7
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    Quote Originally Posted by beenthere View Post
    Did either of them do a load calc to see how many BTUs of heat your house needs.

    Since 1 is proposing 140,000 output, and the other 114,000
    Yes several people did load calculations, but people are all over the map because I can't decide if I should
    1:Put a furnace in the basement AND the attic and have each system running independant of each other.
    Or
    2:Go with one large system with zoning so I don't have to have anything in the attic.

    any suggestions would be greatly appreciated

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,797
    The redundency of 2 units is worth while. When one unit stops working in the middle of the night. Or on a cold weekend.

    Either method works well.

    I would think that a zoned system would probably be better in your application. Easier to get enough return air for the system. Plus it would help to prevent stagnation in the summer on the first floor. Since there would be some air bleed through to the first floor in cooling mode.
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  9. #9
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    One concern with the two system approach, is that I don't have a gas line or 220 volt electricity in the attic, is this going to substantially increase the cost of putting a furnace in the attic?
    If the condensor is going to be on the ground level, am I going to have electric,gas and refrigerant lines coming from the attic to the outdoors (house was built in 1920).

  10. #10
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,797
    Yes, you would have those lines.
    May increase cost a lot, or a little. Depends on how hard it is to run the lines.
    Since you already got the quotes. You should be able to see the differences in price.
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  11. #11
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    If I go with the 2 system approach. Is it better to go with:
    1: gas Furnace downstairs, and go with Gas furnace upstairs/with split system condenser.
    2. Gas furnace downstairs and air handler with heat pump (erasing need to run a gas line in attic)?

  12. #12
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,797
    Depends on your electric and gas rates.
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  13. #13
    Join Date
    Oct 2009
    Location
    Los Angeles
    Posts
    19
    Nat Gas is cheapest here and almost exclusively used in southern california to heat homes, electricity is expensive.

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