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  1. #1

    3700 SQ FT home in San Antonio

    I am building a 3700 SQ FT, 2 story home in San Antonio Texas and would like to know if two 14 SEER Goodman units (4 ton and a 2.5 ton) will be enough.

    Thoughts?

  2. #2
    Join Date
    Sep 2002
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    New-construction-must-do-room-by-room-load-calculation-to-properly-design-system-no-exceptions!.

    *Any contractor who uses rule of thumb sizing for new construction has no business selling equipment.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  3. #3
    Understood but my builder is doing a load calculation. I simply wanted to know if the units per size of sq foot sounded ok or not even close. I've been screwed by a builder in the past....

  4. #4
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    I'm not sure how well houses are built in texas (attic insulation?), how hot it gets, how much window surface area there will be, or if the builder is going to (foolishly) put the ductwork into the attic, but 6.5 tons sounds like a lot of cooling for 3700 sq ft.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,765
    I'd say wait until you see a load calc. Along with all its input. And then ask if its sized right.
    Your area has a low latent load.
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  6. #6
    Join Date
    May 2010
    Location
    Thurmont, Maryland
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    50
    Have at least 3 contractors do a load calc and give price. compare, ask questions then pick one.

  7. #7
    AMD,

    All builders in Texas put the duct work in the attic. The house is a "green home" which means it has low -e- glass windows, soffit vents and radiant barrier (tech shield).

  8. #8
    Join Date
    Jan 2007
    Location
    Milwaukee Wisconsin
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    984
    Agree with load calc. but shootin from the hip seems like a lot - maybe not if you have a lot of glass.

    Remember I'm from a different part of the world. How in the world do you Texans stand that heat?

  9. #9
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
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    6,270
    Quote Originally Posted by SANDMAN_SATX View Post
    I am building a 3700 SQ FT, 2 story home in San Antonio Texas and would like to know if two 14 SEER Goodman units (4 ton and a 2.5 ton) will be enough.

    Thoughts?
    Sorry, we can not help you until you get to much a/c. I like to deal with the finer points like get adequate fresh air into the home when occupied to purge indoor pollutants. Also keeping the home <50%RH during wet cool weather. I suggest that you get a large enough a/c to maintain the temperature you want during the hottest days with the home occupied by however many of you there are. Than add a ventilating dehumidifier to provide the fresh air. During hot weather the a/c will maintain the temp/%RH you want. During the cool weather when the a/c does not cool much, the dehumidifier will remove the moisture. Fresh air and dry even during wet cool weather or no a/c operation. There are several brands-Ultra-Aire/Honeywell/Rhem etc.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Even his cool days are hot compared to most areas. Doubt he needs a dehumidifier if the A/C is sized right.
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  11. #11
    The saga continues. The A/C is cooling my new home but I can only get the temp down to 75 degrees on a 100 degree Texas day. I really appreciate it if you could help me answer some of my concerns below:

    How cold should the air be coming out of the vents if the temperature at the intake is 77 degrees? I measured he air from a vent and it read 66 degrees which i thought was too warm. I seem to recall that 18 degrees cooler than the intake is what it should read.

    How cool should the attic temperature be compared to the outside/inside of the home? The home is a green home so i have radiant barrier.

    The upstairs does not have any returns in any of the room (bedroom and theater/game room) and i thought this was odd. Should I be concerned?

    The home is a two story home and my 4 ton unit cools the downstairs while the 2.5 ton cools the upstairs. This has me worried since I thought having a bigger unit cooling the upstairs would make sense since heat rises (tall ceilings). The sq footage is comparable between upstairs and downstairs.

    Thanks in advance!

  12. #12
    Join Date
    Jan 2004
    Location
    Burleson, Texas
    Posts
    1,741
    If you need a second opinion on your systems, contact "sarge" on this forum..He is in S.A. not sure of his coverage..

  13. #13
    Join Date
    Jun 2010
    Posts
    152
    I live in Tx with a 3600 sq ft and there is no way the upstairs should be smaller. Check which is running.

    I have 2 2.5 ton units and i can barley get to 76 upstaires on the recent hot days. 74 at night is no problem

    My house faces south which really helps on the sun heating in the summer.

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