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  1. The unit you listed shows a Heating Season...

    The unit you listed shows a Heating Season Performance Factor (HSPF) of 9.0. I'd be willing to bet your old unit was probably less than 8.0, probably a 7.7. The heating performance of the new unit...
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    Whoever did your calc used 10 and 95, which are...

    Whoever did your calc used 10 and 95, which are the wrong numbers for Winston Salem. As previously mentioned, the 1% and 99% values are 89 and 23. This is a common error, usually intentional, by...
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    I think you missed his point. Most inefficient...

    I think you missed his point. Most inefficient systems are reasonable during the mild months because they don't run much. Therefore, the electric bill won't be very high. You really should make...
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    I believe you really need to consider adding...

    I believe you really need to consider adding insulation in the walls and ceilings. You have nothing to stop the infiltration of warm humid air into the walls and ceiling. Without insulation that...
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    I believe I would have to install insulation to...

    I believe I would have to install insulation to improve the comfort. Are the walls insulated? If the unit is not running continuously during the hottest days, especially without insulation, it...
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    3 tons for 1200 sf sounds like there are other...

    3 tons for 1200 sf sounds like there are other problems. What is it about this house that has such a large load?
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    "Today, every room has a return" I'll take...

    "Today, every room has a return"

    I'll take that bet!

    You won't find 1 in 10 built that way today, probably 1 in 100.
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    I do not use HVAC-Calc, but Manual J would not...

    I do not use HVAC-Calc, but Manual J would not have you entering interior walls. If you have done so the software probably thinks you have uninsulated exterior walls. That, coupled with it using a...
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    You can use Excel on your computer and plot it...

    You can use Excel on your computer and plot it out. There will be only four data points, so it should be easy.

    Added a pdf copy of a blank sheet from Excel.
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    It won't be perfect unless you do the HVAC...

    It won't be perfect unless you do the HVAC correctly, and it's hard even then to find someone that knows how to do EVERYTHING right.
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    What is the size and number of your existing...

    What is the size and number of your existing return grilles? Are they filter grilles? What is the size of the unit (if you don't know get the model number).
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    Close the crawlspace vents. Cover the ground...

    Close the crawlspace vents. Cover the ground with plastic. Make sure the insulation is in contact with the floor. If it is hanging down and there is an airspace between the insulation and the...
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    Summertime in a humid climate, 50% is NOT too...

    Summertime in a humid climate, 50% is NOT too high. You may want to operate lower, but 50% would not cause problems.
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    Supply grilles are sized for throw and spread...

    Supply grilles are sized for throw and spread with a velocity that will meet acceptable noise levels. Manual T is the guidance document for air distribution. One of the problems with most duct...
  15. Not sure how you can specify a particular grille...

    Not sure how you can specify a particular grille without all of the details. It may make things better, but it may not.
  16. Unles I missed it, you still haven't addressed...

    Unles I missed it, you still haven't addressed the question about apparent excess capacity. If you are doing the extra things to make the house really efficient, such as using foam insulation, good...
  17. Amen to everything you said.

    Amen to everything you said.
  18. You need to read ACCA's Manual T, which is for...

    You need to read ACCA's Manual T, which is for air distribution. This will explain that the "washing" described here is not the best way to design a system. But it's the way it has been done...
  19. Are they planning on installing two units? If so...

    Are they planning on installing two units? If so , one is proposing six tons and the other 7 tons total? Unless you have a lot of window area, or you are not building a very good envelope, this...
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    From an overall energy standpoint the answer is...

    From an overall energy standpoint the answer is generally no. However, from an air distribution and comfort standpoint, they need to be sealed pretty well. You want the air that is intended for a...
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    Go to www.fujitsugeneral.com. You will find...

    Go to www.fujitsugeneral.com. You will find information about the units there as well as contractors in your area.

    These are also inverter models that are very efficient, quiet, and do a great...
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    Fujitsu has a cassette model that allows you to...

    Fujitsu has a cassette model that allows you to run a small duct off to an adjacent room to provide heating/cooling. They are also introducing some new models in 2008 that will have other...
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    You're correct, but only because you can't...

    You're correct, but only because you can't determine what size unit is needed for a given house size unless you have all of the information about the house. That goes for Texas or Alaska. I know of...
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    According to the specs, that is a proper...

    According to the specs, that is a proper combination and should be good to provide heating down to 14 degrees, providing a minimum of 5100 btu/hr up to a maximum of 15,400 btu/hr for each of the 12k...
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    Yes, the heat pumps have limitations, but it...

    Yes, the heat pumps have limitations, but it doesn't sound like that should be a problem for you yet. Most of the Fujitsu units will heat to some level down to 14 deg. Some will even go to zero. ...
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