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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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    1,071

    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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    1,071

    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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    1,071

    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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    1,440

    "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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    924

    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.
  11. Replies
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    1,516

    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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    1,339

    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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    1,234

    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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    1,505

    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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    11,359

    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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    11,359

    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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    There is a National Comfort Institute company...

    There is a National Comfort Institute company called Refrigeration & Electric Service Inc. in Winter Haven. Don't know if they can take care of you but they have the training to establish comfort.
    ...
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    As has been stated, make sure you have someone...

    As has been stated, make sure you have someone that is actually using Manual J to calculate the load for the house. It appears, unless you have excessive windows exposed west, or other possible...
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    Do you have slab insulation? If so, is it on the...

    Do you have slab insulation? If so, is it on the perimeter, underneath, or both? Slab insulation makes a big difference, especially in a cold climate.
  29. Replies
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    You can't make that comparison and conclude his...

    You can't make that comparison and conclude his is ok. What can be done, since oversizing is common, is to question a sized that appears to be based on some rule of thumb and not based on sizing....
  30. Replies
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    1,482

    You need to use the design temperature values for...

    You need to use the design temperature values for your area. Do not chage the temperature values if you want to have an accurate load calculation. I review a lot of Manual J calculations that are...
  31. Without turbine or ridge vents I would guess the...

    Without turbine or ridge vents I would guess the gable vents do not have enough area to relieve the pressure from the soffit vents. So if that is the case, then at least you know the pressure...
  32. It does sound like you have a significant...

    It does sound like you have a significant pressure buildup in the attic. If the pressure difference between the attic and the interior is high, dust will find every little hole that you can't find...
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    Where in Texas? There are some top notch guys on...

    Where in Texas? There are some top notch guys on this board from Texas and they may be close enough to help out. You may have both a building problem (moisture management) as well as an HVAC...
  34. Thread: sanyo ductless

    by dcmcm5
    Replies
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    1,843

    Not familiar with Sanyo, but I believe you will...

    Not familiar with Sanyo, but I believe you will need a disconnect for the condenser outside and another disconnect for the power running back to the inside unit. Can you not get diagrams off of the...
  35. I have just about every piece of equipment you...

    I have just about every piece of equipment you would need, including an infrared camera. If you are willing to send me an email (from my profile) we might be able to work something out.
  36. Where are you located? I may know someone that...

    Where are you located? I may know someone that can help.

    You can also look here http://www.resnet.us/directory/raters.aspx for a rater near you. They will all have blower doors and duct blasters,...
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    Where are you located? There might be someone on...

    Where are you located? There might be someone on this board close to you that could help.
  38. Replies
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    You're smart to worry about the install, because...

    You're smart to worry about the install, because that is what will make or break your comfort. You can get great performance from any of the brands that are designed and installed correctly. There...
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    You could use the two 9K units with an 18K...

    You could use the two 9K units with an 18K condenser. Not sure about an 18/12 combination with these, but would not advise doing that. I'll think about it awile. Don't put the compressor in the...
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    Would you mind posting the Man. J results - i.e.,...

    Would you mind posting the Man. J results - i.e., sensible and latent loads, and the design temperatures used. Also a little info about your house, such as type of windows, insulation levels, etc. ...
  41. Replies
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    Typically a mini-split inverter heat pump will...

    Typically a mini-split inverter heat pump will perform better than a standard heat pump with heating, including down to a lower temperature. I am familiar with Fujitsu, and their heat pumps will...
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    What????? I'm thinking too little air too slow to...

    What????? I'm thinking too little air too slow to the brain.


    As for the fact that the MBR is cantilevered, it is very likely that the floor portion is uninsulated, or there are easy paths for...
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    [QUOTE=amd;1680954]You're looking at hundreds of...

    [QUOTE=amd;1680954]You're looking at hundreds of thousands of dollars to power a HVAC system with solar energy alone. (exception is gas furnace with ecm and no a/c or heatpump)QUOTE]

    Better check...
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    Here is the link for the raters. The other one...

    Here is the link for the raters. The other one was for the providers, which would be able to direct you to raters. This way you can contact direct.

    http://www.resnet.us/directory/raters.aspx
  45. Replies
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    I don't remember 10 SEER systems having an HSPF...

    I don't remember 10 SEER systems having an HSPF of 8.7. Most 13 SEER are below that, typically around 8.2-8.5. What I remember on 10 SEER systems was about 7.7 to 8.2 HSPF. I am going to do a...
  46. Thread: Ductless A/C

    by dcmcm5
    Replies
    7
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    2,019

    Fujitsu also has a "cassette" model that mounts...

    Fujitsu also has a "cassette" model that mounts in the ceiling and all you see is the air diffuser/grille. Would obviously be much easier to install on new construction.
  47. Thread: Ductless A/C

    by dcmcm5
    Replies
    7
    Views
    2,019

    You have to run a condensate drain from the...

    You have to run a condensate drain from the indoor unit to outside or a floor drain. They have a built in connection to hook the piping to.

    There are two refrigerant lines, and typically three...
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    I would be very cautious using a commercial load...

    I would be very cautious using a commercial load calc for residential. Like many of you, I do both but have never taken a floor plan and modeled them in both software packages to see the difference....
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    Wow! Freedom of the Press???? I didn't make...

    Wow!

    Freedom of the Press????

    I didn't make the rules, but agree with them and abide by them. I guess if you want to discuss pricing you can start your own website. The "freedom" available...
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    So why not run the Manual J with shading on the...

    So why not run the Manual J with shading on the glass to simulate the impact from the trees and see what the difference becomes? I expect it won't change the size of the unit.

    The other area you...
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