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  1. Replies
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    Another thing about the utility point of view, is...

    Another thing about the utility point of view, is usually a cut in residential demand (peak KW) goes hand in hand with a cut in energy (KWH). Since most utility tariffs are based simply on KWH, they...
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    I also recently bought the Allegiance 15 unit,...

    I also recently bought the Allegiance 15 unit, with matching coil when the old system's coil developed a leak. The unit I have is quiet, without the clunk sounds you mention. At least I have not...
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    The original paper sure seemed to say 86 CFM was...

    The original paper sure seemed to say 86 CFM was the average duct leakage for the Houston area homes. Houston homes built in the last decade are not small, and it could be reasonably estimated the...
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    Thank you Genduct, for pointing out how things...

    Thank you Genduct, for pointing out how things have evolved.

    Best wishes -- Pstu
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    The attachment is a scanned page from ACCA Manual...

    The attachment is a scanned page from ACCA Manual D. That is a direct answer to your question. Copyright 2002, page 3-6. I believe there is a later version of this book.

    It sounds as if your...
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    If your arithmetic is correct, 1000 fpm is way...

    If your arithmetic is correct, 1000 fpm is way higher than ACCA Manual D says is acceptable. My copy of Manual D says 700 fpm is maximum.

    Not many people get static pressure checked on their...
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    I am bedazzled by the things you are discussing...

    I am bedazzled by the things you are discussing which are not even in my vocabulary. I have the intuitive hunch you might find something practical in this paper of Lstiburek's, if you have not...
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    Wish Carnak were still around, he probably would...

    Wish Carnak were still around, he probably would have an example house he worked on, in a comparable climate.
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    I am a homeowner west of Houston TX. A question...

    I am a homeowner west of Houston TX. A question was asked about solar screens. Based on personal experience, solar screens can make a big difference in room comfort, so I believe they would be a...
  10. Thread: Working in attics

    by pstu
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    2,770

    I think your air temperature inside the supply...

    I think your air temperature inside the supply ducts may be a lot different from what you are expecting. AC will typically output air about 20 degrees below the supply air, which implies duct air...
  11. Thread: Working in attics

    by pstu
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    2,770

    This is twice you have mentioned dew point in the...

    This is twice you have mentioned dew point in the 75-77F area. No pro has said dew point needs to be that high to cause trouble. The temperature mentioned was 60, is it possible your dew point could...
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    Note that they spend several dense sentences...

    Note that they spend several dense sentences acknowledging the oddity of their result, and then going further to claim duct leakage of 86 CFM25.

    There had to have been some actual testing via...
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    If you look on page 44 of the Adobe document...

    If you look on page 44 of the Adobe document (labelled page 39) there is a paragraph which addresses their statement of duct leakage. I interpret it as consultant bafflegab and wonder if you might...
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    Useful resources

    A company named Tamarack Technologies used to have a paper titled "The Problem of Pressure". While oriented toward product sales, it had some valuable info including answers to your question. It...
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    Houston is pretty much the "Wild West" of home...

    Houston is pretty much the "Wild West" of home construction. Only a few Municipalities have rules regarding duct leakage, e.g. Katy which is outside the survey area. In most regions builders...
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    While they do say what you quoted, the one I was...

    While they do say what you quoted, the one I was dwelling on said "Building envelope leakage appears to be responsible for about 14 percent of summer/cooling loads while duct leakage only appears to...
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    The source of the 3% number is from this study: ...

    The source of the 3% number is from this study:

    http://www.advancedenergy.org/buildings/knowledge_library/FINAL_Paper_Houston_Energy_Efficiency_Study.pdf

    Right there on page 3 it makes this...
  18. Thread: adding air return

    by pstu
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    9,146

    Cherokee reports some very surprising...

    Cherokee reports some very surprising observations. There ought to be a VERY publishable paper that could result from a 3rd party visiting the house, repeating the observation, and making enough...
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    Duct leakage in cooling loads

    For construction in the last decade, Houston region, does it seem plausible to professionals that duct leakage would account for 3% of cooling loads? I always thought average duct leakage was higher,...
  20. More expert info

    Thanks for sharing that, it is far more accurate than my memory was.

    I think your arithmetic is right, you could get down to approximately that natural ACH if you could halve your leakage area....
  21. We still may not be communicating properly. Your...

    We still may not be communicating properly. Your number of 8.4 ACH50 is only about 50% higher than mine, it is an entirely plausible number. I have heard that a crude way to estimate natural ACH is...
  22. My own house was tested at 5.3 ACH50 and it is...

    My own house was tested at 5.3 ACH50 and it is not an energy hog. 3317 CFM at 50 pascals. Fairly well sealed but not exceptional. The blower door report also told me "estimated annual average air...
  23. Thread: adding air return

    by pstu
    Replies
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    9,146

    It seems to me the proposed T-ed return has many...

    It seems to me the proposed T-ed return has many characteristics in common with a jump duct, is that not right?

    If the addition is well sealed, I certainly would be interested in learning what the...
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    It sounds like you believe the lack of clamps...

    It sounds like you believe the lack of clamps caused the problem, and the original company claims the old drain line caused it. Get an expert opinion on that, and you may be closer to settling the...
  25. Thread: NEW SYSTEM

    by pstu
    Replies
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    3,562

    You are completely not seeing the downside of...

    You are completely not seeing the downside of getting it wrong. "It" refers to a wide variety of possible errors. Try it and you will eventually see what I mean.

    This reminds me of a car with a...
  26. Thread: NEW SYSTEM

    by pstu
    Replies
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    3,562

    If these were appliances and you could just pop...

    If these were appliances and you could just pop them in, that would be true. Unfortunately to you and me, it takes a lot of skill to get a good install. The number of bad installs attests to that.
    ...
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    It's a small job to buy replacement supply...

    It's a small job to buy replacement supply grilles. Rather than pay the builder's extra price, may be advantageous to buy replacements at a good price and just junk the standard ones. I did that on...
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    Thanks Tedkidd for the list. I am mostly in...

    Thanks Tedkidd for the list. I am mostly in agreement and proceeding slowly toward the goal. FWIW my "before" building leakage is 0.53 ACH50.

    One thing I would like to see more of, is...
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    I would be very favorably disposed toward any...

    I would be very favorably disposed toward any system using the Evolution controls. That is one of the unique features not equalled on any other brand I know of. While I am invested in Trane equipment...
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    Please do post a copy of your bill, when you are...

    Please do post a copy of your bill, when you are able to scan it. Maybe in its own thread. I used to work for an electric company and am hopeful I could make sense of it.

    In the meantime, you can...
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    I sure am glad you posted this info Wakko. I am a...

    I sure am glad you posted this info Wakko. I am a homeowner and to my understanding there are several ways to know you need more return. One ACCA rule is the air speed in the return must be under 700...
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    I heartily endorse solar screens to reduce load...

    I heartily endorse solar screens to reduce load if you have an East or West facing window. Our bedroom had a couple hours of uncomfortably warm temperature with some East facing windows, adding solar...
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    I am a homeowner in S. Texas. Texas is hot, but...

    I am a homeowner in S. Texas. Texas is hot, but Phoenix is VERY hot, am I right? Based on that I urge you not to be overly concerned about SEER, if you want efficiency then look at the EER number...
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    It has crossed my mind one might learn a lot...

    It has crossed my mind one might learn a lot about a duct system by applying manometer readings at various points along the way.
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    I am *not* saying 2 tons isn't enough, but the...

    I am *not* saying 2 tons isn't enough, but the only real downside I can see is mis-matching duct sizes if the owner wants to upsize in Denver. Keep in mind here there is little or no humidity problem...
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    I am a homeowner west of Houston with the XL19i...

    I am a homeowner west of Houston with the XL19i as one of two systems. The model most similar to the newer XL20i. The benefit you might see is running long times with about 2.2 ton capacity, which...
  37. Does anyone else agree with that arithmetic?

    Does anyone else agree with that arithmetic?
  38. I will second the idea that improvements to your...

    I will second the idea that improvements to your house to use less energy, will be much more profound than simply upgrading the machinery and leaving the house alone. Problem is, it's too easy to...
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    Have you tried searching the AHRI database for...

    Have you tried searching the AHRI database for components that match what you already have? Sounds like the furnace and coil would be keepers if you could find a good condenser that matches.

    Hope...
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    There is a legal standard of "a livable...

    There is a legal standard of "a livable apartment", is there not? It would seem entirely appropriate to begin legal proceedings against them.
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    This is a really unusual question and I am unsure...

    This is a really unusual question and I am unsure whether there is merit to the idea. Is the attic dusty like I imagine it is? If so a HEPA filter would load up very early and that might be a problem...
  42. Thread: NEW SYSTEM

    by pstu
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    3,562

    That 600 sqft per ton rule is a complete fallacy....

    That 600 sqft per ton rule is a complete fallacy. It does not work that way anywhere in the country. Load calcs are the only way to identify what BTU size is needed.

    You still have not recognized...
  43. Thread: NEW SYSTEM

    by pstu
    Replies
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    3,562

    Now I see what you are thinking. The higher...

    Now I see what you are thinking. The higher EER/HSPF will indeed save you that money, provided the install lets it perform as it should. There are stories about people failing to see the promised...
  44. Thread: NEW SYSTEM

    by pstu
    Replies
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    3,562

    Best to not worry about "almost constantly...

    Best to not worry about "almost constantly working" unless the AC actually won't do the job you ask of it. That is why I asked if it maintains set point. The ideal, most efficient AC will usually run...
  45. Thread: NEW SYSTEM

    by pstu
    Replies
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    3,562

    Ask the pros whether that helps efficiency. I...

    Ask the pros whether that helps efficiency. I think not.

    If you needed temp pulldown faster that would be a legit customer want/need. But you did not say that.

    Adding 25% to airflow, it is...
  46. Thread: NEW SYSTEM

    by pstu
    Replies
    60
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    3,562

    But would it maintain set point?

    But would it maintain set point?
  47. Thread: NEW SYSTEM

    by pstu
    Replies
    60
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    3,562

    The lesson I learned from this board is, I would...

    The lesson I learned from this board is, I would rather have any random brand well installed, than the best brand with a mediocre install. I have Trane and all things equal would prefer it, but the...
  48. Thread: NEW SYSTEM

    by pstu
    Replies
    60
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    3,562

    I am a homeowner and would never do what you...

    I am a homeowner and would never do what you propose to do, but to answer your direct question there is nothing wrong with the equipment you mention. They may not work well in your case but it's not...
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    I have some of the dehus (Soleus and SFRX) being...

    I have some of the dehus (Soleus and SFRX) being discussed, and have to believe if you are willing to construct a plywood box around a dehu, it will become much more quiet outside the box. Think of...
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    I am very glad to hear you have something good...

    I am very glad to hear you have something good enough for a 6 degree drop in indoor temperature. To me that is a major improvement. That illustrates the TXV valve was outside the knowledge of the...
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