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  1. Replies
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    I agree with Dan for normal construction. With...

    I agree with Dan for normal construction. With foam insulation the home will probably have less natural infiltration in a breeze.
    Bring in 100 cfm of fresh air and 4 occupants is about 5 lbs. of...
  2. You asked me about the optimum moisture removal...

    You asked me about the optimum moisture removal of a coil by making colder than the desired dew point in the home.
    Using the saturated temperature of the coil for ideal setup is best. The...
  3. Colder ducts in damp space will have more...

    Colder ducts in damp space will have more condensation on the ducts. If you are in a green grass climate, get one good whole house dehumidifier with warm dry air duct to the crawlspace and the...
  4. The restricted duct system the main reason that...

    The restricted duct system the main reason that a/c remove as much moisture as they do.
    Restricting a 5 ton down to 3.5-4 ton is what is required to remove 25% latent to maintain <50%RH during...
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    During the high heat of the day while the a/c...

    During the high heat of the day while the a/c operates +50% of the time, a well tuned a/c should be able to maintain 50%rH. Evenings and rainy days with very short or no cooling loads, the a/c will...
  6. Sorry, I'm all choked up atfer that post! And...

    Sorry, I'm all choked up atfer that post!
    And you know the best is yet to come. It is about the long term health effect on the occupants health because of low indoor pollutants and optimum oxygen...
  7. What are your expectations? A couple of well...

    What are your expectations? A couple of well setup a/cs and a dehumidifier in the crawlspace well get you a home that and crawlspace with be comfortable during the heat of the day. The crawlspace...
  8. A lot of good comments. It is a combination all...

    A lot of good comments. It is a combination all of the above. The final adjustment is the air flow. This determines the amount of moisture removal verses the sensible cooling rate. Less air flow...
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    This is the heart of the problem. How much fresh...

    This is the heart of the problem. How much fresh air infiltration and what is the dew point plus the number of occupants are the sources of moisture.
    The capacity of the a/c sensible and latent...
  10. Replies
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    This has become a big enough issue that some big...

    This has become a big enough issue that some big class builders are installing a whole house dehumidifier rather than fight the fact an a/c is unable to remove significant moisture evenings and...
  11. Replies
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    Also include a small whole house dehumidifier...

    Also include a small whole house dehumidifier like the Ultra-Aire 70H with the fresh air option. This is critical for filtered fresh air change and maintain 50%RH humidity during damp weather.
    Get...
  12. Sorry for the confusion on my part. Keep us...

    Sorry for the confusion on my part.
    Keep us posted.
    Regards Teddy Bear
  13. A little confusing. I like the idea of sucking...

    A little confusing. I like the idea of sucking air from the upper level of the home to the dehumidifier with a significant portion of the dry air going to the lower levels with the balance going to...
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    What is the outdoor dew point? We are having the...

    What is the outdoor dew point? We are having the same problem in SW FL. The outdoor dew point is 68-70^F with a high of 84^F during the day and 70^F low at night.
    The a/c runs a couple hours during...
  15. The interesting part is that the minimal air flow...

    The interesting part is that the minimal air flow recommended is about right for the about right to get adequate dehumidification with their high SEER equipment. It is about 30^F coil temperature...
  16. I hate make this more complicated,but--. Large...

    I hate make this more complicated,but--. Large coil high efficiency a/cs can be setup to remove high latent and be efficient by adjusting the air flow to get a cold enough coil to get an adequate...
  17. The a/c removes moisture based on the amount of...

    The a/c removes moisture based on the amount of air flow through the cooling coil. Less air flow increases moisture removal and less sensible cooling. The air flow adjustment is critical more so...
  18. I must express some pride in what you...

    I must express some pride in what you accomplished in getting what appears to be a first class installation.
    Thanks for your efforts.
    Keep us post how this all works through the upcoming seasons....
  19. Replies
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    Hard to estimate the increase cost plus the...

    Hard to estimate the increase cost plus the little changes avoided by doing whole package instead of coming back.
    Is there a fresh air inlet to the home?

    A Lennox dehu is not the end of the...
  20. Replies
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    1,049

    Humidirol is an a/c with refrigerant reheat. The...

    Humidirol is an a/c with refrigerant reheat. The large cooling coil retains several lbs. of moisture that re-evaporates back into the home causing excess recycles trying to maintain low levels of...
  21. After dry-out, the 60 cfm of fresh dry winter...

    After dry-out, the 60 cfm of fresh dry winter air should bring the home <45% RH without dehumidification. As the outdoor dew point rises above 55^F plus the moisture from the occupants will require...
  22. Replies
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    Two speed cooling will dehumidify slightly better...

    Two speed cooling will dehumidify slightly better by lowering the a/c flow and slowing the compressor while over-cooling. Lower air flow will change the cooling pattern of the a/c. Homes with...
  23. Thread: Make up air

    by teddy bear
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    394

    Most occupants become accustom to higher levels...

    Most occupants become accustom to higher levels of the indoor pollutants and reduced levels of oxygen during calm weather and closed windows.
    Bath fans and close driers can suck air in from some...
  24. Replies
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    Fan "on" low 24/7 is best for recirc and...

    Fan "on" low 24/7 is best for recirc and blinding of fresh air into the home. A fresh air change in 4-5 hours is suggest when the home is occupied. Cold, windy days naturally change even in a tight...
  25. Keep us posted. Regards Teddy Bear

    Keep us posted.
    Regards Teddy Bear
  26. There are dehus that are designed for grow rooms....

    There are dehus that are designed for grow rooms. They connect to the a/c systems and will maintain ideal growing conditions.
    This is a real science.
    800 533 7533 Mike Carr for a start.
    Or ...
  27. Replies
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    A 3 ton with an Ultra-Aire 70H or 98H with fresh...

    A 3 ton with an Ultra-Aire 70H or 98H with fresh air ventilation and a small dehu supply to the attic and mostly to the a/c supply. This will eliminate the mold and provide fresh filtered air...
  28. Replies
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    Attic with foamed deck? Closed or open cell foam?...

    Attic with foamed deck? Closed or open cell foam? Location of home?
    Is the home with no mold also a foamed attic?

    Any material that is colder than the dew point of the surrounding air will be...
  29. I think we covered this another post. Regards...

    I think we covered this another post.
    Regards Teddy Bear
  30. If you have health issues that are serious,...

    If you have health issues that are serious, consider adding fresh air ventilation to your central air handler. Also monitor the fresh air change rate and %RH levels in the home. In most green grass...
  31. Replies
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    Fresh, filtered air change every 4 hours when...

    Fresh, filtered air change every 4 hours when occupied and humidity control are critical to purge indoor pollutants, renew oxygen, and comfort. Basements are well sealed from wind and other natural...
  32. Important to use the dehu to circulate air in the...

    Important to use the dehu to circulate air in the home. If the home is duct for the a/c, a return from the the upstairs to the dehu return joined with fresh air duct would be a good start. A small...
  33. If you want fresh air control and %RH control,...

    If you want fresh air control and %RH control, using a separate control is simpler. Dehu fan on/off for mixing is also a benefit.
    If home is occupied 24/7 fresh air is ok. When home is routinely...
  34. I will post my thoughts later. I have a busy day...

    I will post my thoughts later. I have a busy day ahead. What gave you the idea about using whole house dehu? Also would you consider a unit made in the USA instead of China?
    Looking forward to the...
  35. I will post my thoughts later. I have a busy day...

    I will post my thoughts later. I have a busy day ahead. What gave you the idea about using whole house dehu? Also would you consider a unit made in the USA instead of China?
    Looking forward to the...
  36. Replies
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    Honeywells are made in China. The Ultra-Aire are...

    Honeywells are made in China. The Ultra-Aire are made in Madison WI. Hot attic ok for any of these dehumidifiers. The Ultra-Aire has 25 year history and tech leader for efficiency.
    The data is all...
  37. Replies
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    The dehu will not operate unless the %RH is above...

    The dehu will not operate unless the %RH is above the set point. I was talking about the fan only which will mix warm air from the home with the cold air from the a/c or if the dehu is needed warm...
  38. Replies
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    Insulating the dehu ducts like the a/c should be...

    Insulating the dehu ducts like the a/c should be good. The dehu supply into the a/c supply will reduce the a/c supply duct temperature when the dehu operated.

    I would operate the dehu fan 24/7,...
  39. Replies
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    I forgot to include the condensate removed per...

    I forgot to include the condensate removed per hour measured with a rain gauge connected to the a/c-dehu drain.

    813931

    During the evening hours the dehumidifier removes significant moisture....
  40. Replies
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    606

    Yes, I have a Ultra-Aire 98H on this house, extra...

    Yes, I have a Ultra-Aire 98H on this house, extra capacity if the a/c is setup right. This home is 2,500 sq.ft. plus 100 cfm of fresh fresh air with 2 occupants

    A well setup a/c will maintain...
  41. Replies
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    606

    Most evenings, the outdoor %$H goes to +90% when...

    Most evenings, the outdoor %$H goes to +90% when the temp drops. The outdoor dew points stay high. You should be ok when the outdoor dew points are below 50^F. Next spring get fresh air ventilation...
  42. A well setup a/c should keep the home

    A well setup a/c should keep the home <50%RH during peak sensiblecooling loads. The key the amount of air flowing through the cooling coil. Less air flow gets you a colder cooling coil and more...
  43. Replies
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    Assume you are in TX? What town? How many...

    Assume you are in TX? What town? How many occupants? Crawlspace and where are the supply duct located?
    Any fresh air ventilation?
    A/c fan auto or on?

    Cold weather snaps following moderate wet...
  44. My experience with a 6" is that wide open will...

    My experience with a 6" is that wide open will get you about 60-70 cfm of fresh air, thats minimum when occupied.

    But do what ever you want.
    You can always adjust.
    Looking forward to hearing...
  45. Here is data from the FL home. DEC in FL is like...

    Here is data from the FL home. DEC in FL is like Sept in the NE US.

    813879

    813880

    813881

    I would expect this type of moisture in your area in May through Sept.
  46. All that is left is for the contractor to get a...

    All that is left is for the contractor to get a good dehumidifier and installed ideally. ULtra-Aire is the pioneer of the concept and offers the best warranty. Also highest efficiency. Devolped in...
  47. Two dehumidifiers and HRV will improve the home. ...

    Two dehumidifiers and HRV will improve the home. During times of high sensible cooling, the a/c will remove the moisture from the fresh air and occupants. The two dehumidifiers sized right should...
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    CFM is a cubic foot of air per minute. A 2,500...

    CFM is a cubic foot of air per minute. A 2,500 sq.ft. home with 10 foot ceilings is 25,000 ft^3 and should have +100 cfm of fresh air change when occupied to remove the pollutants in the home and...
  49. Replies
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    It starts with avoiding damp spots in the home...

    It starts with avoiding damp spots in the home that grow mold and dust mites.
    This means <50RH throughout.
    The next is to have fresh filtered air passing through the home when occupied. Like a...
  50. Air natural gas makes the distribution of the...

    Air natural gas makes the distribution of the fresh dry air via the heating duct throughout the home easy. The dehu supply is routed to the heating duct with a return from the open part of the home...
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