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  1. Replies
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    The structures are stronger and tighter with...

    The structures are stronger and tighter with windows to match. The air change is continuing to decrease. Indoor air quality has been declining because of the lack of natural air change when...
  2. Put a small (50 pint) dehumidifier set at 50%RH...

    Put a small (50 pint) dehumidifier set at 50%RH when not occupied and closed up.

    Regards Teddy Bear
  3. Replies
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    Poll: The main message is keep the space dry to control...

    The main message is keep the space dry to control biological growth. 40 cfm plus natural ventilation is better than most.
    Glad that the problem is solved. Ok maybe I got a little handed on my...
  4. Welcome to a real green grass climate. FL...

    Welcome to a real green grass climate. FL construction with cement block/stucco plus good windows is very air tight anytime the wind is moderate to calm. Good indoor air quality calls for a fresh...
  5. Thread: AC Humidity

    by teddy bear
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    399

    A more restrictive air filter and slowing the...

    A more restrictive air filter and slowing the blower speed are the typical changes suggested to slow air flow. The pan should be pitched to avoid any standing water. The moisture collects on the...
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    Poll: Lets not get too excited without a couple years...

    Lets not get too excited without a couple years of typical year around weather before we celebrate. Normal homes with moisture generating occupants and occasional damp weather systems need time...
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    Super tight homes with a clothes drier, kitchen...

    Super tight homes with a clothes drier, kitchen hood, and a couple of bath fans need +150 cfm of make-up air to function. Start with 150 cfm air for the exhaust devices. The cost to heat 150 cfm is...
  8. Thread: AC Humidity

    by teddy bear
    Replies
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    399

    A/c removing sensible heat raises the %RH. %RH is...

    A/c removing sensible heat raises the %RH. %RH is not the measure of moisture content. And example is a 2,000 sq.ft. with 10 ft. ceilings space at 75^F, (24^C), 60%RH, 60^F (15^C) dew point needs 3...
  9. IN the final adjustment, air flow +- to get the...

    IN the final adjustment, air flow +- to get the 30^F cooling coil below return air temperature for a 50%RH in the space. This surest way to get humidity control. During evenings and rainy days...
  10. Keep in mind that these Santa Fe remove more...

    Keep in mind that these Santa Fe remove more moisture per watt than the cheap units. I agree that some of these components to do not last as we wiis. Copper cooiling coils have be short lived and...
  11. Close enough to do the job you have. Operate...

    Close enough to do the job you have. Operate when occupied except during very cold windy weather. Most homes get more than enough ffresh air during the windest cold weather.
    On the other hand,...
  12. There is a bug in there some place. These are...

    There is a bug in there some place. These are complex systems. My experience has been good these units has been good. Your contractor/mfg. are working on the the unit. When they find the problem,...
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    The return from the home to the dehumidifier can...

    The return from the home to the dehumidifier can be any from any place in the home with a 6" fresh air return from outside also into the dehu return. The dehu supply should be to the a/c supply down...
  14. What are your indoor air quality problems? You...

    What are your indoor air quality problems?

    You could make some changes to install but nothing major jumps out except negative pressure in your basement. With all of the exhaust equipment you...
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    Dehumidification is not needed during outside...

    Dehumidification is not needed during outside freezing because of low outdoor dew points and increased movement of dry outside air through the home. Pull the plug on the dehu Nov. The idea of...
  16. You and your family are obviously resistant to...

    You and your family are obviously resistant to mold problems, most are.

    What is the temp/%RH in the home and are the a/c supply while running?

    If you are happy, so am I. 10-15% of the...
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    In reality, you expect this a/c to maintain...

    In reality, you expect this a/c to maintain maintain <50%RH with 75^F t-stat setting??

    if yes on the 50%RH at a minimum, the air flow through the cooling coil must be slowed to <320 cfm per ton...
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    What is the climate? None of these system will...

    What is the climate? None of these system will maintain 50%RH during rainy days and cool damp evenings.
    Any fresh air ventilation on the home?
    Even a slightly over-sized a/c should maintain...
  19. Here a couple things that are not considered. ...

    Here a couple things that are not considered. Humidity control is dependent on the amount of fresh air entering the home, dew point of the fresh air, and the number of occupants verse the moisture...
  20. This is sad situation in many ways. A foam home...

    This is sad situation in many ways. A foam home in a mild climate with human occupants without a whole home dehumidifier is going to suffer from a couple comfort and health problems.
    All homes...
  21. My experience says that moist important is...

    My experience says that moist important is finding and eliminating the damp spot that is growing the biological material generating the odor. Clean the coil and pan with a cleaner. Pitch the pan...
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    Yes, a normally open relay that is closed by the...

    Yes, a normally open relay that is closed by the hood fan voltage will activate the dehu fan and open a damper if needed by using a double relay.

    I am attaching maked up drawing.

    Regards Teddy...
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    The rest appears ok. I do not have a problem...

    The rest appears ok.
    I do not have a problem with the make-up air plan opening window during occasional heavy duty the cooling.

    Keep us posted on issues and results.

    Regards Teddy Bear
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    Our last paragraph sounds ok if return from the...

    Our last paragraph sounds ok if return from the house is dampered off when max make-up is needed.

    Keep us posted.
    Regards Teddy Bear
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    Ultra-Aire 98H needs a return from the open part...

    Ultra-Aire 98H needs a return from the open part of the home and a fresh air connection. The supply of the Ultra-Aire should be connected to the a/c supply.

    Is the Aprilare a humidifier,...
  26. A comment on "enough air leakage". During windy...

    A comment on "enough air leakage". During windy weather and some stack effect, you get enough fresh air. During calm, mild weather, even leaky homes may only get a fresh air change in 12 hours...
  27. Replies
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    Think in terms of dew point of the air outside...

    Think in terms of dew point of the air outside and inside the home when considering moisture content of the air. Also occupants add moisture to the space when present

    .818966

    A dehumidifier...
  28. Any of the coil leaks have involved coil...

    Any of the coil leaks have involved coil corrosion not pressure failure. The UL codes have high safety pressure factors.
    Chemicals in the air are one of the causes.
    Is there fresh air provided as...
  29. We expect a 10^F drop in dew point as the air...

    We expect a 10^F drop in dew point as the air passes through the dehumidifier with a 75^F, 50%RH, a 55^F dew point. Supply temps like 90-95^F, <20%RH, 46^F dew oint.

    4lbs. of dehumidificqtion...
  30. Air flow requirements are similar per ton of...

    Air flow requirements are similar per ton of cooling. More air flow through the cooling coil increases the sensible cooling ratio and slows latent cooling. Increasing supply and return air to an...
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    Undersized ducts leads to slow sensible cooling...

    Undersized ducts leads to slow sensible cooling and high latent cooling. The results will be very cold, low dew point a/c supply air.
    Not high %RH!!!!
    Regards Teddy Bear
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    Here is a packet of %RH/temp meters from Amazon...

    Here is a packet of %RH/temp meters from Amazon for a few bucks. You can attach them to return/supply grills/key areas of concerned to be able to report back real temp/%RH so we can advise you and...
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    We can help, but need more info. During a...

    We can help, but need more info.
    During a significant cooling run, measure the temp/%RH in the space and at the closest a/c supply. What kind of dehu do you use?
    Fresh air ventilation?
    Regards...
  34. Easy to add a small whole house dehumidifier to...

    Easy to add a small whole house dehumidifier to conditioning ducts. In your case, are there any? If no, I would by finding a space that you could locate the dehumidifier in a closet or laundry room...
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    Where is the mold growing?? Is it a cold surface?...

    Where is the mold growing?? Is it a cold surface? Insulating the cold spots with a a closed cell foam with an adhesive on the cold surface. The dew point of 76^F, 67%RH is a 62^F dew point. Any...
  36. Replies
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    How can you get fresh air into a home without...

    How can you get fresh air into a home without mold problems?? Do not introduce the damp fresh air into a cold a/c closet. Suggest mixing the damp air with dry house air before bring it into the...
  37. Replies
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    Ask the question. How much moisture is my a/c...

    Ask the question. How much moisture is my a/c removing from the air when it is running?? Temp/%RH?dew point of the air into the a/c coil and out?
    Example:75^F/60%RH/60^F dew point in (if working...
  38. Replies
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    Do what you must to eliminate long term wet...

    Do what you must to eliminate long term wet spots!! Also a couple hours dry time each day stop the odor related problems. Long term enough fresh air to purge indoor pollutants and renew oxygen plus...
  39. A well setup a/c will maintain 50%RH during peak...

    A well setup a/c will maintain 50%RH during peak sensible cooling loads. The setup adjust the amount of moisture the a/c will remove. The amount of moisture removed is controlled by amount of air...
  40. Hope you make a pitch for your favorite...

    Hope you make a pitch for your favorite contractor to try the Ultra-Aire equipment. We pioneered this concept stating in the late 90's. Honeywell and Aprilaire are also old timers in filters and...
  41. With chemical sensitivities, you are unique. I...

    With chemical sensitivities, you are unique. I would suggest a minimum of 3 air changes an hour. This is 166 cfm of fresh filtered air. With a 75^F outdoor dew point during a warm rainy day and the...
  42. Just spray a couple of inches of closed cell foam...

    Just spray a couple of inches of closed cell foam to the underside of the roof boards??
    Regards Teddy Bear
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    Measure temp/%RH at the closest supply to the...

    Measure temp/%RH at the closest supply to the a/c. Would be nice to measure temp/%RH any return grill.

    Regards Teddy Bear
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    Fan, auto or on? Need Supply temp/%RH is...

    Fan, auto or on?

    Need Supply temp/%RH is critical in commenting on the a/c's function!!!s

    During the design outdoor load conditions, like 92^F, 50%RH, a 70^F dew point, cooling load, a properly...
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    Poll: Controlllng musty odors are more dependent on low...

    Controlllng musty odors are more dependent on low %RH than ventilation. Maintain %RH low enough to prevent mold growth is the key. This also includes damp spots that may be more about water leakage...
  46. Thank you for the chance to provide equipment. ...

    Thank you for the chance to provide equipment.

    Nothing wrong with threaded rod hanging of dehu. Contractors prefer because they have on hand, no problem.

    Pan is a good idea if you are concerned...
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    Poll: LIke peeing on a forest fire! You need a fresh...

    LIke peeing on a forest fire! You need a fresh air change in 4-5 hours minimum. ERVs will reduce a small amount of moisture in fresh air provided the exhaust air is dry. This is nice but will not...
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    Keep us posted on how it all works. I would...

    Keep us posted on how it all works. I would keep the a/c simple as possible. Add fresh air and supplemental dehumidification after you prove the need by monitoring indoor Temp/%RH/CO2 levels.

    I...
  49. Get a temp/%rh meter from Amazon for

    Get a temp/%rh meter from Amazon for <$10. Hold it in front of the a/c supply and return for results. You should do this to see how well your system is working. The room target is 75^F, 50%RH with...
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    After a few years of trying different devices, I...

    After a few years of trying different devices, I have gone back to measuring CO2 levels to assure adequate fresh, filtered air change rate when the space is occupied.
    I setup mechanical fresh...
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