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  1. Keep us posted. Regards Teddy Bear

    Keep us posted.
    Regards Teddy Bear
  2. 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 ...
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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...
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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...
  5. I think we covered this another post. Regards...

    I think we covered this another post.
    Regards Teddy Bear
  6. 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...
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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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
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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...
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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...
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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,...
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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....
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    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...
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    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...
  18. 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...
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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...
  20. 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...
  21. 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.
  22. 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...
  23. 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...
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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...
  26. 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...
  27. Lets not jump into anything Monitor %RH with...

    Lets not jump into anything Monitor %RH with agressive fan use in the baths and window cracking will get u by until a solid plan can be developed. I assume that you have electric heat in each room...
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    Furnaces have specific needs for air flow to...

    Furnaces have specific needs for air flow to avoid overheating. A/c air flow is adjusted to provide ideal moisture removal. They may be different.
    Keep us posted.
    Regards Teddy Bear
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    In a green grass climate like the Midwest,...

    In a green grass climate like the Midwest, consider a small whole house dehumidifier to maintain <50%RH to avoid musty odors and mold. At a minimum monitor the %RH and avoid +50%RH for extended...
  30. Ok, now the hard part, get the dehu installed...

    Ok, now the hard part, get the dehu installed correctly. You will need a 6" fresh air inlet comming from an area free of pollutants, like car paring and clothes drier exhausting.
    Also, you need a...
  31. Ok,

    Ok, <50%RH controls mold and dust mites. +60%RH grows dust mites and mold. You need fresh air change in 4-5 hours when occupied, it is raining for a couple days with a 65^F dew point outside. ...
  32. Your contractor passed the "blow test"! You...

    Your contractor passed the "blow test"! You really do not have a clue on humidity control. The ERV will not remove any moisture when the outdoor dew point is at or above your indoor dew point. In...
  33. Here is the good news, you have an air tight...

    Here is the good news, you have an air tight home, which is important when trying to maintain a healthy comfortable home.

    The main benefit is that your home will not over-ventilate during wind and...
  34. The DEH 3000 cycles the fan every 3 hours to mix...

    The DEH 3000 cycles the fan every 3 hours to mix up the air for 15 mins.?? The compressor should operate during the mixing cycle.
    Keep us posted.
    Regards Teddy Bear
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    The Ultra-Aire 98h has a merv 13 as the standard...

    The Ultra-Aire 98h has a merv 13 as the standard filter for fresh air and return air from the home.
    The return air from the open part of the home should be located in space without a door that is...
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    Consider the whole issue about indoor air...

    Consider the whole issue about indoor air quality. Mechanical fresh air of an air change in 4-5 hours assure purging of all chemicals and the renewal of oxygen. Even if chemicals are not present,...
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    My guess is that you get plenty of fresh air...

    My guess is that you get plenty of fresh air change during cold weather and a little wind. Mainly the stack effect makes the house fresh air infiltration increase. Calm wind and mild temperatures...
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    Most deep basements in green grass climates need...

    Most deep basements in green grass climates need a good dehumidifier more than an a/c.
    What is your climate. Basements are a little on the cool side unless you have high activity.
    I would duct in...
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    How about using the old return space near the...

    How about using the old return space near the floor with the duct going to the dehumidifier. The dehu supply goes to the a/c supply duct down stream of the a/c cooling coil. Fresh air goes to the...
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    You may have a damp spot in the drain pan under...

    You may have a damp spot in the drain pan under the a/c coil. Recheck the draining of the pan, level without a wet corner.
    Now that you have reduced the fresh air passing through your home by...
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    Best to have an independent return from the open...

    Best to have an independent return from the open part of the home to the dehumidifier. This assures good mixing of the dry air throughout the home via the a/c supply/dehu supply.
    Most new a/c...
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    Sofit vents are intakes also and therefore a...

    Sofit vents are intakes also and therefore a fresh air intake can be in the open sofit. Bathfans, kitchen hood and clothes drier need to be +3 ft. from the fresh air intakes. Also avoid car parking...
  43. Any surface temperature below the dew point of...

    Any surface temperature below the dew point of the surrounding air will have condensation. Your insulation has a poor or no vapor barrier on the warm side of the insulation. 0^C duct surface with...
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    Crack a window any time the condo is occupied...

    Crack a window any time the condo is occupied during calm winds to get fresh air change.
    The effect on the inside moisture level depends on the outdoor dew point.
    An example is 40^F, 100%RH a...
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    Or crack a window! Regards Teddy Bear

    Or crack a window!
    Regards Teddy Bear
  46. Replies
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    The %RH inside your space is dependent on the...

    The %RH inside your space is dependent on the amount of moisture in the outside infiltrating fresh air plus the moisture the occupants add minus the moisture removed by your a/c.

    Outdoor air in...
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    Nat gas is cheapest heat source if available....

    Nat gas is cheapest heat source if available. Single speed a/c or heat pump combined with the dehumidifier/fresh air will keep the home dry enough to avoid mold/dusts and be very comfortable.
    Keep...
  48. Climate of the home is the location. If a...

    Climate of the home is the location.
    If a basement or crawlspace is kept dry and free of polluted materials, the air can be mixed. In fact, when the wind blows and the air handling equipment mix all...
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    A good air filter should have no effect on the...

    A good air filter should have no effect on the ducts size. The ULtra-Aire 98H connected to the a/c supply could increase the air passing through the supply ducts to the home. The ideal UA install...
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    Cool mist humidifiers require a good air filter...

    Cool mist humidifiers require a good air filter down stream to remove the solids left in the air after evaporation of liquid water. We are talking high merv filters +11. Steam humidifiers leave the...
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