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  1. Your a/c cooling coil gets enough to condense...

    Your a/c cooling coil gets enough to condense moisture from the home as cooling occurs. After `20--30 mins of cooling, the moisture drips in the pan and goes down the drain. This continues until...
  2. Poll: If you are happy, we are happy. I get more...

    If you are happy, we are happy.

    I get more aggressive when you know what you want and are not getting it.

    Personally, in green grass climates with generally high outdoor dew points, expect your...
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    The cooling coils of the a/c must be cold enough...

    The cooling coils of the a/c must be cold enough to remove enough moisture to maintain <50%RH inside the occupied space.

    example:
    24^C, 50%Rh, a 13^C dew point must have a dew point <10^C dew...
  4. I am concerned about your upstairs a/c setup. A...

    I am concerned about your upstairs a/c setup. A whole house dehumidifier will not make up for a less than ideal setup a/c. During long sensible cooling runs, the upstairs a/c must do it's share of...
  5. Is there a basement or crawlspace? With more...

    Is there a basement or crawlspace?

    With more of humidity problem on the second floor, make sense to connect the dehumidifier supply to the a/c supply for the second floor. Fresh air from outside...
  6. The good news is that your a/c is making cold...

    The good news is that your a/c is making cold enough air to cause condensation on the grills. During long cooling runs, your indoor dew point should be low enough to not have condensation.
    ...
  7. The ULtra-Aire 70 H has collars with either...

    The ULtra-Aire 70 H has collars with either remote ready or attached dehumidistat. Higher static fan slightly lower efficiency. Ether will handle the space. No provision for a remote dehumidistat...
  8. The fan power of the Ultra-Aire 70H with the...

    The fan power of the Ultra-Aire 70H with the self-contained dehumidistat is adequate for ducting and through walls. The UA 98H does not have a self-contained dehumidistat and needs a remote control....
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    The important issue is fresh, filtered air change...

    The important issue is fresh, filtered air change when the home occupied. This will purge indoor pollutants and renew oxygen. Fresh air change occurs when the wind blows and stack effect occurs. ...
  10. The return to the dehumidifier is best to routed...

    The return to the dehumidifier is best to routed from the open part of the home and a 6" fresh air inlet from outside. The dehumidifier supply is routed to the a/c supply and 6" max with damper to...
  11. Conecting the dehumidifier to a return and...

    Conecting the dehumidifier to a return and connecting the dehumidifier supply to will require the furnace blower toavoid the dry air from the dehumidifier from going back the dehumidifer without...
  12. Cooling indoor space below outdoor dew points...

    Cooling indoor space below outdoor dew points causes condensation on any material below the outdoor dew point. Dry wall in the attics and exterior walls will grow mold after 24 hours of near...
  13. So you have a duct system that is designed to...

    So you have a duct system that is designed to provide good distribution at a specific air flow, as the cooling declines, the air flow slows. The distribution of the conditioned air changes. Cooler...
  14. Suggest having the refrigerant checked. As dehus...

    Suggest having the refrigerant checked. As dehus approach 10 years, chances are the cooling coil has a leak. This coil can be replaced. May be just as practical to replace with a new unit.

    If...
  15. I would suggest the Ultra-Aire 70H. This unit...

    I would suggest the Ultra-Aire 70H. This unit has 8"ducts with attached dehumidistat or remote connection. Long warranty and available on the internet or wholesale.
    Similar to the Santa Fe.
    ...
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    It I had dehumidified crawlspace that was dry,...

    It I had dehumidified crawlspace that was dry, way would you want to suck wet outside air into the space?

    Moisture will make the dehumidifier run more or what?

    Post his answer.

    Regards Teddy...
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    House: 72.0F, 54.8% RH, 54.9Ftd, 61.3Fwb...

    House: 72.0F, 54.8% RH, 54.9Ftd, 61.3Fwb ==55^F dew point

    Supply 1: 56.4F, 70.8% RH, 47.1Ftd, 51.2Fwb == 47^F dew point= only a/c if 1,000 cfm 7.4 lbs.per hour

    Supply 2: 63.7F, 60.0%RH,...
  18. I am attaching a maked-up drawing that assumes...

    I am attaching a maked-up drawing that assumes that the T-stat has relays which stated in the install from Aprilaire. I have never connected an Aprilaire stat. Caution.

    This uses the Ultra-Aire...
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    Thanks for the update. Put a whole house...

    Thanks for the update. Put a whole house dehumidifier (Ultra-Aire) with filtered fresh ventilation.

    Nice job on locating a good contractor to get a good setup. A home with good ventilation in...
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    OK, need the %RH and the temp from the home and ...

    OK, need the %RH and the temp from the home and the a/c supply. There is about +300 cfm of conditioned air coming from the a/c supplies because of the dehumidifier by-pass throughout the home. It...
  21. This is much more cost effective and provides...

    This is much more cost effective and provides real humidity control than over-cooling. Controls mold and dust mites. A KWH removes 4-8 lbs. of moisture and provides 12,000 btus of reheat. This is...
  22. All good questions. CO2 control is a biggy. ...

    All good questions. CO2 control is a biggy. This will reduce fresh air cost by 50%.UNoccupied, windy, and high stack effect over ventilation are all avoided.

    Keep us posted.

    Regards Teddy Bear
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    Yes, there an additional 300 cfm of air flowing...

    Yes, there an additional 300 cfm of air flowing through the duct because the dehumidifier supply blowing into the a/c supply as well as the a/c. 300 cfm more dry air means more moisture removed. A...
  24. That what you are looking for. The a/c handles...

    That what you are looking for. The a/c handles the latent cooling load during design cooling load because of the long runs. As the evening temps decline the a/c runs less, while latent load...
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    The a/c supply temp/%RH is about right for an a/c...

    The a/c supply temp/%RH is about right for an a/c only operation of a/c only. With a/c and dehumidifier running, I would lower dew point

    at the supplyl824887

    Regards Teddy Bear
  26. Dehumidifier is off. 824886 Regards Teddy...

    Dehumidifier is off.

    824886

    Regards Teddy Bear
  27. Here is the ideal way to connect a dehumidifier...

    Here is the ideal way to connect a dehumidifier to a a/c ducted into a home.

    824884

    ATTACH=CONFIG]824885[/ATTACH]

    Much to gain with this type of install.
    When the a/c is not maintaining the...
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    Sorry about the confusion. I am attaching a...

    Sorry about the confusion.
    I am attaching a layout with the typical temps/RHs.

    Tell us one more time what your a/c supply temp-%RH.

    Regards Teddy Bear824852
  29. Stop heating the space will raise the indoor %RH....

    Stop heating the space will raise the indoor %RH. If this is unacceptable, checkout the commercial humidifiers like Aprilaire.

    Regards Teddy Bear
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    Blowing dry air from the dehumidifier into the...

    Blowing dry air from the dehumidifier into the a/c duct ahead of the cooling coil causes the a/c coil to remove less moisture equal to the amount the dehumidifier removes. The supply from the...
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    I am concerned that the dehumidifier supply must...

    I am concerned that the dehumidifier supply must not go to the a/c return before the cooling coil?


    Thanks again for your effort.
    REgards Teddy Bear
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    Where is the the a/c supply temp/%RH? Regards...

    Where is the the a/c supply temp/%RH?

    Regards Teddy Bear
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    Put closed cell foam on the drain from the...

    Put closed cell foam on the drain from the dehumidifier, You can buy closed foam tubing and cut to fit from the dehu to the a/c connection. What is the a/c return and supply temp/%RH?

    After we get...
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    Need a/c return temp/%RH info. Regards Teddy...

    Need a/c return temp/%RH info.

    Regards Teddy Bear
  35. Certainly, cooling a building removes heat and...

    Certainly, cooling a building removes heat and moisture. On a 90^F day cooling a large warehouse down to 75^F, should get you 50%RH during peak heat. The peak dew point may be 70^F. As the sun...
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    So the dehumidifier is independent of the a/c,...

    So the dehumidifier is independent of the a/c, right? If so measure the air temp/%RH being sucked into the dehu and the temp/%RH dehu supply.

    Do the same for the a/c, temp/%RH in the home or at...
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    Add the dehu location and duct connections to the...

    Add the dehu location and duct connections to the above drawing. We need temp/%RH in the home and at the a/c supply while cooling. How much water is removed by the dehumidifier per hour.

    The...
  38. An air change in 4 hours is considered minimum by...

    An air change in 4 hours is considered minimum by many. "When occupied" may also be part of this. Many use a CO2 meter to activate ventilation.

    Placing a small whole house dehumidifier in the...
  39. Do you have exhaust devices like clothes drier,...

    Do you have exhaust devices like clothes drier, kitchen hood and bath fans? In homes with common walls with other units, suggest using filtered make-up air for to avoid sucking in more soil gas and...
  40. It all starts with a good setup after the...

    It all starts with a good setup after the install. Proper air flow may lengthen the cooling cycle. How about the temp/%RH at the return and supply ducts grills?

    Keep us posted.

    regards Teddy...
  41. What is the temp/%RH at the return grills and...

    What is the temp/%RH at the return grills and supply grills? At the end of an afternoon steady cooling, what is the temp/%RH in the open space?

    A cold a/c supply is an important part of providing...
  42. With the fan in "auto", no fan unless cooling,...

    With the fan in "auto", no fan unless cooling, expect the a/c coil/pan to dry to the home in about 90 mins. Fan "on" low, expect drying to house in about 45 mins. On a vertical coil, there is about...
  43. How air tight is the structure? Location? outside...

    How air tight is the structure? Location? outside air dew point?

    If you can those question, an engineer can figure out the amount of equipment that is needed.

    Where in God's green earth is this...
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    I would suggest using make-up ventilation in an...

    I would suggest using make-up ventilation in an effort to supply positive air pressure to aid the open combustion devices while exhaust devices are operating in the the space. Be generous with the...
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    If all of your measurements are accurate, you...

    If all of your measurements are accurate, you should be removing about 1 lb. of moisture per hour per 300 cfm of air flow. This could take a couple hours to load a coil/pan to the point that you...
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    Another slant on the what to expect from adding a...

    Another slant on the what to expect from adding a dehumidifier to an home and what is going to happen?

    First of all what is the problem. Certainly the moisture is to high, right.

    If the...
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    With this crude way of measuring, not sure much...

    With this crude way of measuring, not sure much is happening. Remember occupants add a little moisture to the air in the home. The air in the home is constanly slowly being replaced by outside air...
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    Forget about the %RH, the moisture content of the...

    Forget about the %RH, the moisture content of the air is measured by dew point or lbs. of moisture per lb. of air or grains moisture per lb. of air. 7,000 grains of moisture per lb. of moisture...
  49. Your latent load is +6,000 btus at design...

    Your latent load is +6,000 btus at design conditions. This about 6 lbs. of moisture per hour that the a/c remove while cooling high sensible loads. Keep in mind when the sun sets and on rainy day,...
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    Nothing wrong with your a/c. With 90^F, 20%RH...

    Nothing wrong with your a/c.

    With 90^F, 20%RH outside, cooling down to 53^F, 80%RH, a 46^F means you added a couple degree of dew points. This is the effect of breathing in space. The indoor dew...
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