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  1. My experience is that a properly sized a/c and...

    My experience is that a properly sized a/c and setting the stat up or off when routinely unoccupied, is practical in many settings and with many occupants. I do this with a FL house, It is unoccpied...
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    All the capacity loss is in the 20 ft. of flex...

    All the capacity loss is in the 20 ft. of flex duct, not the 4" hood.
    If you want a barn burner, get a 6X8 reducer and use 8" flex to the 4"Hood. At the 4" hood reduce the 8" down to 4". You get...
  3. http://www.fsec.ucf.edu/en/publications/pdf/FSEC-R...

    http://www.fsec.ucf.edu/en/publications/pdf/FSEC-RR-383-12.pdf

    Fl Solar research has various studies that will answer your question.
    Just a sample of some of their work.
    When you come up with...
  4. The fresh air's function is to keep the...

    The fresh air's function is to keep the pollutants from all of the materials in your from building up in your home and renew oxygen.
    During mild weather and temperatures, even leaky homes may only...
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    Now is also the time to consider adding...

    Now is also the time to consider adding supplemental dehumidification to handle the moisture from the occupants and infiltration/ventilation moisture air during evenings/rainy days when the a/c does...
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    Sure, a relay on the dehu fan circuit that closes...

    Sure, a relay on the dehu fan circuit that closes when ever the a/c-heating is used. But a better choice to operate the dehu fan whenever the home is occupied. There are many days when the dehu or...
  7. Basics are to connect the dehumidifier to draw...

    Basics are to connect the dehumidifier to draw house air from the open part of the home through the dehumidifier filtering/drying and supplying to the a/c supply duct, supply the dry air throughout...
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    Disconnect from the cold air return and connect...

    Disconnect from the cold air return and connect to the Ultra-Aire, Turning the dehu blower on will get you fresh air mixed will house air when the dehu fan runs. Run the dehu fan when the home is...
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    Sorry I posted on the you other post. Any chance...

    Sorry I posted on the you other post.
    Any chance you could email me the name of the contractor involved? I would like more details on all of that. We prefer to deal with wholesale/ac contractors as...
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    This is fine kittle of fish. May be it is time to...

    This is fine kittle of fish. May be it is time to lower your standards. If you can a good contractor to install a lessor dehumidifier correctly, it would be better than times of high humidity.
    Or...
  11. The highest air to the bedroom is with the door...

    The highest air to the bedroom is with the door open. Door closed with air dam is the least amount of supply. You are pressurizing the space forcing more air into the return and out through any...
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    Cantact Justin in customer service at Ultra-Aire...

    Cantact Justin in customer service at Ultra-Aire for details adjusting
    controller. 800 533 7533.
    It is important that not in a high temperature area which will lower the %RH reading. Make sure...
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    After checking the a/c functions, mainly the...

    After checking the a/c functions, mainly the refrigerant charge/expansion devide and air flow at the condenser, adjust the cooling coil air flow to get the desired coil temperature which controls...
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    Warmer rises putting a positive pressure on the...

    Warmer rises putting a positive pressure on the upper skin of the home. As air leaks out, a negative pressure on the lower level of the home. It is called the stack effect. Also winds are higher...
  15. There are many, a few on this site, that are...

    There are many, a few on this site, that are better qualified then me help you with the problem. If I got it wrong, I would feel bad. I have my hands full with these conditioning and air quality...
  16. Ok then, I will open this can of worms. The...

    Ok then, I will open this can of worms.

    The source of all the moisture in your home is the life saving infiltrating fresh air and the occupants, Usually. If you are lucky you get a fresh air...
  17. One floor or basement with open doors is doable. ...

    One floor or basement with open doors is doable.
    Between floors or closed doors requires circulation. This is the reason for connecting to the central duct work.
    For some basement settings,...
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    Good comments from your a/c guy except one. The...

    Good comments from your a/c guy except one.
    The actual moisture contact in your basement air the same as the main floor.
    Here is how it works, your air handler mixes and circulates all the air in...
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    Your fresh air when the a/c blower runs? No...

    Your fresh air when the a/c blower runs? No cooling, no fresh air?

    Re-route the fresh air to the dehumidifier return and operate the fan on the dehu when the home is occupied or 24/7. You could...
  20. The sq. ft. is a conservative estimate. Quality...

    The sq. ft. is a conservative estimate. Quality construction and lower dew point climate give us an option controlling more space. The materials in the home are a flywheel. This is why many get by...
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    I agree with you about make-up air for bath fans,...

    I agree with you about make-up air for bath fans, kitchen hood, and cloths drier plus wind caused infiltration/exfiltration.
    The latent cooling load is dependent the cfm and dew point of the...
  22. The amount of duct pressure that dehus can handle...

    The amount of duct pressure that dehus can handle depends on the unit. At .6" WG duct pressure air flow slows but the dehu functions with less capacity. This occurs when the a/c is functioning or...
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    Yes a HEPPA filter would be better. Smoke is...

    Yes a HEPPA filter would be better. Smoke is better removed by a Carbon filter is used.
    Also most important is a fresh air change if 4-5 hours and maintaining <50%RH to avoid mold and dust mites in...
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    Ok. An update: finally found HVAC Well, Im...

    Ok. An update: finally found HVAC

    Well, Im still on track to order that XT155H unit and work with those guys. But before I sign with them I'd like your input on the BEST possible install for my...
  25. With almost 5,000 sq.ft. home and part of that...

    With almost 5,000 sq.ft. home and part of that basement, the 155 pint Ultra-Aire has a very high 8 pints per kwh efficiency. The 70h U A is 4.5 pints per KWH.
    If the 155 can be ducted to both a/cs,...
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    A lot of good info so far. The biggest problem...

    A lot of good info so far. The biggest problem is that you now know the %RH. put a piece of tape over the meter. Just kidding.

    Fan "auto" mode during short cycle cooling loads you will have the...
  27. ASHRAE suggests 40%-60%RH as a range. Beyond that...

    ASHRAE suggests 40%-60%RH as a range. Beyond that it is a personal issue. The biggest issue for some maybe "too expensive". The fact remains lower %RH means less sensible cooling because of...
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    You are getting some good advice. An a/c running...

    You are getting some good advice. An a/c running +60% of the time setup ideally to max moisture removal should maintain 50% RH on the main floor. In the basement which is cooler than the main floor ...
  29. Is this a great bunch of guys or what! 40%RH...

    Is this a great bunch of guys or what!

    40%RH is aggressive humidity control, what is the temperature you want? This will determine the require size of the dehumidifier. Let us use 75^F, 40%RH is...
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    Your original question was on the Ultra-Aire...

    Your original question was on the Ultra-Aire XT105H. On your sized home, this unit should do well and provide <50%RH throughout your home. If your fresh air was +100 cfm and it was important to not...
  31. Thread: My Home

    by teddy bear
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    I must compliment you on a trim installation....

    I must compliment you on a trim installation. Also you sure know hour to make a "Teddy Bear" happy and thank you!
    How are you going to connect the Ultra-Aire into the a/c?
    What is your fresh air...
  32. Well here goes. As you are finding out, return...

    Well here goes.
    As you are finding out, return to return as limitations. You can not dehumidify while air conditioning because the dry warm air from the dehumidifier reduces the a/c dehumidification...
  33. ON a hot day, a properly setup a/c will maintain...

    ON a hot day, a properly setup a/c will maintain <50%RH during peak cooling loads. 3/4 of a properly setup a/c removes heat. The rest of the cooling removes moisture, providing the <50%RH. A 3 ton...
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    The temp above the cooling coil should be 54-56^F...

    The temp above the cooling coil should be 54-56^F for good sensible cooling rate. Typically more air flow = increased capacity less latent and more sensible. I would 10% increase. Route that air to...
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    The Ultra-Aire 120H will work by will more short...

    The Ultra-Aire 120H will work by will more short cycling during part load conditions. We are estimating your load with any measurements. Slight over-sizing is acceptable to the manufacturer.
    During...
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    The target is the lowest humidity you want. ...

    The target is the lowest humidity you want. Sounds like 50%RH is the starget. If you slowed the a/c air flow and got to 48%RH, the smallish dehumidifier will slowly rise to 50%RH. This would be...
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    Looks like you doing well compared to most...

    Looks like you doing well compared to most others. During high temperature like +90^F your a/c should maintain <50%RH provide not many fish tanks, normal occupancy and air tight ducts.
    Slowing the...
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    PS. could also be duct leaks as other have said....

    PS. could also be duct leaks as other have said. I am attaching a dew point map. Houston was 76^F, really wet!809205
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    You may not want to hear this but. This a classic...

    You may not want to hear this but. This a classic problem that can teach us lot.

    The a/c must be setup to max the moisture removed on its own during high cooling loads. You mention the most...
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    Sorry to hear about out of stock. If you do not...

    Sorry to hear about out of stock. If you do not mind an occasional 55%RH, the Ultra-Aire 70H will work.
    If you want agressive humidity control, wait for the 98H.
    Keep us posted.
    Regards Teddy...
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    To think properly, remember that 90^F, 60% is...

    To think properly, remember that 90^F, 60% is much wetter than 75^F,60%RH.
    The outdoor dew point is 75^F, while the indoor is 60^F is 60^F dew point. the dew point difference is your concern, The...
  42. All this sounds normal. If mold grows at the...

    All this sounds normal. If mold grows at the bare metal in the attic under the insulation, wrap the bare metal with foam rubber insulation to avoid condensation on the cold surface.
    Measure the %RH...
  43. Measure the return and supply temp/%RH at the...

    Measure the return and supply temp/%RH at the coldest grills during both modes. Also you may need time to dryout the homes structural materials. This could take a couple weeks. Avoid over-cooling...
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    To be honest, I am a past full time employee of...

    To be honest, I am a past full time employee of the manufacturer of Ultra-Aire. We manufactured dehus for some of the companies you mentioned. We have been making dehus in Madison WI since 1992. ...
  45. https://santa-fe-products.com/products/dehumidifie...

    https://santa-fe-products.com/products/dehumidifiers/compact70/

    https://santa-fe-products.com/pdf/Santa_Fe_Compact70_Manual.pdf

    I would keep the dehumidifier in the basement space. Connect a...
  46. The Santa Fa Compact 2 is a good choice. They...

    The Santa Fa Compact 2 is a good choice. They also have crwalspace monitoring and condensate pump accessories.
    https://santa-fe-products.com/products/dehumidifiers/compact70/
    The vents must be...
  47. After the tech get the a/c removing sensible heat...

    After the tech get the a/c removing sensible heat properly, suggest that he check the cooling coil for max moisture removal. You want the cooling a minimum of 30^F colder than the return air...
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    If you only want to control the %RH, the Nest...

    If you only want to control the %RH, the Nest will if it has a %RH relay, connect to the Nest with wires from the dehumidifier to desire Stat.
    If you want to bring in fresh air on a schedule or...
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    Of course the refrigerant change must be...

    Of course the refrigerant change must be adequate. The temperature of the coil temperature is a function of the amount ofair flowing through it. Slowing the air flow lowers the coil temperature.
    If...
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    Ducting sounds good. One return from the open...

    Ducting sounds good. One return from the open part of the home to the dehumidifier upstairs or downstairs ok. Splitting the dehu supply between the two a/c supplies with the check damper-OK.

    Do...
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