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  1. Welcome! Glad to hear you have fresh air...

    Welcome!
    Glad to hear you have fresh air ventilation and a well insulated home.
    You need a couple more things.

    Start with a properly functioning and setup a/c.
    On hot day where the a/c is...
  2. It is amazing how difficult it is to be a good...

    It is amazing how difficult it is to be a good customer or service provider. We all say or do things that are mis-understood and we react.

    Now throw in a high tech piece of equipment which many...
  3. You are on the right track. %RH is the other...

    You are on the right track. %RH is the other part. Avoid +60%RH to control mold and dust mites.
    What is your climate?
    Regards Teddy Bear
  4. Glad to here that you have a

    Glad to here that you have a <50%RH with fresh air.
    Ideally, you need a fresh air change in 4-5 hours when occupied to purge indoor pollutants and renew oxygen.
    A 2,500 sq.ft. home needs 80-100 cfm...
  5. These are contractors or wholesalers that have...

    These are contractors or wholesalers that have handled Ultra-Aire whole house dehus that can mix fresh air with house air, filter, dry if needed, and circulate the air via the a/c ducts or...
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    Adding dehumidifiers to an a/c that is not setup...

    Adding dehumidifiers to an a/c that is not setup right, complicates fixing the a/c.
    Turn off the dehus.
    You 6need your a/c setup to remove significant moisture as the house air flows through the...
  7. We are willing to help a good contractor through...

    We are willing to help a good contractor through his first installation of a whole house ventilating dehumidifier, especially an Ultra-Aire. These are available from Therma-Stor Madison WI to...
  8. This is all about the setup of the a/c. The air...

    This is all about the setup of the a/c. The air flow through the cooling coil determines the %RH in your home. A couple Accurite temp/%RH meters from Amazon located in the home are needed to...
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    You have a large basement. What temperature and...

    You have a large basement. What temperature and %RH to want in the basement? What is the temp/%RH now?
    Same on the main floor, temp/%RH desired? Now temp/%RH?
    Fresh air ventilation? Number of...
  10. If you are saying that the basement is cool and...

    If you are saying that the basement is cool and the mainfloor feels warm, try fan "on" low speed to mix things up. 50-55%RH in a cool basement is low enough.
    Warm air rises and cold air falls. ...
  11. Get the a/c working before anything else is...

    Get the a/c working before anything else is considered. The a/c must cool the home to <75^F, 50%RH during peak cooling loads without anything else. An ERV will decrease the moisture load while...
  12. Let me research Boston area for a contractor....

    Let me research Boston area for a contractor.
    Back on Monday.
    Regards Teddy Bear
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    Enclosing the dehu in a 3/4" plywood enclosure...

    Enclosing the dehu in a 3/4" plywood enclosure isolates the sound. Also using flex duct to connect to dehu decreases vibration/noise. Bottom/top and both sides.
    Thanks again.
    Keep us posted....
  14. It is really about removing moisture from the...

    It is really about removing moisture from the air flowing through the cooling coil. The a/c needs to be functioning and the air flow slow enough to get the cooling coil 30^F colder than the return...
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    It is all about the %RH in the living space...

    It is all about the %RH in the living space during significant sensible cooling loads and high outdoor dew points.
    You contractor saw the duct work and may have recognized the need for additional...
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    Basements typically provide free cooling during...

    Basements typically provide free cooling during most of the cooling season. The biggest problem is the latent cooling load of a basement. This is usually best handled by using a premium...
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    Fan "on" low would be great. Warm basement while...

    Fan "on" low would be great. Warm basement while cooling the mainfloor, a two for one. %RH is a concern in the basement. Confirm <55%RH while circulating basement and rest of the home is fine.
    ...
  18. All things considered, I suggest a Manual J load...

    All things considered, I suggest a Manual J load calculation that would use typical inside specs for heating and cooling. This would provide a basic load spec for heating/sensible and latent capacity...
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    Where is this home located? What is the temp/%RH...

    Where is this home located? What is the temp/%RH in the basement and mainfloor?
    Temp/% at the a/c supply basement and main floor?
    Making comment without more info is not good advice to give or...
  20. An undersized heat pump in Boston is not going to...

    An undersized heat pump in Boston is not going to make happy customer during the heating season. You have to size for the heating load.
    A good setup with a 30^F split between the cooling coil...
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    HEPA filters do nothing for VOCs. Fresh air...

    HEPA filters do nothing for VOCs. Fresh air change purges them.
    A fresh air change in 4-5 hours when occupied is minimum.
    Very sensitive occupants may need a fresh air change in 3 hours.
    Keep...
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    You have moisture on the window because of a lack...

    You have moisture on the window because of a lack of fresh air ventilation.
    Also your home is damp going into the cold season. With a dehumidifier maintaining <50%RH, less moisture removal is...
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    Any problem with wrapping wood floors? Cupping is...

    Any problem with wrapping wood floors? Cupping is most common problem.
    Also check the dew point or temp/%RH of the supply air. Ideal 75^F, 50%, a 55^F dew point, needs a <50^F dew point a/c...
  24. Any well built home needs a steady flow of fresh...

    Any well built home needs a steady flow of fresh air when occupied. The idea is to purge any pollutant in the home and avoid a buildup.
    Adding a steady flow of filtered fresh air blinded with house...
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    Any chance of viewing the %RH graph???...

    Any chance of viewing the %RH graph??? Temperature is only part of the picture.
    Regards Teddy Bear
  26. Replies
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    What is the temp/%RH/^F dew point in the gym and...

    What is the temp/%RH/^F dew point in the gym and outside? There are ways of warming the supply temperature. Reheat to supply air is easiest.
    Regards Teddy Bear
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    Moisture problems on the windows is a clue...

    Moisture problems on the windows is a clue indicating a lack of fresh air infiltration. During winter, stack and wind should provide enough fresh air to remove moisture with natural air change.
    You...
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    WOW! Measuring air flow is the toughest and...

    WOW! Measuring air flow is the toughest and least understood of parts of the ideal setup.
    In the end, the cooling coil temperature verses the return air temperature is the final check. In green...
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    I am not sure about any of this. Except you...

    I am not sure about any of this.
    Except you should be able to maintain <50%RH during significant sensible cooling loads, a/c with correct air flow will be able to do this without the dehumidifier....
  30. stop running the dehu. Get the a/c to provide...

    stop running the dehu. Get the a/c to provide the temperature you want. After, you figure out the a/c, we can talk dehu. Get your a/c tech back.
    Regards Teddy Bear
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    make sure the hole that allows the wire to pass...

    make sure the hole that allows the wire to pass through the dry wall is plugged and not leaking damp air through the whole into the stat.
    Your teck can check that.
    Your air flow is on the high side...
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    Show us the %RH screen. Fan "on" is not ideal. ...

    Show us the %RH screen.
    Fan "on" is not ideal. Fan "auto" decreases re-evaporation.

    Evenings and rainy days are the proof of being able to keep the home dry (>50%RH).
    My guess is adding a...
  33. Doubling the bubble insulation is good. The...

    Doubling the bubble insulation is good.
    The exterior of the insulation being plastic avoids condensation on the cold supply. (Good)

    Temperature/%RH in the home during a hot day?
    Regards Teddy...
  34. Not the way I would do it. What is the temp/%RH...

    Not the way I would do it. What is the temp/%RH that you abe to keep the home?
    75^F, 50%RH in a home throughout the mild seasons is what you are looking for.
    The dehu supply into an active a/c...
  35. Two speed a/c is probably VS blower. You need to...

    Two speed a/c is probably VS blower. You need to slow the a/c blower to get a better reduction in moisture when the a/c cools. We looking for a <50^F dew point. A 54^F, 78%RH, a<50^F dew point...
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    Filter in dehu is enough. Regards Teddy Bear

    Filter in dehu is enough.
    Regards Teddy Bear
  37. Where is the house located? Regards Teddy Bear

    Where is the house located?
    Regards Teddy Bear
  38. If your a/c is not moving enough air, your indoor...

    If your a/c is not moving enough air, your indoor %RH will be on the low side, <47%RH. The speed of the blower, size of the ducts, restriction of the a/c filters control the air flow. Quality...
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    Of course the climate changes. Often and the...

    Of course the climate changes. Often and the climate change does not last long.
    Regards Teddy Bear
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    Typically, you may have a heating setting and a...

    Typically, you may have a heating setting and a cooling setting.
    Keep us posted.
    Regards Teddy Bear
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    Glad hear of improvement. Again on a hot day, the...

    Glad hear of improvement. Again on a hot day, the a/c should maintain 50%RH without the dehu run. Keep slowing the air flow through the a/c until enough moisture is removed during long runs.The dehu...
  42. Sounds complicated. Justin at Ultra-Aire knows...

    Sounds complicated. Justin at Ultra-Aire knows more of the t-stat complexities.
    Call him at 800 533 7533 and talk. Post on what happens. If you want full advantage of the UA, a DEH3000 is a better...
  43. Tell us about VS blow motors, some use 70 watts,...

    Tell us about VS blow motors, some use 70 watts, a light bulb. The move 100-300 cfm and are whisper quiet.
    Regards Teddy Bear
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    The a/c runs less at night because of less...

    The a/c runs less at night because of less sensible cooling load. The latent cooling load is dependent on the outdoor dew point which is steady of the 24 hours. Less sensible cooling/less...
  45. It is little dangerous to get advice on the...

    It is little dangerous to get advice on the internet.
    Regards Teddy Bear
  46. Is it possible to set a small box fan on the...

    Is it possible to set a small box fan on the inside of a window sill exhausting air out. Open other windows to allow fresh air in. A small amount of air is needed on a steady basis. 50 CFM when...
  47. The first thing you need to do is get the a/c...

    The first thing you need to do is get the a/c working correctly before add a dehumidifier. During peak cooling, what is the temperature/%RH of the a/c leaving the home and air out of the a/c. This to...
  48. This is a great post. No, a dehumidifier is not...

    This is a great post.
    No, a dehumidifier is not intended or able to help an during peak cooling loads. It removes moisture and add sensible heat. During peak cooling loads, turn off the...
  49. You go for it, we can straighten any out with a...

    You go for it, we can straighten any out with a good tech.
    Setting a 70 pint in the basement over a drain is one thing.
    Connecting is something else. Most whole dehus are connected to lazy a/cs...
  50. Your a/c coil is loaded with moisture. You are...

    Your a/c coil is loaded with moisture. You are moving air through the wetted a/c coil. The air will be damp until the coil is dried by the air flowing through it. Get it?
    Regards Teddy Bear
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