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  1. Chilled water has limitations at removing...

    Chilled water has limitations at removing moisture because every btu removed from the air raises the chilled water 1^F. You end up with water above the desired dew point of the air quickly.
    With...
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    Tell us about the supply temp/%RH from the a/c...

    Tell us about the supply temp/%RH from the a/c and same on the return air. The mins. of run/off cycle during peak run times.
    During the hottest days, a properly setup a/c should remove 3 lbs. of...
  3. Going without an heat pump? If you do not get a...

    Going without an heat pump? If you do not get a payback, why complicate the cooling system?

    Dehumidifier connected to the a/c ducts is best to distribute the dry air throughout the home. If you...
  4. Our posts are full of setup, service problems...

    Our posts are full of setup, service problems with complex systems. Keep it simple with mid SEER ratings.
    When I read a post like yours, I realize how vulnerable end users are to making a mistake...
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    The pleated cloth with higher merv ratings are...

    The pleated cloth with higher merv ratings are more restrictive which will slow air flow.
    Tech should be able to set the air flow to get a 45^F coil temp with a 75^F, 50%RH return temperature....
  6. A foam home with fresh air ventilation or not? ...

    A foam home with fresh air ventilation or not? What is the %RH and outside temp/%RH or dew point?
    Regards Teddy Bear
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    Run in the comfort mode. Forget about EFF. Leave...

    Run in the comfort mode. Forget about EFF. Leave the windows closed, this loads your home with moisture when the outdoor dew points are +55^F. These are complex systems. Also set up humidity...
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    Every off cycle is an additional 2-3 lbs. of...

    Every off cycle is an additional 2-3 lbs. of moisture that re-evaporates back to the space in the home. Keep in mind the attic is hot and heats the air handler which speeds up the re-evaporation of...
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    Consider that the drywall ceiling is near or...

    Consider that the drywall ceiling is near or below the dew point of the air in the attic. The %RH on the attic side of the drywall is near 100%RH because the moisture from outside migrates through...
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    Where is the air handler located? What is above...

    Where is the air handler located? What is above the 3rd floor?
    Fan "on" or "auto"? Nights verses days?
    Regards Teddy Bear
  11. Wow! go to the North woods for a couple days and...

    Wow! go to the North woods for a couple days and all hell brakes loss.
    Back in the last energy crisis, earthhomes were rage. We were doing many with ventilating dehumidifiers and inslab heat. They...
  12. We are taking a couple of ounces of water...

    We are taking a couple of ounces of water evaporation per cycle. It is nothing compare to the 3-4 lbs. per hour of moisture load from the occupants and infiltration/ventilation fresh air when the...
  13. Good to hear that fresh air ventilation is part...

    Good to hear that fresh air ventilation is part of your program and that you are using an Ultra-Aire 70H to do it.

    Most on this site struggle to maintain low %RH without fresh air.
    Nothing...
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    I did not read anything about fresh air...

    I did not read anything about fresh air ventilation in your new home. Also Fl codes are concerned about supplemental dehumidification for the times of the year that there is low/no cooling loads and...
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    I must say, I got all choked up reading this...

    I must say, I got all choked up reading this post.
    Thanks for the feed back, you made my day.
    Regards Teddy Bear
  16. Shame on me for missing this great post. Better...

    Shame on me for missing this great post. Better late than never, I hope.
    Returning the air form an isolated area and supplying the dry air to the a/c supply allows operation of the dehumidifier...
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    50-55%RH great for a cool basement. Regards...

    50-55%RH great for a cool basement.
    Regards Teddy Bear
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    50%RH in a basement very good. Occasional 55%RH...

    50%RH in a basement very good. Occasional 55%RH in cool basement is ok.
    Looks like you got a handle on the problem, Congratulation!
    Ok maybe not perfect. I was hoping for an Ultra-Aire. But do...
  19. I would include a supply duct with a balancing...

    I would include a supply duct with a balancing damper in the duct. The opening for the cat will work for the return air. Either unit will work.
    Keep us posted.
    Regards Teddy Bear
  20. The are big differences between dehumidifiers. ...

    The are big differences between dehumidifiers. Efficiency, durability, and cost are wide. For ocassional use in an open area, a good sized portable will work.
    For a work horse that you are going...
  21. After +1 hour cooling run expect 50%RH. During...

    After +1 hour cooling run expect 50%RH. During low/no cooling loads, the indoor %RH is dependent on the outdoor dew point and the number of occupants in the home.
    With a +60^F outdoor dew point and...
  22. Yes you can add a dehumidifier later. In cape...

    Yes you can add a dehumidifier later.
    In cape coral, I needed heat two evenings last year. I would use electric heat and avoid the heat pump in your area.

    Keep us posted.
    Regards Teddy Bear
  23. The UA 98H removes 3-4 lbs. of moisture per...

    The UA 98H removes 3-4 lbs. of moisture per hour. This should handle about a 100 cfm of fresh air infiltration/ventilation and the moisture from the occupants.
    Circulation of the dry air...
  24. The outdoor dew points are +65^F while the...

    The outdoor dew points are +65^F while the outdoor temps are <75^F, how does the a/c run enough to maintain 50%RH inside the home? Infiltration/ventilation and the moisture from the occupants is 3-5...
  25. Any surface that is below dew point of the air...

    Any surface that is below dew point of the air will sweat. Covering the cold surface with moisture air passing material like fiberglass or moisture absorbent material will be come damp or wet. ...
  26. Operate your air handlers blowers on "low" on...

    Operate your air handlers blowers on "low" on during the noncooling cycle. There is no heat in the basement to go up. All the walls and floor are cold verses warm in the rest of the home. Most...
  27. The key is the amount of air flow verses the...

    The key is the amount of air flow verses the cooling capacity. I am not familiar with your system. Followup with air temps/%RH with both stages and contact your a/c tech.
    You need a 45^F coil temp...
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    A electrical contractor or a HVAC contractor can...

    A electrical contractor or a HVAC contractor can purchase these units direct from the factory, HVAC wholesaler, or from the internet.
    Appreciate the support.
    Regards Teddy Bear
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    VS Blowers are good and ease air flow adjustment....

    VS Blowers are good and ease air flow adjustment. A old system like yours is best replaced in total. Suggest a small whole house dehumidifier as part of any update make real humidity control a sure...
  30. You are living our dream. The perfect sized a/c...

    You are living our dream. The perfect sized a/c that runs a lot yet holds temp. A/c handles long runs better than short cycling.
    Get a good %RH meter like an Accurite from Amazon. Tells what the...
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    The Ultra-Aire 70H does not need an air handler. ...

    The Ultra-Aire 70H does not need an air handler. It has enough fan power to circulate air throughout. I suggest a small duct system to circulate dry fresh air throughout the home when needed. The...
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    You will need a small whole house dehumidifier...

    You will need a small whole house dehumidifier with or without the HRV. This is because of the moisture in the outside air during the 3 damp seasons of the year. The exhaust devices in your home...
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    Focus on the dew points of the air outside, at...

    Focus on the dew points of the air outside, at the return, and the supply, not the %RH. Cooling air raises the %RH. On a hot day the outdoor %RH is low while the dew point is high when the air is...
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    Sorry I got to the party late. Fan "on" or...

    Sorry I got to the party late.
    Fan "on" or "auto? Any chance for temp/%RH from separate %RH meter? The Accurite meters are ok. Does your condensate drain go outdoors or into a drain? After you get a...
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    Where in God's green earth is this going to be...

    Where in God's green earth is this going to be located? Air tight? Basement? Fresh air ventilation?
    Keep us posted? All of us have struggled with big sweaty ducts commercially. There is a fix....
  36. How much air can you suck through a 1" pipe? If...

    How much air can you suck through a 1" pipe?
    If it makes you fee better, put a trap in. My biggest fear is that the pan may over flow because air backflow stops condensate from draining.
    Even a...
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    All good points. Yes, what the world needs is...

    All good points. Yes, what the world needs is more experienced techs. My point is that one of the biggest problems in not enough sensible cooling load to keep the space dry during low/no sensible...
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    All of the cooling coils that I have measured,...

    All of the cooling coils that I have measured, remove both sensible and latent heat together when the coil temperature is below the dew point of the air being cooled. The ratio is dependent on the...
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    Yes, adding a dehumidifier will lower the indoor...

    Yes, adding a dehumidifier will lower the indoor %RH during low/no cooling loads. Might need 4-6 lbs. per hour of dehumidification.

    During high cooling loads, adding a dehumidifier may not effect...
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    Most are comfortable in a specific combination of...

    Most are comfortable in a specific combination of temperature, %RH, and air velocity.
    82^F, 55 %RH, 5 mph air movement or 500 fpm is delightful. The air velocity increases evaporative cooling.
    As...
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    The main cause of high indoor humidity is high...

    The main cause of high indoor humidity is high outdoor dew points and the moisture from the occupants.
    Most like 75^F, 50%RH which is a 55^F dew point. A typical family adds 1-2 lbs. of moisture per...
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    These are great questions. Lets see if I can...

    These are great questions. Lets see if I can give answer that makes sense. This will be a challenge for both of us. Some did this for many years ago.
    My statement is that the a/c is unable to...
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    I should add with a dehumidifier in the home, you...

    I should add with a dehumidifier in the home, you can turn off the a/c when the home is unoccupied and keep the home <50%RH without operating the a/c. This saves big bucks in electrical cost and...
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    Certainly yes, centrally a 70 pint dehumidifier...

    Certainly yes, centrally a 70 pint dehumidifier will help and much better than living with what you have.

    But, here is better approach. Get that "lazy a/c" working the way it should. During peak...
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    The preferred method of dehumidification would be...

    The preferred method of dehumidification would be to locate the dehumidifier next to the a/c and route the dry air from the dehumidifier to the ducts down stream of the a/c cooling coil. This gets...
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    Yes, during the peak of the day when (if) heat...

    Yes, during the peak of the day when (if) heat gain exceededs the a/c's capacity, expect the temp/%RH to rise. There is a undersizing craze in the industry because a/cs are unable to maintain low %RH...
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    All dry cooling coils remove more moisture during...

    All dry cooling coils remove more moisture during the first 10-20 mins. until they load enough moisture to start draining. Then they remove at a steady rate. A 70 pint per day dehu may remove 2 lbs....
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    Slowing air flow slows the cooling rate which...

    Slowing air flow slows the cooling rate which extends run time at a lower electrical consumption while increasing the lbs. per hour of dehumidification. More insulation on your attic ducts makes...
  49. I should add that if you could get a couple hours...

    I should add that if you could get a couple hours of operation, the indoor %RH would be <50%RH.
    Adding a dehumidifier with a/c that has a 45^F cooling coil will result in good humidity control in...
  50. What was the temperature/%RH in the middle of the...

    What was the temperature/%RH in the middle of the home? 75%^F, 50%RH in the space with 46^F cooling coil would be good.
    Keep us posted.
    Regards Teddy Bear
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