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  1. An example of TX outdoor %RH verses dew point. ...

    An example of TX outdoor %RH verses dew point.

    614521

    The amount of moisture in the air about the same throughout the 24 hours.

    Regards Teddy Bear
  2. Forget about the %RH for a minute. The dew point...

    Forget about the %RH for a minute. The dew point on hot TX day is about 70^F throughout the 24 hours. The outdoor %RH is 50%RH at the peak temperature of 90^F and 100%RH at 70^F in late hours. This...
  3. I am suggesting setting up the cooling to provide...

    I am suggesting setting up the cooling to provide a <50^F dew point supply air to the home. During long cooling runs, you will have 50%RH. During low/no cooling loads, you will need a small whole...
  4. Fan "on" will make the %RH higher because of the...

    Fan "on" will make the %RH higher because of the evaporation of the moisture on the coil at the end of cycle. Fan "auto" should help.
    During low/no cooling loads and high outdoor dew points expect...
  5. How and why over sized a/c with a dehumidifier...

    How and why over sized a/c with a dehumidifier will do the job.
    Single issues are much easier to understand and deal with. We are dealing with making a home cool to make the occupants comfortable. ...
  6. A tech visits and get rid of condensation by...

    A tech visits and get rid of condensation by increasing the air flow. This will stop mold from growing on ducts and other wet spots.
    Your humidity rises. Your small dehumidifier lowers the...
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    You should include one whole house dehumidifier...

    You should include one whole house dehumidifier for great humidity control during cool wet weather. A/c is unable to control humidity during low/no cooling loads and high outdoor dew points.
    Keep...
  8. Replies
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    What part of the country is this in? Regards...

    What part of the country is this in?
    Regards Teddy Bear
  9. Great postings, really understanding how to...

    Great postings, really understanding how to set-up an a/c to provide comfort, health, and durable function.
    Most a/c are installed and started with critical setup. One of the most common posts on...
  10. Most agree about air filtering and

    Most agree about air filtering and <50%RH, most suggest the most critical issue is a fresh air change in 4-5 hours when the home is occupied. The role is to purge indoor pollutants and renew oxygen...
  11. Most a/cs can be setup to remove large amounts of...

    Most a/cs can be setup to remove large amounts of moisture provided they get to operate for extended periods of time. Keep in mind that none of the a/cs are able to maintain low indoor %RH during...
  12. Make sure that the crawl is sealed with the vents...

    Make sure that the crawl is sealed with the vents closed. Stoves with outside air respond to pressure inside the home. A small amount of positive pressure avoids puffs of leakage when loading wood....
  13. For a wood stove, I like the idea of simple...

    For a wood stove, I like the idea of simple make-up air ventilation in air tight construction. It helps the stove get the smoke out of the home. With a wood stove supplying heat, the cost of...
  14. Using these numbers from a cool day and at lower...

    Using these numbers from a cool day and at lower indoor temps does not give the info needed.
    We need the temps/%RH of the return air and supply air during actual normal load conditions.
    On a hot...
  15. Replies
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    377

    If you gave an a/c guy a plastic bag to crawl...

    If you gave an a/c guy a plastic bag to crawl into, he would. After all no leakage is good their mind.
    A fresh air change in 4-5 hours is recommended to purge indoor pollutants and renew oxygen. ...
  16. Nothing about basic setup? The indoor %RH is...

    Nothing about basic setup? The indoor %RH is about how much air flow through the cooling coil. Measure the return air temp/%RH and the supply air temp/%RH. If an a/c operates for several hours on...
  17. Replies
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    377

    No breathing? .25-.5 lbs/hour. You need some...

    No breathing? .25-.5 lbs/hour.
    You need some infiltration or you have poor indoor quality. You need an air change in 4-5 hours. 50-60 cfm fresh air
    Get a small dehumidifier set at 50%RH. The a/c...
  18. Replies
    11
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    377

    The moisture is from occupants breathing and a...

    The moisture is from occupants breathing and a small amount of fresh air infiltration.
    A minimum of an air change of fresh air in 4-5 hours is needed to purge indoor pollutants and renew oxygen....
  19. If I lived in Texas and had a 15 year old a/c...

    If I lived in Texas and had a 15 year old a/c that worked well for many early years, without noticeable comfort problems, I get the same size.
    Texas is not a place that you want an undersized a/c....
  20. Replies
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    1,988

    I forgot to ask, where is this located? what are...

    I forgot to ask, where is this located? what are the outside dew points?
    Regards TB
  21. Hope you get a Carrier expert to explain the...

    Hope you get a Carrier expert to explain the concept. I have Carrier a/c with humidity control. My brother has Carrier Green Speed with all the bells and whistles. Both will overcool and slow the...
  22. Replies
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    1,988

    This is a classic example of the effect of low...

    This is a classic example of the effect of low air flow on the amount of moisture removed. Some people would kill for a 40% RH on the return. It is a little low but be careful not get too much air...
  23. Replies
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    443

    You are absolutely right. The Question is do you...

    You are absolutely right. The Question is do you care to improve your indoor air quality? One or two out of ten do. Keep trying.
    Regards Teddy Bear
  24. Replies
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    443

    Next level is fresh air ventilation when...

    Next level is fresh air ventilation when occupied. Most suggest a fresh air change in 4-5 hours. This purges indoor pollutants and renews oxygen.
    Kick it up another notch, maintain <50%RH during...
  25. Well, I have finally confused everyone with too...

    Well, I have finally confused everyone with too much detail.
    My point was that you added a 70 pint dehumidifier and only lowered the %RH a couple %RH. Yet you are removing much water with the...
  26. Good whole house dehumidifiers have enough fan...

    Good whole house dehumidifiers have enough fan power to blow dry into the supply duct while the a/c is operating. During high cooling loads, a properly setup a/c should maintain the desired %RH like...
  27. Replies
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    270

    Get a small Temp/%RH meter and place it in the...

    Get a small Temp/%RH meter and place it in the center of the home. Report the readings as you move in and settle. Do you have fresh air ventilation? Square feet? Number of occupants? The a/c will...
  28. Your remaining question should be asked of the...

    Your remaining question should be asked of the installer. Be gentle.
    Keep us posted.
  29. Replies
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    1,201

    I am not knowledgeable on your specific system. ...

    I am not knowledgeable on your specific system. Two speed and zoning?
    I sounded like you had a lower blow speed yet? If so, I go to it. You are making progress. <45^F coil will lower the %RH more...
  30. Replies
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    5,809

    The numbers I use are for the amount of fresh air...

    The numbers I use are for the amount of fresh air per occupant at specific CO2 levels are:
    CO2 PPM CFM of 450ppm fresh air
    650 53 cfm
    800 30 cfm
    1,000 19 cfm...
  31. Replies
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    1,988

    Could be normal. During the a/c cycle you need a...

    Could be normal. During the a/c cycle you need a coil temp that is 30^F lower than the return air temp to get good moisture removal. Measure the return temp/%RH and supply temp/%RH.
    Keep us posted....
  32. Closely sizing the dehu is also best to minimize...

    Closely sizing the dehu is also best to minimize cycling. During low load conditions, you have cycling just like the a/c. Have enough capacity to handle the extremes is important also. I also...
  33. Replies
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    5,809

    Did a review on all the posts, This a real case...

    Did a review on all the posts, This a real case study. The following is what I would do if I was you.
    I would suggest restricting the air flow at the air filter to the point that the dew point...
  34. Replies
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    1,575

    If you are asking me this question, here is my...

    If you are asking me this question, here is my answer.
    Any type of multispeed a/c remove more moisture than a single speed but are expensive and complex. They unable to maintain <50%RH during...
  35. The key to insulating ducts to reduce...

    The key to insulating ducts to reduce condensation is to use an insulation that have an exterior vapor barrier and sealing the edges to stop damp air from infiltrating the insulation. It will help. ...
  36. Do not close the vents before you cover the...

    Do not close the vents before you cover the earth/sand. There is a large amount of moisture that evaporates from the sand into the air. That is why the sand is dry. Youu must cover the earth with...
  37. Well stated! Being a dehumidifier guy, I suggest...

    Well stated! Being a dehumidifier guy, I suggest closing the vents, covering the sand with plastic, and keep the space dry with the best dehumidifier you can afford. This will have marked impact on...
  38. You got to love a BaldLoonie! Bold & Bald yes,...

    You got to love a BaldLoonie! Bold & Bald yes, but not loonie.
    Best to get plastic on the exposed earth to the foundation walls, close the vents, and install the best dehumidifier you can afford....
  39. Replies
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    1,575

    A VS blower makes adjusting the air flow in the...

    A VS blower makes adjusting the air flow in the cooling mode easy to get ideal moisture removal while cooling. Also during most none cooling conditions, "low" fan mode keeps the temps throughout out...
  40. Replies
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    1,201

    Like the man says, higher air flow = higher...

    Like the man says, higher air flow = higher indoor %RH. Drop 2 notches on air flow.
    Keep us posted.
    Regards Teddy Bear
  41. Replies
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    This a typical series of temps/%RH, The return...

    This a typical series of temps/%RH,
    The return air or condition of air in the home,75^F, 50%RH, 55^F dew point is good.
    The supply air or air out of the grill to the home 50^F, 85%, 47^F dew...
  42. Replies
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    Unless your outside air unusally bad, a large...

    Unless your outside air unusally bad, a large filter bed of charcoal should last longer like 2-3 months. Also in green grass climates, a whole house dehumidifier could ideal to provide the base of...
  43. Thread: HVAC woes

    by teddy bear
    Replies
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    591

    Correct refrigerant charge and %RH in the space...

    Correct refrigerant charge and %RH in the space are the major issues. As dan says, you need <50%RH during one hour plus cooling runs. Air Leaks, amount of refrigerant, and blow speed are issues...
  44. Replies
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    Multi-staging heating and cooling changes the...

    Multi-staging heating and cooling changes the distribution of conditioned air throughout the home in high low stages. I find the heat goes more to the high supplies and the cold goes to the low...
  45. What %RH do you get in the standard mode. In...

    What %RH do you get in the standard mode. In most green grass climates, you need the dehumidification mode during low/no cooling loads and high outdoor dew points. In fact, the 70% blower reduction...
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    Yes over-sized for sure, but as long as you are...

    Yes over-sized for sure, but as long as you are comfortable with the temp/%RH, the only benefit is less short cycling. Your energy cost will not be much lower. I can understand why the contractor...
  47. After the coil is replaced, you need the correct...

    After the coil is replaced, you need the correct charge of refrigerant and the correct blower speed get a cooling coil temperature about 30^F below the return air temperature. A good tech can do...
  48. Providing 48-52%RH is not bad. Your comment on...

    Providing 48-52%RH is not bad. Your comment on your old unit was that ran all the time, well this one cycles with 90^F. Sounds like a little extra capacity for the hottest weather and company.
    What...
  49. Replies
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    Do not feel bad. It is all about the high outdoor...

    Do not feel bad. It is all about the high outdoor dew points. Warm up your garage or dry the air in your garage. A cool floor and a cool common house wall are cooling the air in your garage and...
  50. That is good. Thanks for the support. I do the...

    That is good. Thanks for the support. I do the same on some basements, depending on the customers needs. !0,000 btus per hour from a dehumidifier in a basement is a good deal. It warms the...
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