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  1. Depending on the size of the crawlspace. If less...

    Depending on the size of the crawlspace. If less than 1500 sq.ft., a supply from the main whole house may handle the space. A separate dehumidifier makes it simpler. Where are a/c air handlers...
  2. My experience is the that the stuffy air and high...

    My experience is the that the stuffy air and high %RH is a 3 mild seasons of the problem. With cold outside air and winter wind, most home get enough fresh air. If anything they have so much dry...
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    Slowing the fan speed slow cooling rate improves...

    Slowing the fan speed slow cooling rate improves moisture removal. Setup which includes fan speed adjustment to get ideal moisture removal is basic.
    Some installers do not have a clue.
    In the end...
  4. At the end of the cooling cycle, the cooling coil...

    At the end of the cooling cycle, the cooling coil is loaded with moisture. If heat is called for within 1 hour, expect any moisture left on the cooling coil to rapidly to evaporate and pass on the...
  5. Just to make sure that you understand a bubble...

    Just to make sure that you understand a bubble plastic pool insulation that will float on top of the water in the crawlspace will contain the moisture under the plastic that will grow mold and will...
  6. Good question. Each lb. of moisture removed is...

    Good question.
    Each lb. of moisture removed is 1,050 btus of condensing energy. Plust the electricity converted to heat, 580 watts X 3.4 btus = 5,129 btus per hour, +-.
    Close enough?
    Keep in mind...
  7. Yes, the heat from the moisture removal process...

    Yes, the heat from the moisture removal process is added to the home. First off, a well setup a/c should be able to maintain <50%RH during peak cooling loads. If not, the a/c air flow can be adjusted...
  8. A crawlspace that floods is the toughest problem....

    A crawlspace that floods is the toughest problem. I suggest a bubble pack plastic like on a pool. The plastic would float on top of the water. Fasten the plastic to the wall with a strip of plastic....
  9. [QUOTE=PBJ918;25806392]I am located in Tulsa, OK....

    [QUOTE=PBJ918;25806392]I am located in Tulsa, OK. I have an 1100 sqft 1920 craftsman house that I totally gutted in 2012 and made into a very tight, efficient house. All exterior walls, roof deck and...
  10. There is a lot of "Just live with it going on"....

    There is a lot of "Just live with it going on".
    Fresh air is most benefical during the three mild seasons of the year. No wind or stack effect to make fresh air pass through the home removing...
  11. Which house first? Is the larger new home spray...

    Which house first?
    Is the larger new home spray foam also?
    Most experts suggest a filtered fresh air change in 3-5 hours when the home is occupied. Homes have exhaust devices like a clothes...
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    No need for UV unless your fresh air has a...

    No need for UV unless your fresh air has a pollutant that needs to be controlled by UV.
    With adequate fresh air change to purge indoor pollutants and renew oxygen, filtering spores/pollen/dust is...
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    Top indoor air quality in a home starts with a...

    Top indoor air quality in a home starts with a fresh air change in 4-5 hours to purge indoor pollutants and renew oxygen at a minimum when occupied. When the outdoor dew point is 50-55^F and the...
  14. Typically a 6" fresh air duct is routed from...

    Typically a 6" fresh air duct is routed from outside to the inlet of the dehumidifier and joined with a return duct from the open part of the home. A 2,500 sq.ft. home needs about 80-100 cfm of...
  15. Good question. Maybe the difference in running...

    Good question. Maybe the difference in running hours and dehu coils may be colder. A/cs have plenty of failures also.
    We will keep on trying to improve.
    Large coils have thicker copper tubing?...
  16. Sorry about missing your original post. Keep us...

    Sorry about missing your original post.
    Keep us posted on any additional question and how the solution works out.
    Regards Teddy Bear
  17. 20 years ago we had

    20 years ago we had <2% failure rate without any special treating or coatings.
    We are currently struggling to get that low with the best of coatings and details. The failure rate has declined...
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    Fresh air should not be limited to equipment...

    Fresh air should not be limited to equipment operation. Fresh air is needed when the home is occupied to purge indoor pollutants and renew oxygen. Needed for the health of the occupants!

    An air...
  19. Thread: Make up air

    by teddy bear
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    205

    Monster hoods are 650 cfm when measured. Regular...

    Monster hoods are 650 cfm when measured. Regular hood more like 100 cfm on high. Ratings are higher but seldom deliver more than 50%.
    Seldom do homes need more than 200 cfm of exhaust. There are...
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    Lets get back to the problem. Mold inside the...

    Lets get back to the problem. Mold inside the ducts or on the outside? My concern is that you do get mold in the new ducts like the old ones. What climate is this home located in? Cold climate...
  21. Probably a freeze-up of coil as the unit died. Or...

    Probably a freeze-up of coil as the unit died. Or could have been an strong dip in outdoor dew point?
    Regards Teddy Bear
  22. Looken good! Keep us posted. Regards Teddy Bear

    Looken good!
    Keep us posted.
    Regards Teddy Bear
  23. All have had fun with cooling coil refrigerant...

    All have had fun with cooling coil refrigerant leaks. All Therma-Stor coils are epoxy coated and baked. This has dramatically reduced the leaks, but still have occasional leak. Probably chemicals...
  24. Sorry, I missed that. Dew point is different...

    Sorry, I missed that. Dew point is different than temp/%RH. What is the temp/%RH on a/c supply? I will figure the dew point.
    Another point, Fan mode should be "auto" mode. No fan during off...
  25. The Quest dehumidifiers are high efficiency...

    The Quest dehumidifiers are high efficiency dehumidifier made in the USA. They remove 6-9 lbs. per KWH plus provide significant free reheat like 12,000 buts per KWH while removing the moisture. ...
  26. Musst be a winter climate? Fresh air change is a...

    Musst be a winter climate?
    Fresh air change is a must, a fresh air change in 4-5 hours minimal when occupied to purge indoor pollutants and renew oxygen. A valid point on using mechanical fresh air...
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    Are you saying that because your home is cold, it...

    Are you saying that because your home is cold, it is over-ventilated? The ideal fresh air change rate when a home is occupied is ranges from a fresh air change is 3-5 hours to purge indoor...
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    Any organized fresh air ventilation? Most suggest...

    Any organized fresh air ventilation? Most suggest a fresh air change in 4-5 hours when the home is occupied with normal materials in the home. Without fresh air change, the home will vary with VOC...
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    Most home have excess summer moisture retained in...

    Most home have excess summer moisture retained in their homes. Start by operating an exhaust fan when the moisture shows on the cold glass. It takes a couple weeks of 24/7 exhaust ventilation to...
  30. Start first by checking the temp/%RH on the...

    Start first by checking the temp/%RH on the return or room air and the supply air to the space. If want a 75^F, <45%RH, a 52^F dew point, the a/c supply must have moisture removal that is equal to...
  31. Go simple a/c and add a small whole house...

    Go simple a/c and add a small whole house dehumidifier with the fresh air option. I assume you live in a green grass climate and are building a quality, air tight home. During calm weather and...
  32. Install is important. If you want 60-70cfm of...

    Install is important. If you want 60-70cfm of fresh air, a 6" insulated duct from the fresh air inlet grill with a screen to the dehumidifier. The small whole house units have an 8" duct inlet. A...
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    SCrapes from construction is the same material...

    SCrapes from construction is the same material the home is made up. I am not in favor of dirty ducts but maintaining a fresh air change is critical to maintain a healthy home purged of common...
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    VS a/c is slightly better that conventional a/c...

    VS a/c is slightly better that conventional a/c or heat pumps. But the most sophisticated VS a/c are unable to maintain <50%RH with a +40% sensible cooling load. During rain and evenings a small...
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    You are confusing circulation and ventilation. ...

    You are confusing circulation and ventilation. If you air handler blowers are VS, set "on" low speed 100% of the time for both.
    Needing to change filters more often is good, cleaner air and less...
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    I would include a small whole house dehumidifier,...

    I would include a small whole house dehumidifier, like an Ultra-Aire 70H, in the a/c ducting to avoid moisture problems in the earth ducts. Heat loss/gain is not the problem. Keeping them +50%RH is...
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    Avoid in ground ducts because of mold growth...

    Avoid in ground ducts because of mold growth because the duct surface cool. Best kept in conditioned space.
    Keep us posted.
    Regards Teddy Bear
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    All a/cs dehumidify. The higher SEERs have...

    All a/cs dehumidify. The higher SEERs have larger cooling coils for better sensible cooling efficiency. Unfortunately, The coils being larger, require more moisture to load them and start dripping...
  39. The Santa Fe may be more dehumidifier than you...

    The Santa Fe may be more dehumidifier than you need. Tell us about what you are trying to do and in what part of God's Green Earth you are in>
    Regards Teddy Bear
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    Glad to hear you still kicking. Lower SEER will...

    Glad to hear you still kicking. Lower SEER will do more dehumidification and be easier to setup. Sizing, consider over-sized a/c requires more supplemental dehumidification. Manual J sizing is mid...
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    Are "VOCs" high when the home is unoccupied?...

    Are "VOCs" high when the home is unoccupied?
    Some of the new monitors are "broad specterm" may include CO2.
    A properly ventilation home should be <1,500 with <4 occupants.
    What type of fresh air...
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    How about start with temperature and %RH in space...

    How about start with temperature and %RH in space in the air coming from your a/c? All you have told us it that you have a serious mold problem and have had the a/c company out and slowed the a/c...
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    Your home is air tight enough to require...

    Your home is air tight enough to require mechanical fresh air ventilation to purge indoor pollutants and renewal of oxygen. Also all of your exhaust devices like the kitchen hood, bath fans, and...
  44. Bath fans, kitchen hood, clothes drier all...

    Bath fans, kitchen hood, clothes drier all exhaust air creating a negative pressure sucking in air from neighbors/outside air. Your 3 ton a/c should remove 10 lbs. of moisture per hour. Your...
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    I hope it includes the zero energy water heating...

    I hope it includes the zero energy water heating system, Therma-Stor Reclaim tanks?
    They will provide 1,000 gals. of free hot water per day from a couple large freezers. The other part is that are...
  46. The fact that the grills sweat is a sign that the...

    The fact that the grills sweat is a sign that the system is trying to remove more moisture.
    Hope that you are operating the a/c blower in the "auto" mode. This means the a/c blower only operates...
  47. Closed cell foam is much better at controlling...

    Closed cell foam is much better at controlling temp and moisture.
    Well insulated equipment and ducts will do the job. An insulated closet in the attic is nice but as you see more money.
    Some a...
  48. Closed cell foam is much better at controlling...

    Closed cell foam is much better at controlling temp and moisture.
    Well insulated equipment and ducts will do the job. An insulated closet in the attic is nice but as you see more money.
    Some a...
  49. My bet is that your old system had a small...

    My bet is that your old system had a small cooling coil and blower. The effect is that is less efficient and removes more moisture and less sensible cooling.
    You knew is much more efficient but...
  50. Condensation on a cold surface, check the...

    Condensation on a cold surface, check the temp/%RH? dew point of the air on the wet side. If living space needs to be <50%RH most of the time. If not better dehumidification is required. Adjust...
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