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    So interesting. Homes leak air during high winds...

    So interesting. Homes leak air during high winds like +10 mph. Most get an air change in 4-5 hours during high winds. Yet, during calm winds and moderate temps, the air change rate drops to an air...
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    Close the supplies in the unused/cold spaces. ...

    Close the supplies in the unused/cold spaces. You are dependent on the undercut of the door or leaving the door open to get warm air back to the a/c. Feel the velocity of the air passing under the...
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    Slowing the fan will raise the indoor temp and...

    Slowing the fan will raise the indoor temp and lower the %RH. 78^F,52%RH is good. Perfect may be 76^F, 50%RH for some. This easy with high outdoor temps. The fun starts with cool wet days and...
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    Yes, you need supplemental dehumidification, but...

    Yes, you need supplemental dehumidification, but you should setup the a/c to remove a significant portion of the moisture during high cooling loads. With a dehumidifier in the basement, set the dehu...
  5. You need a skilled tech. The hot gas from a...

    You need a skilled tech. The hot gas from a properly charged heat pump compressor is +180^F into the desuperheater. It comes out much cooler and goes on to the outside condenser. Turn off the water...
  6. Any fresh air ventilation to comply FL's new code...

    Any fresh air ventilation to comply FL's new code concerning ventilation?
    The good FL homes are air tight enough that they do not get a fresh air in less than a day during calm winds. ASHRAE ...
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    Curious, if you are building a high quality home,...

    Curious, if you are building a high quality home, any thoughts about doing indoor air quality fresh air ventilation humidity control for the lower levels of the home during low/no cooling loads? All...
  8. Try running in the fan "on" low over night. We...

    Try running in the fan "on" low over night. We had a In Gr speed that had a cold lower level that was much colder than the upper level. Although not perfect, much better.
    The heat pump overcools...
  9. Keep the humidity

    Keep the humidity <50%RH, good. Look for a wet spot or check for moldy spots like under carpeting or behind wall covering. Check you %RH meter against some known condition.
    Mold also can grow in...
  10. Not to worry. It is complicated. Air tight...

    Not to worry. It is complicated. Air tight homes with many occupants can be high humidity from the occupants during low/no cooling loads because of the moisture from the occupants. Homes that get...
  11. Most important is the cooling coil temperature....

    Most important is the cooling coil temperature. You need a <50^F coil temperature to get a 55^F dew point which is 75^F, 50%RH. This is possible with any type of metering device. You need a good...
  12. Homes need a fresh air change in 4-5 hours. ...

    Homes need a fresh air change in 4-5 hours. During calm winds and moderate temps, most home do not get enough fresh air and require mechanical fresh air. When the outdoor dew points are +55-70^F,...
  13. I would include a heavy duty high effiecency dehu...

    I would include a heavy duty high effiecency dehu like a Santa Fe Compact in the basement space to keep the space from getting musty. It keep the entire home dry is the door is open to the rest of...
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    The idea is to have a fresh air change in 4-5...

    The idea is to have a fresh air change in 4-5 hours when the home is occupied. You must estimate the amount of fresh air you are getting, figure the total volume of the home including basement, and...
  15. I forgot to add that the dehu will not replace...

    I forgot to add that the dehu will not replace the a/c for those hot days. Also when the home is closed, operating the fan on the a/c will circulate the dry basement air throughout the home. This is...
  16. If you have a wet spot to dry, get a commercial...

    If you have a wet spot to dry, get a commercial low grain drier like the large Phoenix Max dry dehumidifier and a couple drying fans. Turn up the heat, remove the standing water like someone...
  17. It is about maintaining a low %RH in the space. ...

    It is about maintaining a low %RH in the space. Cool walls and basement floor usually keep the space <70^F. I suggest measuring the temp/%RH in the basement and the outside temp/%RH. We can...
  18. Why not measure your temp/%RH with a $20 %RH...

    Why not measure your temp/%RH with a $20 %RH meter? Try both ways and report the difference. I run my fan on low 24/7 but it does evaporate some of the moisture back into the home. My 2 ton a/c...
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    Low speed is fine. Regards TB

    Low speed is fine.
    Regards TB
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    How much air is being exhaust when the fan...

    How much air is being exhaust when the fan operates? 100 cfm of fresh air is not enough to keep you a/c running. Now with the fan off, how much fresh air ventilation do you get? While the a/c...
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    I hope it makes sense to you that you need fresh...

    I hope it makes sense to you that you need fresh air in your home to purge indoor pollutants and renew oxygen. Most codes suggest a fresh air change in 4-5 hours when the home is occupied. The...
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    At some point try operating the blower on the a/c...

    At some point try operating the blower on the a/c in the on mode. This will circulate the dry throughout the entire home. You will be surprised at the results. Do it when the a/c is in a partial...
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    The amount of heat depends on the amount of water...

    The amount of heat depends on the amount of water removed and electricity used. 1,050 btus for each pint/lb. of moisture removed plus 3414 btus per kwh. each degree of temp rise in the space lowers...
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    Sorry I missed the "two" 10" ducts. By using two...

    Sorry I missed the "two" 10" ducts. By using two ducts, you have more duct than the minimum of one 10" duct. The total grill area of 78 sqin is ok for both supplies. For the return from upstairs...
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    Match the cross section of the duct, +75 in^2....

    Match the cross section of the duct, +75 in^2.
    Keep us posted.
    Regards TB
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