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  1. Keeping the dew point in the space well below the...

    Keeping the dew point in the space well below the concrete floor temperature is important to avoid mold growth under the carpet. You need a good dehumidifier to do this. Another make of powerful...
  2. I forgot to ask about the what is on the floor. ...

    I forgot to ask about the what is on the floor. Walls and the concrete floor are able to collect condensate when the indoor dew point is near or above the any surface temperature. With wood or...
  3. What is the climate? Any fresh air ventilation?...

    What is the climate? Any fresh air ventilation?
    Regards TB
  4. Replies
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    This is a good setup for dehumidification. If...

    This is a good setup for dehumidification. If you had a high cooling load to keep the unit operating at 75^F return temp, you would be at <50%RH. Add a whole house dehumidifier and you will have it....
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    Keep your a/c simple is you have nat gas...

    Keep your a/c simple is you have nat gas available. Include fresh air ventilation to purge indoor pollutants and renew oxygen. Minimum of merv 11 air filtering on fresh air and house recirculating...
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    There is a good possibility that the a/c needs a...

    There is a good possibility that the a/c needs a proper setup. The cooling coil temperature needs to be cold enough to remove moisture. At 75^F return air, the coil temperature should be 45-50^F. ...
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    During high cooling loads, expect 50%RH from a...

    During high cooling loads, expect 50%RH from a properly setup and 20% oversized a/c. As the sensible cooling decreases, the %RH will increase. With low/no sensible cooling load, the indoor %RH is...
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    You have a moderately air tight home. On an...

    You have a moderately air tight home. On an average winter day with an average wind you are getting an air change in 5 hours. This a minimal fresh air infiltration/ventilation to purge indoor...
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    Do not forget fresh air ventilation along with...

    Do not forget fresh air ventilation along with supplemental dehumidification if located in a green grass climate.
    Check out the Ultra-Aire whole system dehumidification/ventilation to avoid rust and...
  10. Nice graph, what kind of data logging? Looks...

    Nice graph, what kind of data logging?
    Looks like is not functioning. Is the unit operating continuously? What is the temp/%RH coming out of the dehu? I suggest setting the control to provide...
  11. What is your climate? Regards TB

    What is your climate?
    Regards TB
  12. Single speed a/c are best for reliable...

    Single speed a/c are best for reliable distribution of amounts of cold air throughout the space. Multi-Speed systems have different amounts of cold air to the space. This not ideal. Are you...
  13. In addition to the lower temperature, expect much...

    In addition to the lower temperature, expect much higher %RH. Also expect even higher %RH under the carpeting or other insulating materials over the cooler concrete.
    It is important to monitor...
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    A fresh air change in 4-5 hours, Merv 11 air...

    A fresh air change in 4-5 hours, Merv 11 air filtering, and maintain <55%RH are a good starting point for good air quality. The fresh air change rate purges indoor pollutatns and renews oxygen. The...
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    I knew there was something I liked about you. ...

    I knew there was something I liked about you.

    Imagine, "I build the perfect home, not too tight/not loose, just right".
    The main pressure that forces air through a home is wind. A 20 mph wind...
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    To me, it appears that the a/c cooling coil...

    To me, it appears that the a/c cooling coil should be cold enough to provide enough latent removal to maintain the %RH after an extended cooling run like an hour or so. You want 75^F, 50%RH, which...
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    Would you mind expanding on this? Infiltration...

    Would you mind expanding on this? Infiltration rates are all over the place depending on wind, stack effect, and mechanical devices. Calm winds and moderate temperature are near zero air changes...
  18. I have monitored a home in Allentown, Pa for...

    I have monitored a home in Allentown, Pa for years. Size the heat pump for the winter load. The idea that a under heat pump will keep a home dry during the cool, damp spring/summer/fall weather is...
  19. Replies
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    4 ton single stage and a small whole house...

    4 ton single stage and a small whole house dehumidifier will give you perfect control during all conditions. Smaller two stage will not give ideal temp during hot weather and company. Plus during...
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    There are many days/nights that you have very...

    There are many days/nights that you have very little sensible cooling loads with high latent cooling loads. That is why I suggest the need for whole house dehumidifier to maintain <55%RH in the...
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    Three choices: Monitor the CO2 levels to...

    Three choices:
    Monitor the CO2 levels to determine the amount of fresh air passing through the home when occupied. If the CO2 levels are <650 ppm when one person is in the home, you are getting...
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    Go single stage with ideal size HP. Include a...

    Go single stage with ideal size HP. Include a small Goodman whole house dehumidifier for best %RH control for low/no cooling loads and +60^F outdoor dew points. During this condition, you end up...
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    Sorry, I over reacted to "Open a window or two...

    Sorry, I over reacted to "Open a window or two when weather permits" as a preferred method of fresh air ventilation.
    I have relatives, friends, and aquantiences that have died or been ill from...
  24. Replies
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    Ok, we will put you down as a definite a maybe...

    Ok, we will put you down as a definite a maybe not needing fresh air ventilation.
    1,000 ppm CO2 is 15 cfm of fresh air per person. A healthy home needs an air change in 4-5 hours. This will purge...
  25. Replies
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    Opening windows is crude. Wind blows, you get a...

    Opening windows is crude. Wind blows, you get a lot of air, winds calm you get little. No real air filtering. You need a steady, low flow, like 50-90 cfm of filtered fresh air blended into you home...
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    Ok. This will work for main open part. Do you...

    Ok. This will work for main open part. Do you plan on operating the air handler blower when occupied? If yes, ok for circulation of fresh air and dry air throughout the spaces. No problem.
    Regards...
  27. Replies
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    Good to have output of the dehumidifier ducted...

    Good to have output of the dehumidifier ducted into the supply duct of the a/c. The return to dehumidifier drawing air from the open space. This will provide distribution of the dry air to all...
  28. Replies
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    Most homes get enough fresh air during winter...

    Most homes get enough fresh air during winter weather. The stack effect combined with normal winds force more fresh air through a home than in the mild calm summer weather. The net result is that...
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    Make the fresh air intake a 6" damper with a...

    Make the fresh air intake a 6" damper with a damper to balance the flow. You 50-60 cfm of fresh air when the home is occupied. If you have ducted returns from each room to the air handler, you may...
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    I agree with the other posts about fresh air...

    I agree with the other posts about fresh air ventilation. Figure on a fresh air change in 4-5 hours to purge indoor pollutants and renew oxygen. You also have exhaust equipment that need make-up...
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    Refrigeration dehumidifiers will not remove...

    Refrigeration dehumidifiers will not remove moisture when less than 40%RH. You will need a dessicant dehumidifier for that application. Why do you need <40%RH?
    Regards TB
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    As you tighten up your home, fresh air...

    As you tighten up your home, fresh air infiltration is reduced to near nothing. All homes need a fresh air change in 4-5 hours to purge indoor pollutants and renew oxygen. You also need <55RH...
  33. Replies
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    Will not argue about the amount of fresh air. ...

    Will not argue about the amount of fresh air. How about fresh air ventilation when occupied and lack of wind? Any recommendations on mx %RH for extended periods? How do you view the change in FL...
  34. Wow! Nobody likes to get into a can of worms. ...

    Wow! Nobody likes to get into a can of worms.
    About fresh air and humidification/dehumidification.
    The amount of fresh air infiltration a home depends on the wind velocity, density of the air in...
  35. Replies
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    You thoughts on fresh air ventilation for indoor...

    You thoughts on fresh air ventilation for indoor air quality and supplemental humidity control in green grass climates?
    Regards TB
  36. Replies
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    If your looking for 75^F, 50%RH inside, you need...

    If your looking for 75^F, 50%RH inside, you need a 50^F cooling coil temp. With long runs, you will the desired 55^F indoor dew point you need. Measuring air flow is difficult at best. Measuring...
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    I missed this post when I posted. This a good...

    I missed this post when I posted. This a good install idea.
    Keep us posted. I assume you in the IN area?
    Regards TB
  38. Replies
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    I would like to hear a little about your fresh...

    I would like to hear a little about your fresh air ventilation system that you need are a well designed air tight home.
    Regards TB
  39. You are right about the condensation problem...

    You are right about the condensation problem should show up where the duct lays on the insulation. End of story.
    Regards TB
  40. Replies
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    Instead of insulating the ducts in the basement,...

    Instead of insulating the ducts in the basement, get a good dehumidifier like the Santa Fe Compact to maintain <60%RH in the basement which keep the basement useable and mold free. Keeping your...
  41. My compliments on your success with air...

    My compliments on your success with air tightening of your home.
    Moisture levels during known outdoor dew points and the number of occupants are good indicators of the air changes a home...
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    What's a vape shop?...

    What's a vape shop?
    http://www.nanasvapeshop.com/pages/our-story
    This can not be good for you.
    I suggest a minimum of 25 cfm per occupant of fresh make air.
    In a green grass climate, you will...
  43. It is the dew point of the air in the attic. If...

    It is the dew point of the air in the attic. If the vapor barrier gets below the dew point of the air in the attic condensation will accumulate on the damp side of the vapor barrier. The dew point...
  44. Sorry about the lack of response. I would keep...

    Sorry about the lack of response. I would keep my fresh air ventilation separate from the fancy t-stat. They are complicated. Get a timer controlled for the ERV. Important to have fresh air...
  45. Thread: New House

    by teddy bear
    Replies
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    402

    How are you dealing with fresh air ventilation...

    How are you dealing with fresh air ventilation and humidity control when you have high outdoor dew points and low/no cooling loads?
    Regards TB
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    Thanks for posting. A fine point, condensation...

    Thanks for posting. A fine point, condensation occurs when the dew point of the air near the surface of the material is above the surfaces temperature. It has nothing to do with temperature of the...
  47. The dehumidifier air is a warm season solution,...

    The dehumidifier air is a warm season solution, spring/summer/fall seasons. During winter, the infiltration of dry outside air will dry the space. More humid house into the cold space will make it...
  48. If any high dew point outside air gets in the...

    If any high dew point outside air gets in the space, the space may be damp. A little dry air from the dehumidifier in the home would take care of the problem. Or not store anything that would be...
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    What the hell. A Honeywell is a good dehu too. ...

    What the hell. A Honeywell is a good dehu too. Hope he gets it hooked up ok.
    In 25 years of building dehumidifiers, I never heard of your a/c contractor. This does not make him good or bad....
  50. Drawing air from the mainfloor and supplying dry...

    Drawing air from the mainfloor and supplying dry air through the furnace ducts passes through the home to the dehu return. The results is a dry home.
    Dealing with a high capacity exhaust hood is a...
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