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  1. Replies
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    What is you climate and where are located? The...

    What is you climate and where are located? The configuration of you building and location in it?
    Regards TB
  2. Replies
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    139

    Exposed earth looks dry but is supplying several...

    Exposed earth looks dry but is supplying several lbs. of moisture per hour. Also open vents are wetting or drying depending on the moisture in the outside air.
    The sure way to control a...
  3. Replies
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    If you can identify that warm air blowing to the...

    If you can identify that warm air blowing to the outside back through the supply, a back drafty is suggested. Home that are this air tight need mechanical fresh air ventilation whenever occupied....
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    Moisture on windows? A 1" sweat band is that does...

    Moisture on windows? A 1" sweat band is that does not drip would be max. Dripping windows, operate HRV until the windows stop dripping. 35%RH could be a good number. Avoid deep t-stat setback on...
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    Your unit has a good air filter. Most suggest...

    Your unit has a good air filter. Most suggest operating your air handler on the Low speed fan for complete mixing and circulation when the HRV is operating. Most suggest ventilating when the home is...
  6. Most dust that enters your home never makes it to...

    Most dust that enters your home never makes it to the air filter in your air handler. Instead is settles on the horizontal surfaces of the home. A good vac is more important than the air filter. ...
  7. Replies
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    674

    Netamo for the money is great gadget to...

    Netamo for the money is great gadget to understand air change rates during actual living and weather conditions. The sensors are not the greatest, but for the money , fantastic. Good data logging...
  8. This is tricky business. Where is the strip heat...

    This is tricky business. Where is the strip heat located in relation to the cooling coil?
    Regards TB
  9. Replies
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    This a plumbing problem. The heat exchanger has...

    This a plumbing problem. The heat exchanger has a drip rail that is connect to the drain tube. The drip rail should be located under the center of the heat exchanger. Also the tube can be air...
  10. 537111 I am inserting some data that show...

    537111

    I am inserting some data that show occupancy of 2 during the day.
    Regards TB
  11. Replies
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    260

    ERV or HRV? HRVs will have condensate dripping...

    ERV or HRV? HRVs will have condensate dripping from the drain. ERVs not so much.
    Regards TB
  12. Replies
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    For fresh air ventilation, I like to use a...

    For fresh air ventilation, I like to use a occupancy for when to provide fresh air. No sense to ventilate when the home is routinely not occupied. The DEH 3000 control by Ultra-Aire offers routine...
  13. Could be that the CO2 sensor is not temperature...

    Could be that the CO2 sensor is not temperature compensated. Also CO2 builds up in occupied areas during times when the heating is off. The blower mixes the CO2 with the rest of the home. This...
  14. Replies
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    The Ultra-Aire has been sold for 20 years and has...

    The Ultra-Aire has been sold for 20 years and has the highest Energy Star rating in the world.
    Aprilaire is a good old company but a recent manufacture of dehumidifiers.
    Get the best dehumidifier...
  15. Replies
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    You need a filter that removes gaseous material. ...

    You need a filter that removes gaseous material. Activated charcoal+ is needed for removing smoke. Merv 12 is good. A 2" bed of charcoal the type of media for smoke.
    Make-up a 6" fresh air...
  16. Replies
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    Getting fresh air in two times a day is not good...

    Getting fresh air in two times a day is not good ventilation. You need a fresh air change in 4-5 hours on a continuous basis when the home is occupied at a minimum. Use a 4-5 lb. bed of activated...
  17. Replies
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    Good indoor air quality start with a fresh...

    Good indoor air quality start with a fresh filtered air change in 4-5 hours to purge indoor air pollutants and renew oxygen. A good vacuum cleaner and maintaining ,50%RH to avoid growing...
  18. Replies
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    549

    Good point. I am assuming that it is like a...

    Good point. I am assuming that it is like a laundry room with a door open to the home. The dehumidifier is on shelf with the dehu supply through the wall while the return is sucking on the room...
  19. Replies
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    549

    Lets talk. The real benefit of the whole house...

    Lets talk. The real benefit of the whole house dehumidifier is when you are not in your home through the spring/summer/fall. When I am not in my home in Cape Coral, I turn off the a/c and allow the...
  20. Replies
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    549

    Include a whole dehumidifier with the a/c and you...

    Include a whole dehumidifier with the a/c and you will have a system that will maintain dry home with minimum a/c operation. Units like the Ultra-Aire whole house dehumidifiers are ideal to keep...
  21. A 3,500 sqft. home with an air change in 4 hours...

    A 3,500 sqft. home with an air change in 4 hours is about 130 cfm of infiltration/ventilation. This recommended as ideal for indoor air quality to purge indoor pollutants and renewing oxygen....
  22. You need 24/7 operation with high air flow...

    You need 24/7 operation with high air flow through the humidifier. Hot water get 1 lb. per hour extra in to the air . The water flow rate is about 3 gals per hour. 75 gals of hot water a day is a...
  23. Replies
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    1,293

    More insulation will not prevent condensation on...

    More insulation will not prevent condensation on the ducts in the attic. Sealing or constant circulation of warm air are the only this that will prevent condensation. You home is not too wet. There...
  24. Replies
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    1,293

    You need to block any moisture or air movement....

    You need to block any moisture or air movement. Solid foam blocks would be much better, no air or moisture can pass through. Who was the dam fool that put those ducts there in the first place. Call...
  25. Replies
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    Here is the beauty of CO2 monitoring. Using the...

    Here is the beauty of CO2 monitoring. Using the outside CO2 levels as 450 PPM and the number of occupants, you can calculate the cfm of fresh air passing through the home.
    Assuming CO2 at 450 ppm...
  26. The unit sets along side of your a/c. Preferred...

    The unit sets along side of your a/c. Preferred to connect an independent return from the open part of the home to the dehumidifier and a supply from the dehumidifier to the a/c supply. There are...
  27. Replies
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    The total cost of a 100 cfm of fresh air is about...

    The total cost of a 100 cfm of fresh air is about $200 for a year in heating or cooling climates. Adding an ERV reduces the cost by $100 at the most. Considering all cost, maybe a 10-20 year...
  28. Replies
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    A good start. How much fresh air is coming into...

    A good start. How much fresh air is coming into your home? You need 80 cfm when the home home is occupied. So fresh air on and hope there is adequate flow. Probably during cold windy weather you are...
  29. Replies
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    This is a good post. Fresh air change is most...

    This is a good post.
    Fresh air change is most critical to purge indoor pollutants and renew oxygen to maintain max indoor air quality. You need a minimum of a fresh air change in 4-5 hours. ...
  30. We are not sure about your humidity question?...

    We are not sure about your humidity question? Updating a conditioning system should consider the issue of humidification/dehumidification/fresh air ventilation during the different seasons of the...
  31. Moisture on quality windows during cold weather...

    Moisture on quality windows during cold weather is a sign of low air change. Single pane glass or deep t-stat back or heavy covered windows will also condensate during cold weather, even with...
  32. You have device like the bath/kitchen...

    You have device like the bath/kitchen exhaust/clothes drier need an air source to function. When these are not used, the imperfections in your home will allow the stale air to leak out without...
  33. Replies
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    It can if you want it to. Most fresh air...

    It can if you want it to. Most fresh air requirements are needed regardless what the outdoor moisture content. Good fresh air machines deal with the adding or removing moisture from the fresh air....
  34. Replies
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    Anytime the outside dew points are high enough to...

    Anytime the outside dew points are high enough to have a wetting effect on a home, dehumidification is needed to maintain <60%rH inside. That includes most green grass climates. <60%RH avoids mold...
  35. Replies
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    Myths are common. No 1 myth. Only air tight...

    Myths are common.
    No 1 myth.
    Only air tight homes need fresh air ventilation.
    Fact is that most home are air tight when the winds are calm and in/outside temps are similar.
    The difference is...
  36. Impressed with your approach to the opportunity...

    Impressed with your approach to the opportunity to end up with a comfortable and healthy home.
    Homes like yours get plenty fresh air during cold windy weather, yet during calm, moderate temps, the...
  37. Replies
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    Typically, 700 ppm CO2 indicates occupancy and...

    Typically, 700 ppm CO2 indicates occupancy and will 25-40 cfm of fresh air per person with a 450 PPM outside CO2 level. Turn on fresh air 700 ppm and off at 600 ppm would a good cycle to avoid over...
  38. I feel sorry for you because nobody has...

    I feel sorry for you because nobody has responded. I have an Inf furnace with a/c. I have had a heat pump. All the comments make sense. On the surface, sounds like it is working ok.
    Hope one of...
  39. Climate? Number occpants? Regards TB

    Climate? Number occpants?
    Regards TB
  40. Replies
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    In the final analysis, a hrv may be ideal. My...

    In the final analysis, a hrv may be ideal. My point was establish how much additional fresh air is needed to fix the problem before spending thousands to fix a problem that needs a couple hours of...
  41. Replies
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    A homes air change rate depends on the wind and...

    A homes air change rate depends on the wind and stack effect and the imperfections in the home.
    During the cold windy weather, Plenty of dry outside air is forced through most homes. Enough fresh...
  42. Replies
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    358

    Most home have excess dry outside passing through...

    Most home have excess dry outside passing through a home during cold windy weather. During summer/fall the homes materials absorb lots of moisture and have high dew points. When the seasons change,...
  43. Replies
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    A little fresh air goes a long way. Also t-stat...

    A little fresh air goes a long way. Also t-stat setback a few degrees over night will increase the condensation. Run the highest bathfan 24/7 for a couple days and monitor the sweat and %RH. 1-2 "...
  44. Replies
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    643

    I suggest that a 150 watt 200 cfm duct fan will...

    I suggest that a 150 watt 200 cfm duct fan will move as much air through the humidifier as a 500 watt furnace blower. Thus you will get the humidification and save 350 watts of electricity per hour...
  45. Unless you have an extreme need for

    Unless you have an extreme need for <50%RH, the UA 70H will do find. You may occasionally see 55%RH, this is seldom a problem. Under typical conditions, the UA 70H will handle upto 2,500 sqft. of...
  46. Replies
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    I suggest the Ultra-Aire 70H that can be...

    I suggest the Ultra-Aire 70H that can be connected to the air handler. It is a high efficiency rugged dehumidifier.

    Regards TB
  47. The +90% furnaces make sense. I suggest single...

    The +90% furnaces make sense. I suggest single speed a/c medium SEER with a whole house dehumidifier if you want low %RH in the lower levels of the home during low/no cooling loads. This will...
  48. 35%RH during extreme cold weather is very good....

    35%RH during extreme cold weather is very good. Higher levels of moisture will cause condensation inside the walls. Be careful about over humidifying.
    Regards TB
  49. Replies
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    The duct pieces that you describe are balancing...

    The duct pieces that you describe are balancing devices.
    http://www.vanee.ca/en/accessory/51-complete-balancing-kit-in-a-tool-box.html
    After you read this, come back with any questions.
    The idea...
  50. It is about the amount of outside a specific...

    It is about the amount of outside a specific moisture level air passing through the home and the moisture added by the occupants at a specific temperature inside the home.
    Some days you have 0-200...
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