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  1. I bet that the cost difference is not just from...

    I bet that the cost difference is not just from operating the AC fan unit, but because the AC compressor also runs more often (not necessarily at the same time) to remove the heat produced by the...
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    "Dehumidification in HVAC Systems" by John Murphy...

    "Dehumidification in HVAC Systems" by John Murphy and Brenda Bradley, Trane Applications Engineering Manual is interesting and discusses what happens depending on how and where you introduce fresh...
  3. Qtina will have to decide between my somewhat...

    Qtina will have to decide between my somewhat sloppy but cheaper upfront approach with long-term ongoing energy expenses, and a more systematic and rigorous process like tedkidd suggests, costing...
  4. Well said, it is the principle I had in mind, and...

    Well said, it is the principle I had in mind, and sounds like an ideal plan.
  5. Charcoal filters as prefilters are a sham....

    Charcoal filters as prefilters are a sham. Charcoal needs to be clean to stay catalytically active; using them as prefilters guarantees that they'll get dirty quickly. Residential HEPA filter...
  6. Spider webs are kind of normal. Outside air is...

    Spider webs are kind of normal. Outside air is filthy IMO, and it's normal to have a lot of dust on the air intake of a 26-year old house. Is the dust inside your house remarkable in any way, i.e.,...
  7. Consider a ducted HEPA filter to bring in fresh air

    Trying to answer the questions in your first post:

    If your house is somewhat leaky, when it's below freezing you most likely don't need to have the makeup air duct open -- there should be enough...
  8. Suggestion: let them rest in peace and save your...

    Suggestion: let them rest in peace and save your money. The "friendly oxidizers" touted by Guardian Air are discussed in that "forum": http://en.wikipedia.org/wiki/Snake_oil :.02:

    You didn't...
  9. Search this forum, there are a number of threads...

    Search this forum, there are a number of threads about it. People who sell it persevere in defending it, and similar technologies, despite all the criticism.

    "It is difficult to get a man to...
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    It sounds like you have the mold issue well under...

    It sounds like you have the mold issue well under control. Fighting allergies can be exhausting and affect one's health for a while. Colds, strep throat, ear infections have different causes, but I...
  11. Thread: Skuttle?

    by pmeunier
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    Regretted buying a Skuttle...

    I once had a Skuttle in my house to bring in fresh air. It had problems with condensation and ice like you describe. You can't wrap it in insulation because the counterwight needs to move freely. ...
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    My point is more that regardless of which...

    My point is more that regardless of which combination of equipment and remediation you use to get the humidity down to 50%, allergens aren't going to immediately vanish. Even after the mold stops...
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    Good point -- for some reason I thought he meant...

    Good point -- for some reason I thought he meant he got rid of the carpet, but he does say "replaced". Yes, the new carpet likely grew mold as well. The carpet itself may even be helping the mold...
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    Try to set the Prestige ventilation to a multiple...

    Try to set the Prestige ventilation to a multiple of the sq footage of the house. If that doesn't help, perhaps something is broken.
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    I'm not a professional but based on what I do...

    I'm not a professional but based on what I do know, obsessed about and experienced, I suggest 1) moving, or 2) getting humidity <= 50% everywhere (basement and crawlspace included) and running a...
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    The intake of the filter is connected to the...

    The intake of the filter is connected to the outside of the house, to bring in fresh air. The supply/exhaust (clean air) should be connected in some manner to a whole house dehumidifier or the...
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    Nervermind, I'm wrong about desensitization. The...

    Nervermind, I'm wrong about desensitization. The immune response is changed. I wonder though about a cure that's not permanent.
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    Correct, bypass installation is not the only way...

    Correct, bypass installation is not the only way to install the unit, but it is the default (easy) way for the "install-and-run-away" (turnkey) part of the HVAC industry. They do it because it's...
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    OMG, this is the worst info. Breathing ozone is...

    OMG, this is the worst info. Breathing ozone is bad for you, ozone generators in homes are bad news. There's no such thing as too clean; the "shock" is a realization of how much stress your body...
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    Fantech is a very well known brand, use google...

    Fantech is a very well known brand, use google shopping and you'll see it's available at Pex Supply and other good stores. Their whole house HEPA filter isn't perfect but it's a good value.

    The...
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    Not snake oil, but the effectiveness of the...

    Not snake oil, but the effectiveness of the PureAir compared to the MERV 16 alone would depend a lot on you and your son's sensitivities to chemicals. If you wear cologne, and your wife and daughter...
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    yes. It's very noisy at full power and brings in...

    yes. It's very noisy at full power and brings in more air than necessary so I use an autotransformer (variac) to control the speed.
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    I've also used a Climate Right sitting outside to...

    I've also used a Climate Right sitting outside to bring in outside air, cooling and dehumidifying it before it is pushed inside. Dehus aren't the only way to get the job done, especially if you have...
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    yes, I meant a HEPA filter with its own fan,...

    yes, I meant a HEPA filter with its own fan, running independently of the furnace. For example, the Fantech "Whole House HEPA" filter.
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    No, I don't think it's premature at all. You're...

    No, I don't think it's premature at all. You're correct, you could reduce PM 2.5 particle counts (I suggest getting a Dylos particle counter if you want to know how effective your measures are). ...
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    Early morning is when outside humidity is the...

    Early morning is when outside humidity is the highest. I bet the humidity in your basement in the early morning is 65% or higher -- that's too high. See if your basement is under negative pressure...
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    The Williams will most likely blow too much air...

    The Williams will most likely blow too much air in your control room without being able to dry it enough. You don't need much positive pressure to make a large difference in the infiltration rate. ...
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    Forget it

    You'll get better results from a $300 Fantech HEPA setup to pull air from outside, filter it, and discharge clean air in the house. The positive pressure will prevent a lot of infiltration. The...
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    ejectionseatfixer, for the life of me I can't...

    ejectionseatfixer, for the life of me I can't figure out why people peddling these and similar products spreading reactive chemicals in the air are allowed to do so. "quackery's salient...
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    That's wrong if it's a pleated filter. All else...

    That's wrong if it's a pleated filter. All else being equal, the greater the surface area of the filter, the better. Thicker pleated filters have more filter area (unless the number of pleats is...
  31. Thread: GPS-2400

    by pmeunier
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    Abusing this forum with ads demonstrates a...

    Abusing this forum with ads demonstrates a deficient moral compass.
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    A good way to get a clue as to what's going on is...

    A good way to get a clue as to what's going on is to measure CO2 (e.g., co2meter) and particulates (e.g., Dylos).
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    Pedantic

    pushed, pulled -- one is a pedantic explanation and the other is practical and useful. It's very much like the discussion about centrifugal force. Academics will argue that there's no such thing. ...
  34. Thread: GPS-2400

    by pmeunier
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    see this thread:...

    see this thread: http://hvac-talk.com/vbb/showthread.php?1173981-RGF-REME-or-APCO-Air-Purifier-experiences
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    Not HEPA

    MERV 11 isn't a HEPA filter -- not even close. It's so wrong, I wouldn't shop at filtersamerica.com. What else will they also tell you that's wrong?

    I am not familiar with the Trane Clean...
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    Thanks. What I'm reading so far is evidence of...

    Thanks. What I'm reading so far is evidence of toxicity to micro-organisms and chemical reactions powerful enough to destroy whole classes of compounds. There's also a small increase in ozone, to...
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    I'm interested; I'd like to read a scientific...

    I'm interested; I'd like to read a scientific study supporting those claims. Thanks
  38. Replies
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    Will wonders never cease? Lookup oxidative...

    Will wonders never cease? Lookup oxidative stress:
    http://en.wikipedia.org/wiki/Oxidative_stress

    The free-radical theory of aging:
    http://en.wikipedia.org/wiki/Free-radical_theory_of_aging
    ...
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    Good place for a wind chime

    :grin2:315651
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    AftMktGuy, we've been through this dozens of...

    AftMktGuy, we've been through this dozens of times with other people and this one or similar technologies and sorry, but you didn't bring anything useful or scientific to the discussion. Oxidation...
  41. 1. Get a second house inspector. 2. Your...

    1. Get a second house inspector.

    2. Your basement will get some water infiltration at some point, and it will be cold and humid all the time. I strongly suggest discharging most or all of the...
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    That could be the compressor cycling on and off...

    That could be the compressor cycling on and off while the fan keeps running, re-evaporating water on the coil.
  43. Because the law is poorly worded, perhaps you do...

    Because the law is poorly worded, perhaps you do need 12 outside ACH just to avoid the cost of silly lawsuits, and the risk of jury awards, regardless of scientific basis. I'm not a lawyer.
  44. 12 ACH of HEPA filtered air (which is what I...

    12 ACH of HEPA filtered air (which is what I would call ventilation) for a newborn nursery makes sense to me, to capture dust, allergens and airborne pathogens. However I can't imagine why you'd...
  45. I found this interesting HHE (Health Hazard...

    I found this interesting HHE (Health Hazard Evaluation) report:
    http://www.cdc.gov/niosh/hhe/reports/pdfs/1991-0187-2544.pdf

    ASHRAE Ventilation Evaluation Criteria
    Newborn nursery
    Outside air...
  46. 12 ACH of fresh air is a ridiculously high...

    12 ACH of fresh air is a ridiculously high number, even taking into account that a nursery is a poop factory.
  47. Great... However, changing the thermostat fan...

    Great... However, changing the thermostat fan setting to "auto" is most likely responsible for the majority of the change. Keep in mind also that with the vents closed you'll still need to measure...
  48. Consider moving one of the 2 dehus from the...

    Consider moving one of the 2 dehus from the living area to the crawlspace. You'll have less noise and it will probably be more useful there.
  49. Once you're happy with the humidity level in the...

    Once you're happy with the humidity level in the house, measure what it is in the crawlspace. You can get water vapor in the crawl space from the ground or from infiltration from outside air. If...
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    TB, your sarcasm might confuse beginners... To...

    TB, your sarcasm might confuse beginners...

    To the OP: bringing any humid air into your home will increase the humidity. Using an ERV to do so is better than using a fan, but it still brings in...
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