[Greenbuilding] Relative humidity in heated houses

[Brian Uher]

Alan-

Yes, the air-tight guest house in Garrett Park has exactly this
combination, and it is performing.  Ductless Mini-split with
de-humidification mode and ERV.  The concern is if the ductless will
maintain de-humidification in spring, the apparent danger time for us DC.

Brian



On 10/27/10 12:30 PM, John Straube wrote:
> Exactly. Which is why a small de humidifier and ERV works well in
> those climates.
>
> Sent from my BlackBerry®
>
> *From: * Alan Abrams <alan at abramsdesignbuild.com>
> *Sender: * smarbawa at gmail.com
> *Date: *Wed, 27 Oct 2010 11:56:25 -0400
> *To: *<john at buildingscience.com>
> *Cc: *Sacie Lambertson<sacie.lambertson at gmail.com>;
> <greenbuilding-bounces at lists.bioenergylists.org>; Berletts
> Straube<jfstraube at gmail.com>;
> Greenbuilding<greenbuilding at lists.bioenergylists.org>
> *Subject: *Re: [Greenbuilding] Relative humidity in heated houses
>
> given the risk of high humidity in cold weather, then what are the
> risks of using an ERV in a tight, well insulated house in a <5000 HDD
> mixed humid climate, but where there are week long periods in which
> the temperature does not exceed 20dF?
>
> The flip side of this of course is that in my region (DC metro area)
> you can insulate and passive solarize until you get the heating load
> down to minimal levels, but you can't budge the latent load in summer
> with your envelope.  (and night air flush does not work well when the
> low is in the high eighties--or even low nineties--and the morning
> humidity could founder small craft).
>
> AA
>
> *Alan Abrams**
> Abrams Design Build LLC*
> /A sustainable approach to beautiful space/
> alan at abramsdesignbuild.com <mailto:alan at abramsdesignbuild.com>
> www.abramsdesignbuild.com <http://www.abramsdesignbuild.com>
> *202-726-5894 o
> 202-437-8583 c
> 202-291-0626 f*
>
>
>
>
> On Wed, Oct 27, 2010 at 10:21 AM, John Straube
> <john at buildingscience.com <mailto:john at buildingscience.com>> wrote:
>
>     50 per cent RH in buildings in COLD climates is a major source of
>     condensation, and thus rot mold and corrosion.
>
>
>
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