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Alan-<br>
<br>
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.<br>
<br>
Brian<br>
<br>
<br>
<br>
On 10/27/10 12:30 PM, John Straube wrote:
<blockquote
cite="mid:540973799-1288197062-cardhu_decombobulator_blackberry.rim.net-1903287143-@bda543.bisx.prod.on.blackberry"
type="cite">
<meta http-equiv="Context-Type" content="text/html;
charset=Windows-1252">
Exactly. Which is why a small de humidifier and ERV works well in
those climates. <br>
<p>Sent from my BlackBerry®</p>
<div><b>From: </b> Alan Abrams <a class="moz-txt-link-rfc2396E" href="mailto:alan@abramsdesignbuild.com"><alan@abramsdesignbuild.com></a>
</div>
<div><b>Sender: </b> <a class="moz-txt-link-abbreviated" href="mailto:smarbawa@gmail.com">smarbawa@gmail.com</a>
</div>
<div><b>Date: </b>Wed, 27 Oct 2010 11:56:25 -0400</div>
<div><b>To: </b><a class="moz-txt-link-rfc2396E" href="mailto:john@buildingscience.com"><john@buildingscience.com></a></div>
<div><b>Cc: </b>Sacie
Lambertson<a class="moz-txt-link-rfc2396E" href="mailto:sacie.lambertson@gmail.com"><sacie.lambertson@gmail.com></a>;
<a class="moz-txt-link-rfc2396E" href="mailto:greenbuilding-bounces@lists.bioenergylists.org"><greenbuilding-bounces@lists.bioenergylists.org></a>; Berletts
Straube<a class="moz-txt-link-rfc2396E" href="mailto:jfstraube@gmail.com"><jfstraube@gmail.com></a>;
Greenbuilding<a class="moz-txt-link-rfc2396E" href="mailto:greenbuilding@lists.bioenergylists.org"><greenbuilding@lists.bioenergylists.org></a></div>
<div><b>Subject: </b>Re: [Greenbuilding] Relative humidity in
heated houses</div>
<div><br>
</div>
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?<br>
<br>
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).<br>
<br>
AA<br>
<br>
<b>Alan Abrams</b><b><br>
Abrams Design Build LLC</b><br>
<i>A sustainable approach to beautiful space</i><br>
<a moz-do-not-send="true" href="mailto:alan@abramsdesignbuild.com">alan@abramsdesignbuild.com</a><br>
<a moz-do-not-send="true" href="http://www.abramsdesignbuild.com">www.abramsdesignbuild.com</a><br>
<b>202-726-5894 o<br>
202-437-8583 c<br>
202-291-0626 f</b> <br>
<br>
<br>
<br>
<br>
<div>On Wed, Oct 27, 2010 at 10:21 AM, John Straube <span><<a
moz-do-not-send="true"
href="mailto:john@buildingscience.com">john@buildingscience.com</a>></span>
wrote:<br>
<blockquote>
50 per cent RH in buildings in COLD climates is a major source
of condensation, and thus rot mold and corrosion.<br>
</blockquote>
</div>
<br>
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