<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html><head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head>Exactly. Which is why a small de humidifier and ERV works well in those climates. <br/><p>Sent from my BlackBerry®</p><hr/><div><b>From: </b> Alan Abrams <alan@abramsdesignbuild.com>
</div><div><b>Sender: </b> smarbawa@gmail.com
</div><div><b>Date: </b>Wed, 27 Oct 2010 11:56:25 -0400</div><div><b>To: </b><john@buildingscience.com></div><div><b>Cc: </b>Sacie Lambertson<sacie.lambertson@gmail.com>; <greenbuilding-bounces@lists.bioenergylists.org>; Berletts Straube<jfstraube@gmail.com>; Greenbuilding<greenbuilding@lists.bioenergylists.org></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 clear="all"><b style="color: rgb(0, 102, 0);">Alan Abrams</b><b style="color: rgb(0, 102, 0);"><br>Abrams Design Build LLC</b><br style="color: rgb(0, 102, 0);"><i style="color: rgb(0, 102, 0);">A sustainable approach to beautiful space</i><br style="color: rgb(0, 102, 0);">
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<br><br><div class="gmail_quote">On Wed, Oct 27, 2010 at 10:21 AM, John Straube <span dir="ltr"><<a href="mailto:john@buildingscience.com">john@buildingscience.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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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