[Greenbuilding] Relative humidity in heated houses

[John Straube]

Exactly. Which is why a small de humidifier and ERV works well in those climates. 

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-----Original Message-----
From: Alan Abrams <alan at abramsdesignbuild.com>
Sender: smarbawa at gmail.com
Date: Wed, 27 Oct 2010 11:56:25 
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
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>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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