[Greenbuilding] HRV or ERV

[Steven Tjiang]

I stand corrected.  I guess people and their activities provide more than
enough moisture.  I guess that's why ERVs are only recommended for primarily
humid climates where AC are common.

---- Steve (KZ6LSD)


On Wed, Oct 27, 2010 at 6:48 AM, jfstraube <jfstraube at gmail.com> wrote:

> Here Here Corwyn!
> I have that problem. I have an HRV that I can swap cores with to turn it
> into an HRV. I was going to try running an ERV in the winter.  Cant do it,
> since the RH in the house is too high (40's) when it is very cold (0 F/-18c)
> because the house is tight and I ventilate it properly.  This is why I
> always recommend an HRV for really tight, energy efficient houses in colder
> climates (say 5000 F HDD or more).
>
> On 2010-10-27, at 9:38 AM, Corwyn wrote:
>
> > On 10/27/2010 12:05 AM, Steven Tjiang wrote:
> >
> >> However, an ERV will ventilate and help to preserve higher humidity in
> >> an air-tight house during cold, dry winters when there are internal
> >> sources of moisture generation,  i.e moisture from occupants and plants,
> >> as well as regular house hold activities such as cooking, and bathing.
> >>  An ERV probably isn't sufficient on its own to preserve the humidity
> >> but it can help.
> >
> > My experience with air-tight houses in cold dry climates, is that high
> humidity is more the issue than low.  Reasonably normal occupancy provides
> enough or more than enough moisture to offset the losses due to air
> exchange.  Of course, if the ventilation system is cranked way up, it can
> bring the humidity down.  HRVs dominate here in Maine, where people in
> average houses complain bitterly about how this or that 'dries out the air'.
> >
> > Thank You Kindly,
> >
> > Corwyn
> >
> >
> > --
> > Topher Belknap
> > Green Fret Consulting
> > Kermit didn't know the half of it...
> > http://www.greenfret.com/
> > topher at greenfret.com
> > (207) 882-7652
> >
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