[Greenbuilding] HRV or ERV

[jfstraube]

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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