Cohousing-L Mailing List: Re: Passive House - energy efficiency

[Elizabeth Magill (pastorlizm]

Our houses have programable fans in the bathroom that can be scheduled to run 
for set times.  

-liz 508-450-0431
Sent from my iPhone
Mosaic commons Berlin ma 

On Aug 23, 2011, at 5:01 PM, "Norman Gauss" <normangauss [at] charter.net> 
wrote:

> 
> How do these tight thermal envelopes solve the problem of indoor air
> quality?  Unless some fresh air is exchanged for stale indoor air, indoor
> air quality is likely to become very unhealthful.
> 
> Norm Gauss
> 
> -----Original Message-----
> From: Fred H Olson [mailto:fholson [at] cohousing.org] 
> Sent: Tuesday, August 23, 2011 1:04 PM
> To: Cohousing-L mailing list
> Subject: [C-L]_ Passive House - energy efficiency
> 
> 
> In her message "Lancaster update, and ..."
> On 19 Aug 2011 Fiona Frank wrote:
> 
>> Lancaster Cohousing is building 34 passivhaus houses and a common 
>> house at Forge Bank on the banks of the Lune River 3 miles outside of 
>> the small north western UK city of Lancaster
> 
> "passivhaus houses" caught my attention since in recent months I have become
> interested in this very high standard or energy efficiency. In the US the
> phrase "passive house" is used widely instead but this term is easily
> confused with the term passive solar building design.  The two terms are
> different.  To further confuse things passive house designs often
> incorporate passive solar.
> 
> The passive house standard was mentioned briefly on cohousing-L previously
> http://lists.cohousing.org/pipermail/cohousing-l/msg30088.html
> but warrants more coverage.  IMHO any new construction should take the
> standard into consideration.
> 
> Excerpt from http://en.wikipedia.org/wiki/Passive_house
> 
> The term passive house (Passivhaus in German) refers to the rigorous,
> voluntary, Passivhaus standard for energy efficiency in a building,
> reducing its ecological footprint.  It results in ultra-low energy
> buildings that require little energy for space heating or cooling.
> 
> Key to achiving the standard is super insulation and a very carefully and
> tightly constructed thermal envelope.
> 
> This and other features result in a conventional central heating system is
> not being necessary.  A typical statement is that a passive house can be
> heated with the equivalent of a hair dryer.
> 
> Passive houses are up to 14% more expensive upfront than conventional
> buildings but this is quickly recouped from energy use savings.
> 
> Retrofitting a house to meet passive house standardds is possible but much
> more difficult than with new construction.
> 
> We had a passive house architect evaluate our house and concluded with him
> that it is not reasonable to retrofit our house to the standard.
> 
> Fred
> 
> --
> Fred H. Olson  Minneapolis,MN 55411  USA        (near north Mpls)
>     Email:        fholson at cohousing.org      612-588-9532
> My Link Pg: http://fholson.cohousing.org         My org:
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