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re: erv selection criteria
17 may 2002
matthew s. whiting  wrote:

>> i suspect that condition is rare enough that an erv won't save much
>> energy compared to a ventilation fan, for all but a few airtight houses 
>> like my late friend dr. bill freeborn's 15 year old underground house
>> near phila, which just sold for a very good price to a bubbly young
>> couple, with its $58 annual (not monthly) electric resistance heating
>> bill :-)
 
>> can we do this above ground, with less-expensive construction?
 
>no.

it takes serious engineering. norman saunders, pe, has done this more
than once in cold, cloudy new england. some of his houses have long
track records, without any backup heating systems. 

nick




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