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re: insulation + vapor barrier (new seattle home)
9 jun 2005
>...you won't save much with an hrv box, compared to an exhaust fan, imo.
>if a 2000ft^2x16' "airtight" us house naturally leaks 0.5 ach, ie
>0.5x2000x16/60 = 200 cfm, enough for 13.3 ashrae-standard full-time
>occupants, you will rarely need mechanical ventilation. how many days 
>per year have no wind and equal indoor and outdoor temps for more than
>an hour or two? 

and what do you gain by running an hrv with equal indoor and outdoor temps?

nick

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