I think it would be best to make a new thread for pro and con arguments about ASHRAE 62.2 ventilation standards. I am very interested in factual arguments contrary to my thinking. Kmills from Florida has expressed this skepticism about whether a house needs mechanical ventilation at all:
His comments included:
>>ASHRAE 62.2 was developed without doing a cost study of any detail.
>>no wonder states aren't in a rush to make it part of their mechanical code.
My own opinion is that I want *some* additional mechanical ventilation for my own house, but won't try to say everybody should. Yes it is certainly true that outside air carries a latent load which needs to be dealt with somehow. However you deal with it, it will carry an energy cost. Over a long time I have been convinced that Teddy Bear has a powerful point -- that a ventilating dehumidifier is the only technology capable of delivering fresh air without raising indoor humidity.
Here is one article which I find relevant:
'...Until the mid-1970s, building ventilation standards called for approximately 15 cubic feet per minute (cfm) outside air for each building occupant. Following the 1973 Arab oil embargo, however, national energy conservation measures called for a reduction of outside air to 5 cfm per occupant. Experts thought this would be sufficient to ensure adequate health and comfort, but they were quickly proven wrong.'
'Complaints from building occupants increased, becoming commonplace in the 1980s and 1990s and bringing "sick building syndrome" into the public lexicon. In response, the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) has since revised its ventilation standard 62-2001 to provide a minimum of 15 cfm outside air per person, or 20 cfm per person in office spaces. This standard has been adopted by all the major building codes, which in turn have been incorporated into enforceable local building codes.'
If anything I post is misleading or not good info, I strongly request people to post and offer a correction. Better I learn what's right on an online board, than to experience any unnecessary problems with my own house<g>!
I ask Kmills to contribute more to this thread if he feels comfortable doing so. While I was a little hostile on the "Ventilating Dehumidifier" thread, it was personal reasons only. Please accept my apologies for not maintaining a nicer attitude.
Best wishes -- Pstu
[Edited by pstu on 03-10-2006 at 09:38 AM]