Hi Daox,
I may have sounded more confident than I was about the adequacy of a bath fan to bring down the air. What I've been thinking about recently is using a 130 cfm Panasonic fan in full ON mode rather than the SLOW mode. The beauty of those fans, besides being efficient, is that they are built to compensate for a somewhat tight house. That is, it will use up to double or triple the power in watts to keep the air moving at the rated CFM when things are tight. I'm hoping that at the full rated 130 cfm, and the ability to compensate for high equivalent wg air friction in the house, that one fan in my relatively small, open plan house will be sufficient.
That also brings up the whole issue of controlling the fan and the duty cycle of the fan. Since I really only want the fresh warm air to come in when the air is actually warm maybe it makes sense to use it on high for a limited amount of time and not at night when the air might be cold. It would depend if you have heat storage. I don't. A lot of the answers to the questions just depend on trial and error. If you plan on going ahead with outsulating your house envelope then it might be worth putting off some of the ripping and tearing until then. You'll then have a good baseline to incrementally increase the airflow as needed.
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