[Doug]

IMO,
If you live in a cold climate and not on the coast, save yourself a headache and install an HRV. If you search them on here, you will find a couple of dandy threads on them and all the happy aquarists that installed one.

Of course if one lives in an older leaky house then its another story but if the house is well sealed, it requires ventilation.

I,m not sure, how running a dehimidifier is cost effective, esp. when compared with an HRV. They must be one of the most non cost effective ways of removing humidity, although, yes, they work good.

I do know of several aquarists who vent their hoods outside. Some in colder climates have dampers on them to redirect heat into the house on cold days but not sure how that removes the moisture, unless its not a problem. I think if vented out as you described, just some form of air replacement into the room that can be dampered is fine.

Still say in the long run, a HRV is the best way to remove humid stale air and bring fresh air back, {in a cost efficient manner} into a house, in the cold season. With central air, no problems in the hot season.