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Thanks to each of you for your responses. One concern with the whole house is having the windows open. Not a good idea during pollen season. Some say open the windows, some say not necessary. It is all very interesting. Thank you.
The attic vent will get rid of the hot air in your attic, but you will need some sort of cooling to the upstairs to make that area livable.
If the pollins in your area are a problem, I guess, it is a matter of how much does it bother you.
The attic vent fan is just that. It pulls outside air into the attic lowering the attic temps so it makes it easier for the insulation to do its job.
Currently the new methods of ventilation does not suggest a attic fan, in fact its frown upon as it uses energy not needed if the attic is properly vented both along the soffit and ridge of the home. As a home energy company, we try to foam the back side of the roof and seal off the entire soffit area with spray foam. We get over R-32, no issues with moisture and if HVAC equipment is located in the attic space it brings it into the building envelope which lowers its load requirements close to 25%, meaning you can get away with smaller more efficient equipment.
My husband SWEARS that by closing some of the air vents downstairs forces more of the cool air upstairs. Can't really say I've noticed any difference but then I think it's a "guy thing"!! LOL