Correct, would defeat the purpose. zero vents in the house. Fresh air is dont through exchangers in the HVAC system.

It didnt make sense to me at first that the attic is insulated on the roof rafters. Seems like air conditioning the attic would not be efficient. but it is. you can have a 4000 sq foot house and you bill can be under $150 in the summer. Now thats efficient lol. Typically 10 degree difference in attic. With fiberglass it can 60 or 70 degree difference. Yikes!