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Lot of different forces at play that will change that equation. We use vent covers and the little fuzzy pillows in the vents to keep the hot air out. Heat index in our area was 121 yesterday with the actual tem over 110. My inside tem was never higher than 84 with 33% humidity (we still cook for dinner and run the coffee pot) so I don't think I want to let any of the heat or humidity in. It also makes a difference if there is wind blowing. We had 10-15 MPH winds from the south which would have push air in my vents if they were open.
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