Attic venting is to remove moisture from the attic and also keeps the attic cool to prevent ice dams once melted snow reaches the eaves. If you aren't in an area that has much snow, which you probably aren't since you said 20 degrees as an overnight low, that might not be a problem but the moisture issue likely is still an issue and could cause serious mold issues in the attic. How are you planning to handle that?
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