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Question:

Which is better for attic ventilation: a Whirlie Bird or an electric mechanical exhaust fan?

I have to have something installed on my roof to ventilate the attic A CH/A guy told me not to get the electric mechanical exhaust fan instead of a Whirlie BirdIt seems the electric exhaust fan would make my electric bill go up? Anyway, I know nothing about this and just wanted some good advice and your opinions.

Answer:

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To be perfectly honest Sophie, I wouldn't choose eitherHere's whyIf your issue is attic heat getting into the house, upgrading your attic insulation to R40 or R50 will go a long way insulating your ceiling from the attic heatSecond, you need airflow in your attic to remove heated air and replace it with cooler airIf designed properly, natural convection should do a good jobYou need soffit vents under your eaves about every four feetThey must not be blocked by attic insulationThere are soffit ducts that keep insulation away from the soffit ventsThe second part of the solution is an exhaust port for the hot airThe most efficient is a roof ridge ventIf this is not feasible, then gable vents at the ends of your house will also workRemember, you don't need to get a hurricane blowing in your attic, you just need to keep the air movingWith natural convection, the hotter it gets, the faster the air will move on its ownPrairie dogs have been successfully using a similar technique to cool their burrows for thousands of yearsI've never heard of any of them being hooked up to the utility company for air conditioningThe basic rule is that cold air comes in at the bottom, and warmer air exits at the top.

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