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Don't the HVAC guys frown on whole house fans, seeing how they suck in fresh air through the windows and all?
 

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Whole house fan?

We usually make them hinge up so they can drop bats down on the louvers in the winter.. Good idea to add a switch up there so it can't be accidentally turned on in the winter.
 

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I've always seen a fiberglass batt layer on top of the louvers during the winter
 
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