Quote:
Originally Posted by retiredguy123
How do you know that the fan is not sucking conditioned air from your living space? If the fan creates a negative pressure in your attic, air will be sucked out from any ceiling leak or other opening, not just through the soffit vents.
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If your attic intake vents are open which they should be, these attic fans will not generate enough negative pressure to pull air from the living space. But if you go with a high CFM electric fan, then yes you could exceed the air intake from your soffit vents and create negative pressure or even pull in air through any other non-active roof vents. As far as letting them run in the winter, yes that will help remove moisture that collects in the attic during that time of year.