Controversy
Though every situation is different, there is some controversy about the effectiveness of attic fans. It has been theorized that in some cases the negative pressure that an attic fan produces in the attic can cause conditioned air from living spaces to be pulled into the attic through cracks and lighting fixtures. This loss of conditioned air can negate the energy conservation gains that you might expect to realize by forced cooling of the attic with a fan. There is an extensive discussion thread on the website Hvac-Talk.com here:
Read more about this topic: Attic Fan
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