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4) put up fan, connect, test $75-100. So-total About $250-425 with no box there now, plus cost of fixture. A simple install to replace an existing fan, or install where the ceiling box was wired for a fan, would be only about $75-100.) put up fan, connect, test $75-100. So-total About $250-425 with no box there now, plus cost of fixture. A simple install to replace an existing fan, or install where the ceiling box was wired for a fan, would be only about $75-100.
Average Cost to Install an Attic Fan The average attic fan installation cost is $526. Homeowners report that most attic fan installation projects cost between $529 and $715. The minimum paid for such a project was $250, while the maximum reported cost was $910. The need for an electrician or roofer may increase the project cost.