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.