The school board selection commission may, at the option of the governing body of the county, appoint a qualified voter who is a resident of the county to cast the deciding vote in case of a tie vote of the school board as provided in § 22.1-75. The term of office of each tie breaker so appointed shall be four years whether the appointment is to fill a vacancy caused by expiration of term or otherwise. The commission shall give the notice required by § 22.1-37 before appointing any tie breaker.