If you’re thinking you only have to change your furnace filter once a year, you may be shortening the life of your furnace. Many costly furnace repairs can be avoided with regular filter changing. If you don’t change the filter, lack of airflow will cause the furnace to overheat and shut down. Similarly, a dirty filter can stop an air conditioner because the coils freeze up due to inadequate airflow. Both issues stress the system.ncG1vNJzZmivp6x7p63MoqOyoJGjsbq5wKdlnKedZL2zu8memq1nmKTEbsDOZpqhmZ6csm6tjJ2gq6ypYrO2vs2amp5llp65tbHRaA%3D%3D