If youre 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 dont 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.
Check your filter
Check your furnace filter monthly and change it every three months, depending on the type of filter you use. To do this:
- Turn off the furnace by flipping the furnace switch. It should be on or next to the furnace, and looks like a standard light switch.
- Find the filter service rack or door. This is most likely on the side with the intake and outtake blower fan. Remove the cover.
- Slide out the existing filter and hold it up to the light. If you can no longer see light through it, it’s time for a new one.
Article source here: How To Change a Dirty Furnace Filter
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