You might not think about it, but the air filters in your home are like huge dust rags that collect all the dirt and dust that travel through your home. With an efficient air filter, you should be changing it every month! Having the filter fill up can cause numerous issues such as poor operating efficiency, the efficiency goes down and your costs will increase, and if you suffer from allergies or have other health concerns a dirty filter will only make your health issues worse. Filters take all the dirt away and by not changing it at the proper time will only allow the air in your home to become dirtier. 
Set a reminder for yourself! As soon as you change your filters, add it to your calendar to check the status of it a month later.
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Photo | The old Hepa air filter | by Joshua Marks | Used under a Creative Commons Attribution Share-alike license