What Do AC Filters Do?

What Do Those Air Conditioner Filters Do?

The job of the filter is to remove particles from the air stream to both keep the air conditioning system clean and to remove particles from the air.

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Almost every air conditioning system has a filter upstream of the evaporator coil. This can be in the return grille or in special slots in the duct system and can be a fuzzy-looking or a folded paper filter.

As the filter does its job, it gets loaded with more and more particles. This is actually a good thing and makes the system more efficient, but it also increases resistance and reducing airflow. When this happens, it is time to change the filter. How long it will take to happen depends on how dirty the air is and how big the filter is.

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If you don’t change the filter, air flow will decrease and the system won’t perform as well. Not only that, but if the filter is too dirty, it starts to become a source or air pollution itself.

If you take the filter out completely, you would solve the low air flow problem, but this victory would be short lived. The particles that the filter would have taken out will now build up on your evaporator coil and eventually cause it to fail. Replacing it with a new filter is a much cheaper option.

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