When Should You Change Your Air Filter? Expert Tips and Insights

Have you wondered when or how often you should change your AC system's filter? Here are a few tips to help you out.

The Importance of a Clean Air Filter

Most people understand that a clean air filter is essential for keeping their AC system running at peak efficiency. However, many are unsure how often it should be changed. While filter manufacturers often promote changing air filters every 30 days, it's important to note that this recommendation benefits them as it increases their sales.

Factors Impacting Air Filter Cleanliness

The rate at which an air filter gets dirty depends on the environment and lifestyle of the home where it's used. Some homes can go six months or more without changing the air filter, while others may need to change it twice a month. Key factors that impact this include:

Location of Intake Grills

Intake grills located near the floor are more likely to pick up dirt and debris, causing the filter to get dirty quicker. Conversely, an intake grill mounted in the ceiling will keep the filter cleaner for a longer period due to its elevated position.

Presence of Pets

Pets are a significant source of hair and dirt, which will cause filters to become dirty faster.

Thermostat Set-Point

A home with a higher set-point, such as 79°F, will run less frequently than a home set to 72°F. The additional run time in the latter will result in more particulates passing through the filter, dirtying it quicker.

Duct Leaks

Duct leaks, especially on the return side, will cause a filter mounted in the air handler to get dirty much faster. This is due to the filter pulling in fiberglass, dust, and pollen from leaks in the attic.

Air Sealing

If your home is excessively “leaky” and not properly air-sealed, particulates from the attic will make their way into your home, causing the filter to get dirty quicker.

How Often Should You Change Your Filter?

The short answer is that you should change your filter when it is dirty. We understand this sounds too simple, but there are too many mitigating factors to make a one-size-fits-all recommendation. We suggest a visual inspection every 30 days and changing the filter when it becomes discolored or has debris on its surface.

Conclusion

Regularly checking and changing your air filter is essential for maintaining your AC system's efficiency and air quality. By considering factors such as intake grill location, presence of pets, thermostat set-point, duct leaks, and air sealing, you can better determine how often to change your filter. Remember to visually inspect your filter every 30 days and replace it when it appears dirty. For any questions or assistance, call us at 941-378-2080.