Monthly Archives: July 2011

When to Change Air Conditioner Filters

While most of the country is enduring an extreme heat wave, this is a good time to point out that air filters need to be changed more often in summer in central air conditioning systems. A general rule of thumb is that they should be changed every 1-3 months. Follow these rules:

1. Inspect your air filter monthly and only change it if it looks dirty. See the photos below and compare.

1. Write down the dates when you change your filters, and you will get a better idea of what is normal for your home. You will notice that in spring and fall you can get by changing the filters less. Your filter will get dirtier if you have pets, live in a high pollution area, or like to keep the windows open. This includes your balcony window.

3. Avoid purchasing low-end filters. Instead, choose ones that have a higher MERV (Minimum Efficiency Reporting Value). These high efficiency filters will do a better job, but will need to be replaced more often.

Also see our post Change Your Furnace Filter for a Cleaner Home

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