While most of us understand it’s necessary to replace the air filter, we may not understand the recommended frequency. Some air filter packages actually say to renew every month.
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However, depending on the quality of the product you buy and your usage, you can go up to three months (or longer!). Factors of usage include how often you use your system, if your home have pets, the amount of dust in your home and how large your family is.
Filters with a higher Minimum Efficiency Reporting Value (MERV) rating hold more containments, so consider this with your next purchase. It correlates to better quality and will last longer.
If there’s ever any doubt, the best way is to check your filter yourself. Hold it up to light, and if you can’t see through it – it’s time for a new filter.