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A HEPA filter is a powerful tool for clean air, but the structure doesn’t allow much air to pass through it. That means your HVAC motor must work harder to keep your air pressure consistent, which can result in higher energy bills. That, coupled with the higher cost of HEPA filters, may not make them the best choice for your HVAC system.

As a general rule, HVAC air filters should be replaced every one to three months (or every 90 days). However, the ideal frequency depends on several factors, including the filter type and your home's environment. For instance, if you use thinner filters (1-2 inches deep), have pets, have household members with allergies, smoke indoors, or frequently keep windows open, you may need to change the filter as often as once a month. It's best to follow the manufacturer's recommendation as a guideline and visually inspect the filter monthly to see if it's dirty. Regular filter changes are crucial for maintaining proper airflow, good indoor air quality, and efficient HVAC system operation.

How often you change your air filter depends on your home and lifestyle. Things like how many people are in your home, pets, the season, the size of your home, the air quality where you live, and more all impact your HVAC system. The best practice is using visual indicators to determine when it needs changing by checking if light can pass through it. If you can’t see any light, it’s clogged and needs to be changed.

While a whole-house air purification system is more expensive than a portable or room-sized air purifier, they have very different expectations to live up to. Room-level purifiers are available for well under $100, while whole-house units can cost up to several thousand. For individuals in the home with conditions that warrant the use of an air purifier, balancing needs against budget is necessary to determine if the extra cost of a whole-home system is worth it.