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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.

No, running your furnace without an air filter isn’t better than running it with a dirty filter. Even if it’s dirty, a filter will still prevent particles from blowing around your ducts and your house. However, neither of these options is good for your furnace or your health. Replace your filter once every one to three months for optimal furnace performance and air quality.

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.

In-home air purifiers really do work. However, their value depends on what you're trying to achieve. Mechanical air filters other than those with true HEPA filtration aren't capable of removing bacteria and viruses from the air. However, many of them can reduce very fine particles, including pollen, a known allergen. On the other hand, UV light filters can remove harmful pathogens but can't remove particles.