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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.  

The lifespan of a whole-house air purifier or filtration system depends on several factors, but with proper maintenance, they are built to last. A whole-house system that integrates with your home's ductwork can last 10 to 15 years, or even for the entire lifetime of your existing HVAC system. To maximize the unit's lifespan, perform regular cleanings, change filters as recommended, and schedule an annual inspection to catch potential issues early. The system's longevity also depends on its frequency of use and how hard it must work to maintain your desired air quality. For comparison, smaller, portable air filter systems typically last between five and ten years.

You should plan to change your AC unit's filter every one to three months, depending on the manufacturer's recommendations. You should also clean the coils at least once per year, but if you have pets or someone in your household has allergies, you might need to clean them more often. Fortunately, many pros will clean the coils and change the filter for you during an inspection, which you should schedule once or twice per year.

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.