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While an air purifier can trap mold spores and stop them from spreading around your home, it’s not the most effective solution for tackling the problem. Mold is caused by excess moisture and humidity, so there’s a good chance you have an issue somewhere else in your HVAC system that needs to be addressed.

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.  

There are several reasons why your furnace filter might get dirty quickly. For example, if you run your furnace often, more air—and therefore, more contaminants—will flow through the system and clog your filter. Having pets is another reason that your filter accumulates dirt quickly. Also, thinner filters will get dirty faster than thicker ones.

Sometimes, you can clean an HVAC filter rather than replace it. If you have a washable filter, also known as a permanent or semi-permanent HVAC filter, wash the filter once per month. However, if you have filters that are not labeled as washable, do not attempt to clean them and reuse them. Many HVAC filters are disposable, and you’ll need to buy a whole new filter to replace dirty disposable filters.