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Some AC filters, known as reusable filters, can be cleaned and reinserted. Most AC filters, however, are disposable and cannot be cleaned. 

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.

No, air purifiers neither cause dry air nor increase the home's humidity levels. They remove allergens and dust but don't alter the water content in indoor air. However, because some air purifiers move large volumes of air, the areas immediately surrounding a portable unit can feel cooler and dryer than the rest of the home.

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.