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Air filters with a MERV rating of 11 or higher need to be changed every three to six months. If your filters are incredibly strained because of environmental factors, such as living in a smoggy, pollen-rich area with a large household, you may need to change your filters every two months regardless of the MERV rating.

According to the Centers for Disease Control and Prevention (CDC), no single water filter or treatment system can remove 100% of contaminants. To find the best filter for your needs, first determine which impurities are most important for you to remove. For example, reverse osmosis (RO) filters are highly effective at removing a wide range of contaminants, including sediment, heavy metals, bacteria, viruses, dissolved salts, and chemicals. However, the RO process can also filter out beneficial minerals like calcium and magnesium. If eliminating bacteria is your main priority, a UV filter could be a suitable choice. Additionally, distilled water is considered the most pure form of filtered water available.

While an air conditioner can temporarily run with a dirty filter, it is not recommended as it will not work efficiently. A dirty filter forces the system to work harder to circulate cool air, leading to reduced airflow, increased wear and tear, and higher energy bills. This added strain can cause the air conditioner to overheat or fail prematurely. Furthermore, a clogged filter may allow dust and dirt to accumulate in your ductwork, negatively impacting air quality. It is more cost-effective to clean or replace filters regularly than to pay higher utility bills and risk needing to replace the entire AC unit.

HVAC pros recommend that you replace your AC filter every one to three months to maintain optimal indoor air quality and ensure your HVAC system operates efficiently. However, factors such as filter type, household size, and environmental conditions may influence the frequency of replacement. Regular filter changes help prevent debris buildup, maintain airflow, and prolong the life span of your air conditioning unit.