The answer to 'best air filter' is that the best air filter for your home will depend on your specific needs and the type of HVAC system you have. In general, HEPA (High-Efficiency Particulate Air) filters are considered some of the most effective at removing small airborne particles like dust, pollen, and pet dander. Pleated filters are also a good choice as they have a larger surface area to capture more contaminants. The MERV (Minimum Efficiency Reporting Value) rating indicates the filter's ability to trap particles, with higher MERV ratings (13-16) capturing the smallest particles.
When choosing an air filter, consider factors like the size of your HVAC system, the level of air filtration needed in your home, and the recommended filter type for your system. It's also important to change your air filters regularly (every 1-3 months) to maintain optimal performance and indoor air quality.