Which Filter to Use?
A dirty air filter decreases the effectiveness of your HVAC system because it inhibits airflow and allows dirt, dust, pollen and other materials to blow through the system. The challenge is how often it should be changed to keep the system working efficiently and extend the equipment life. Too often and you’re wasting money and not often enough and your increasing the operating and maintenance costs. Fiberglass panel filters are inexpensive and easy to find but they’re not very efficient and they allow most dust to pass through. They were popular years ago but there are much better products available currently. Pleated air filters are available in MERV ratings from 5 to 12. As these filters collect dirt and other particles, they become less efficient to the point of impacting air flow. Allergy sufferers can benefit from this type of filter. These should be changed every two to three months based on local conditions. HEPA filters stand for High Efficiency Parti...