What MERV rating air filter should I choose for my home HVAC system?

The MERV rating you choose for an HVAC air filter depends on your needs. MERV 6–8 handles basic dust and lint, MERV 9–11 captures smaller particles like pollen and pet dander, and MERV 12–13 helps reduce fine particles such as smoke and some bacteria in residential systems.

How often should air filters be replaced in a central air system?

Air filters in a central air system should typically be replaced every 60–90 days. Replace more often, about every 30 days, if you have pets, allergies, heavy dust or run the system constantly. Check the filter monthly and change it when it looks gray, clogged or you notice reduced airflow.

How do I know what size air filter I need for my furnace or AC?

The easiest way to find the right air filter size is to read the dimensions printed on the frame of your existing filter, usually listed as length x width x thickness in inches. If the old filter is missing, measure the filter slot opening and choose the closest standard size that fits snugly.

What is the difference between fiberglass and pleated air filters?

The main difference between fiberglass and pleated air filters is filtration performance and lifespan. Fiberglass filters are inexpensive and catch larger dust but need frequent changes. Pleated filters use folded media to trap smaller particles, improve indoor air quality and typically last longer between replacements.