Learning About MERV Ratings

To get the most out of your HVAC system, everyone says to look at MERV ratings. What exactly is MERV and why does it matter? Here’s the rundown:

MERV stands for Minimum Efficiency Reporting Value. It’s essentially measuring the effectiveness of the air filter in question. A filter can have a MERV rating ranging from 1 to 16. The higher the rating, the fewer dust particles and other contaminants can pass through it.

When filters are tested for a MERV rating, they use common particles like pollen, dust mites, carpet fibers, mold spores, pet dander, and more. Most residential systems can remove airborne contaminants like those listed above with a filter that has a MERV rating of 7-12. Filters with a rating of 13-16 are generally used in hospital-type settings.

The higher the MERV rating, the less particles that can get through the filter. This means the most efficient filter must have the highest rating, right? Not exactly. Filters with higher MERV ratings have smaller pores, which lets less air through. It can create resistance in airflow that the HVAC system can’t handle. The system will then have to work harder to pump air through the filter, lowering the efficiency and increasing the energy bill.

Every HVAC system is different. Find out what MERV rating the system can handle and still allow for maximum airflow. This will help homeowners get the most out of the HVAC system and get the cleanest air possible.

It’s also worth noting that filters with higher MERV ratings need to be changed more frequently than those with lower ratings. Because these filters are catching more contaminants, they are more likely to get clogged and restrict the airflow. Be sure to check the filters frequently and change them often for the best results.

Not sure which filter is best? Talk to the technicians at Diamond Heating and Cooling when they come out for an annual HVAC check-up. They’re happy to help and educate their customers.