![]() RELATED: Achieve Lower Bills and Cleaner Air with One Simple Replacement FAQ About MERV Ratings Is the higher the MERV rating the better? As has happened so many times in this home-building journey, I discover I don’t even know what I don’t know! But figuring out what that MERV rating on my filter actually means does make me breathe a little easier. So if you’re working with a builder to design a system, keep that in mind. When you’re changing filters four times a year, that really adds up. ![]() We discovered that our MERV filters are a custom size, which makes them about three times more expensive than standard-size filters you can buy at big box stores. Photo: When to Change Your MERV Air Filterįilters with higher MERV ratings need to be changed more frequently (at least every three months) to avoid restricted airflow that can cause your system to work inefficiently or possibly even damage it. HEPA filters are often considered the best when it comes to removing contaminants from at-home air. Environmental Protection Agency, which would fall into the MERV 16 rating. To up the indoor air quality even more, home air purifiers that employ HEPA (high-efficiency particulate air) filters can theoretically remove 99.97 percent mold, pollen, bacteria, and other particles as small as 0.3 microns, according to the U.S. If your home HVAC system is not capable of handling MERV 13, opt for a filter with the next highest rating possible. A higher MERV rating often means lower airflow, which can cause the system to work harder-use more energy-to do its job. But before you upgrade your filter, make sure your specific system can accommodate that rating. The Best MERV Rating for Residential HVAC System UseĪccording to the ASHRAE, the best rating for residential HVAC systems is MERV 13.
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