Most people have no idea what MERV stands for, and there's no reason they should — it's an HVAC engineering term that ended up on a product you buy twice a year. Here's the short version: a MERV rating tells you how good a filter is at pulling particles out of your air. The higher the number, the more it catches. This guide walks through what MERV actually is and what each rating means for your home.
MERV stands for Minimum Efficiency Reporting Value, a scale created by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate how well an air filter removes particles from the air. A higher MERV means better filtration.
For most homes, the useful range runs from MERV 8 through MERV 13. Filters in this range trap the particles that cause the most trouble indoors — dust, pollen, mold spores, dust mite debris, pet dander, smoke — and each step up the scale catches more of them and holds more before it needs changing.
There are really two things a MERV rating measures. The first is how well a filter removes larger airborne particles, the ones between 1 and 10 microns: pollen, pet dander, dust mite debris, and the like. But most of what floats around your home is smaller than that. MERV also accounts for submicron particles under 1 micron, which is where a lot of the particles you actually breathe deep into your lungs live.
The Accumulair Gold is your everyday filter: an electrostatically charged, pleated MERV 8 that keeps your system breathing easy while handling the basics. It traps up to 75% of large airborne particles — dust, lint, dust mite debris, pet dander, and pollen. If you want reliable, no-fuss protection and good airflow, this is the one.
The Accumulair Carbon does two jobs at once. It's an electrostatically charged, pleated MERV 10 with carbon built right into the media, so it filters and absorbs odor. It traps up to 80% of large airborne particles — pollen, dust, lint, dust mite debris, pet dander, ragweed, smoke, smog, mold spores, fungus, and bacteria — while the carbon works on pet odors and everyday smells that regular filters let right through. If your air is clean but doesn't smell clean, this is the filter that fixes it.
The Accumulair Platinum is the balanced pick: an electrostatically charged, pleated MERV 11 with filtration strength that steps up the protection without choking your airflow. It traps up to 85% of large airborne particles and reduces pollen, dust, lint, dust mite debris, pet dander, ragweed, smoke, smog, mold spores, fungus, and bacteria. It's a strong choice for homes where someone deals with allergies or general sensitivity.
If anyone in your home struggles with allergies or asthma, the Accumulair Diamond is the one we'd point you to. This electrostatically charged, pleated MERV 13 captures more allergens than any other filter we carry and traps up to 95% of large airborne particles. It reduces pollen, dust, lint, dust mite debris, pet dander, ragweed, smoke, smog, mold spores, fungus, bacteria, the particles that carry viruses, and VOCs — and it does all that while keeping airflow resistance low. It's the most protective filter we recommend for a home.
MERV 8, 11, and 13 are the most common choices for homes, and Carbon sits alongside them whenever odor is part of the problem. We don't recommend anything below MERV 8 for a home system — the cheap stuff barely filters at all. And while you can go higher than MERV 13, those filters start restricting airflow: the higher the rating, the harder your system has to push. That's why we steer most homes toward the MERV 8 to 13 range.
Shop for filters and you'll run into a few different rating systems, which is more confusing than it needs to be. They all exist to help you find the right filter — they just come from different places:
