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HVAC filters help your heating and cooling units run at peak efficiency while providing your home with clean, quality air. Filters use MERV ratings to indicate the performance level of the filter. But, what exactly is a MERV rating and what makes one rating differ from another? We’ve got your answers about air filter ratings right here!

What is a MERV rating?

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) designed the MERV rating system with ratings ranging from 1 to 16. As the numerical rating increases, so does the filters ability to trap smaller and smaller airborne contaminants. For example, a filter with a MERV rating of 13 will be able to trap more particulates than a filter with a MERV rating of 4.

Does a Higher MERV Rating Mean a Better Filter?

Generally, yes.  A filter with a higher MERV rating will be able to remove smaller particles from the air passing through it.  This means the air you breathe will be cleaner. Use the chart below to better understand the impact of a MERV rating.

Filtration Levels

Different filtration levels coincide with the different MERV ratings. We want our customers to find the right filter to fit their needs. Read through the different levels of protection to find the correct filter for your home.

Basic Protection

Filters with MERV ratings between 1 and 4 provide the most basic filtering protection. These filters are designed to protect an HVAC unit’s coils from becoming coated with dust and dirt, but are not efficient at removing allergens from the air or improving the quality of air in your home. Filters rated MERV 1 through 4 are the most budget friendly and can be found in multiple disposable styles and sizes to fit many HVAC units as well as window air conditioners.

General Filtration

Air filters with a MERV rating of 8 will remove more particulates and typically last longer than a filter with a MERV rating of 4. Much like filters with a MERV 4, MERV 8 filters will remove dust and dirt, but will also capture pollen, some mold spores and other particulates. Trapping these airborne impurities can help improve a home’s air quality, especially for anyone suffering from dust and pollen allergies. MERV 8 filters provide great filtration for those on a budget.

Filters for Pet Owners

Pet dander can cause more allergy problems than flyaway fur can. A filter with a MERV 11 rating will capture the majority of that dander. An air filter that can trap and control the amount of pet dander and other allergens circulating through an HVAC system can be a powerful tool in the battle against allergies. This type of filter will also last longer and make your HVAC system run more efficiently than lower rated filters. Though an air filter with a MERV 11 rating will remove more particulates than lower rated filters, those with severe allergies or asthma may want a filter with an even higher MERV rating.

Maximum Filtration

For those suffering regularly from allergies and/or asthma, a filter with a MERV rating of 13 or higher may drastically help improve your indoor air quality. Filters with high MERV ratings reduce airborne impurities such as dust, dirt, pollen, mold spores, pet dander and more from your home’s circulating air. Not only does a highly rated filter remove impurities, but it lasts longer than other filters and also helps your HVAC system run more efficiently than a lower rated filter. Though highly rate filters may cost more than other filters, the high quality filtration you receive is worth every penny.

Remember, when shopping for new HVAC filters; always keep the MERV ratings in mind. Whether you’re looking for a new air filter on a budget, or looking for maximum protection, MERV ratings will tell you which filter is right for you. It should be noted that the EPA states that filters rated between 7 and 13 may be near or as effective as some HEPA filters. You can find the right sized filter and MERV rating you need for your home at Discount Air Filters.