Understand MERV 8, 11 & 13 ratings — customized for your household and air quality needs
MERV 8 delivers the best balance of filtration and airflow for most homes. It captures pollen, dust, mold spores, and dust mites — without choking your HVAC system or spiking energy bills. For everyday residential use, this is the smart choice.
If your household needs fall across multiple zones, we recommend choosing the higher-rated filter to ensure full coverage.
MERV 8 is a Minimum Efficiency Reporting Value rating that captures 70-85% of particles between 3.0 and 10.0 microns. This includes common household pollutants like dust, pollen, mold spores, dust mites, and pet dander. MERV 8 is the most recommended rating for standard residential HVAC systems because it provides effective filtration without restricting airflow or overworking your equipment.
For most homes, every 90 days (3 months) is the standard replacement interval for a 1-inch pleated MERV 8 filter. However, you should check your filter monthly. Replace sooner if you have pets, allergy sufferers, multiple occupants, or live in a dusty or high-pollen area. A dirty filter restricts airflow, raises energy bills, and shortens the life of your HVAC system.
Check the size printed on your current filter, or measure the filter slot in your HVAC system. Air filters use a nominal size (the rounded industry label like 16x20x1) and an actual size (the precise measurement like 15.5"x19.5"x0.75"). Valor carries four of the most popular residential sizes: 16x20x1, 16x25x1, 20x20x1, and 20x25x1. The nominal size is what you use to order — your filter slot was built for it.
MERV 8 effectively captures the most common allergens including pollen, dust mites, and mold spores. For most allergy sufferers, a MERV 8 filter replaced every 60-90 days provides significant relief. If you have severe respiratory conditions, consult your HVAC professional about whether your system can handle a higher MERV rating without airflow restriction.
Yes — a MERV rating that's too high for your system in a 1-inch filter can restrict airflow, causing your HVAC system to work harder. This increases energy consumption, can cause the evaporator coil to freeze, and may shorten the lifespan of your blower motor. MERV 8 is the safe, effective choice for most standard residential systems.