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Furnace Filters: How Often Should They Be Replaced?


One of the most common questions we get asked is how often should furnace filters be changed? Changing your furnace filters is above all one of the easiest things you can do to protect your heating and cooling Vancouver WA system. This simple act keeps your system running efficiently, avoids system breakdowns and can lengthen the lifespan of your system. For this reason, it is extremely important you change your filters on time. So how often to change furnace filter?

Filter Type

Filter types are determined by their MERV Rating. A MERV Rating, Minimum Efficiency Reporting Value, measures the effectiveness of filtration. The higher the MERV Rating the more effective the filter is at not allowing air particulates to pass through it. We offer MERV 8,10, 11 and 16 filters for sale at our office location and we can also special order unique sizes. The MERV rating also determines generally how often to change your furnace filter. MERV 8 filters should be changed every 3-4 months, MERV 10 & 11 filters every 6 months and MERV 16 filters every year.

Household Factors

There are certain household factors that could change how often to change furnace filter. First, do you have an air purifier? If so, you will end up needing to replace your furnace filters more often. Air purifiers improve the Indoor Air Quality (IAQ) in your home because they clump the air particulates together so they get stuck in your furnace filter and aren’t circulated throughout your home. We recommend The Protector has the best air purifier for your home due to it being tested, approved and used by the U.S. Military. It’s benefits include a reduction of surface mold and viruses by 99.9%, reduction of odors, particulate, smoke and VOCs and kills 99% of sneeze germs within 3 feet. As a result, your indoor IAQ is greatly improved and so is the health of your family.

Other household factors can cause your filter to become blocked quickly. Therefore, you will have to change your filter out more often. These factors include:

  • Animals in the home
  • Lots of dust in the home
  • Keeping the heating and/or AC fan on
  • Smoking in the home
  • Keeping the windows open
  • Individuals who suffer from allergies or asthma
  • Young children in the home

Visual Check

If you are still unsure how often should furnace filters be changed, you can complete a visual check. If there is only a thin layer of dirt where you can still see the filter underneath it, then you probably don’t have to change the filter. However, if there is a thick layer of dirt on where you can’t see the filter underneath it then it’s time to change it out. We recommend doing a quick visual check on your filter every 3-4 weeks if you are unsure how often should furnace filters be changed.

Speak with an Expert

Miller’s Heating & Air is your local heating and cooling vancouver wa filter experts. If you have any questions or concerns about how often furnace filters changed give us a call at 360-524-2880 or fill out an easy form online by clicking here. We have 8 professional heating and cooling vancouver wa technicians ready to help.

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