How Often You Need to Change Your Furnace Filter

How Often You Need to Change Your Furnace Filter

Bold Commerce CollaboratorDec 11, '19

If you swear by furnace filters to improve the air quality in your home, then you may be wondering how often you need to change your filter.


During the winter in Mississauga, where the weather gets colder and allergies flare-up, it is especially crucial to know how much time you need to change your filter to be comfortable.


Here on our PureFilters website, we describe how often should you change your furnace filter, so that you can keep everything up to date. Here are some basic rules.


Keep It Convenient


If you have bought a one-inch fiberglass filter before for your HVAC system, then you may have noticed on the package that it says to change it every 30 days. In essence, you won’t cause issues if you change your filter this much, you might even prevent some.


However, this process can be a hassle. When spring and fall come around, the filter won’t be as dirty as there’s not much need for heating and cooling. As a result, you don’t have to change your filter as frequently as you would during the winter and summer months.


If you live in a house with little infiltration or duct leakage and a small amount of dust, the filter can stay cleaner for longer, even if it is used often.  


Also, changing a filter every month can be expensive, mainly if you use filters with high-MERV ratings, which are more effective than lower quality filters, but can cost a bit more.


If you’re wondering how often you should change your furnace filter, high-MERV rated filters hold more dirt than other filters, so they don’t have to be changed as often.


Even though you can inspect a filter to see if it needs to be changed, there are other ways to determine how often you need to replace them.  


Pressure Drops Across a High-MERV Filter


One way to determine if your filter needs changing is by noticing when the pressure drop across the filter doubles in size from the initial pressure drop; if it does so, then it’s likely time to change your filter.


Since you may not be an HVAC expert and own a digital manometer, you can have a system set up with a Magnehelic gauge from a 0 to 0.5 i.w.c.


Waiting for the pressure drop across the filter to double works only on properly designed filters like the ones we sell at PureFilters. You also need to ensure that you have a duct system in place that’s designed properly and doesn’t contain resistance to airflow.


If you have purchased one of our top-quality highly-rated MERV filters, and you put it in with a pressure drop across a brand-new clean filter, do not let that filter load to where the pressure drop is 0.5 i.w.c. – this means that the pressure drop across the dirty filter is equal to the allowed amount of external static pressure.


As a result, the filter has used the pressure that’s supposed to be used throughout the entire duct system.  


If you want to use a performance-based method to identify if your filter needs replacing, then you must ensure your duct system and the design of the filter will function together.


If this is not the case, then you must purchase one of our exceptional filters so you can see when the filter needs changing by identifying the doubling of the filter pressure drop.  


Determining the Right Filter for Your Home


When many people shop for filters, they may be wondering which MERV-rating will work best for their home. While MERV 8 filters cover all the basics you’ll need, and MERV 13 filters cover the most intense of allergies, many people opt for a middle ground like MERV 11 furnace filters.


These filters are recommended for homes with infants or pets. They trap dust, debris, pollen, pet dander, and car fumes, making them an ideal choice for many households. 


How Often You Need to Change Your Furnace Filter

What to Do Now


Once you determine the best frequency to change your filter, you can sign up for our automated filter subscription. 


This subscription service takes away the hassle of changing your filter and ensures you won’t forget to change them. The process for this subscription is straightforward: you get to select the filter of your choosing and decide how frequently you want the filter delivered to your home.


Our secure system saves your credit card into our system automatically, bills your account, and ships the filters right to your doorstep. Subscriptions are available for many lengths of time: every month, every three months, every six months, or every 12 months.  


The option that will work best for you is dependent on how many filters you plan on ordering and how often you’ll need to replace your filters. By signing up for our automated subscription service, you will save a lot of time, and you will ensure that you have a fresh furnace filter for your needs. 


If you live in Mississauga and aren’t sure where you can find furnace filters for your home, we make the process easy for you by providing furnace filters shipped to Mississauga.


That way, you don’t have to run around town trying to find a filter that is compatible with your home and lifestyle. We make the ordering process simple, so you don’t have to think about it. 


Changing a furnace filter at the right amount of time is crucial for a properly functioning HVAC system, as well as reducing indoor air pollution to make your home more comfortable.


Now you know about air filters and how often they need to be changed, you can find one that will work best for your lifestyle.

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