When and How to Change Your Furnace Filter

December 01, 2015

Caring for your furnace can go a long way in the time in between furnace service appointments. One of the most basic, and crucial, ways to maintain your furnace is in replacing your furnace filter. Having a filthy air filter can contribute to a variety of adverse issues for your heating and cooling system, its efficiency, and ultimately, how much your energy expenses are month after month.

So what goes in to consideration when you should change your furnace filter?

  • Type of filter: the two most common filter sizes are 1 inch and 3 inch filters. 1 inch filters normally need to be replaced every month and 3 inch filters should be replaced every three months, based on the recommendations of the filter manufacturer.
  • Home habits: if you have pets in your home, it may make sense to switch out your filter more often due to pet dander. If a family member deals with allergies or asthma, contemplate changing your home’s air filter more regularly to help with their symptoms.

Now you’re possibly wondering how to replace your furnace filter. More than likely, this will change depending on what furnace you have, but normally: 

  • Open or take off the air filter panel near the bottom of your furnace to reveal an open compartment.
  • On the top of that open compartment is where you will find your furnace filter resting on two metal supports.
  • There will be a little space to move your filter back and forth that allows you to bring down one end of the filter and take it out of the compartment.
  • When adding the new filter, look at the perimeter of the filter for an arrow that shows you the air flow direction, to ensure you’re installing the filter in the correct direction. In the majority of cases, the arrow should point at the main part (or top) of the furnace. 
At Barlow Service Experts, we’ll replace standard one-inch furnace filters as part of our regular furnace service Precision Tune-up or PLUS Maintenance Agreement service. Give us a call today at or arrange an appointment with us online.