When and How to Change Your Furnace Filter

December 01, 2015

Taking care of your furnace can go a long way in the period in between furnace service appointments. One of the easiest, and critical, ways to care for your furnace is by replacing your furnace filter. Having a dirty air filter may contribute to a number of unfavorable problems for your heating and cooling system, its efficiency, and ultimately, how much you’re spending on your energy bills 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 typically need to be changed every month and 3 inch filters ought to be changed every three months, depending on the recommendations of the filter manufacturer.
  • Home habits: if you have pets in your home, it may make sense to replace your filter more often because of pet dander. If someone in your family suffers from allergies or asthma, think about switching out your home’s air filter more regularly to help ease their symptoms.

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

  • Open or take off the air filter panel close to 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 small amount of space to move your filter back and forth that allows you to pull down one end of the filter and remove it from the compartment.
  • When putting in the new filter, inspect the perimeter of the filter for an arrow that shows you the air flow direction, to ensure you’re installing the filter in the proper direction. In most cases, the arrow should point towards the main part (or top) of the furnace. 
At Strand Brothers 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 schedule an appointment with us online.