When and How to Change Your Furnace Filter

December 01, 2015

Taking care of your furnace can go a long way in the months in between furnace service appointments. One of the simplest, and essential, ways to care for your furnace lies in switching out your furnace filter. Having a filthy air filter may contribute to a number of unfavorable issues for your heating and cooling system, its efficiency, and ultimately, how much your energy expenses are every 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 switched out every month and 3 inch filters ought to be replaced every three months, dependent on the recommendations of the filter maker.
  • Home habits: if you have pets in your home, it may make sense to replace your filter more often as a result of pet dander. If you have someone in the house that suffers from allergies or asthma, think about switching out your home’s air filter more often to help potentially decrease their symptoms.

Now you’re probably wondering how to change your furnace filter. Inevitably this will differ depending on what furnace you have, but typically: 

  • Open or take off the air filter panel around the bottom of your furnace to expose an open compartment.
  • On the top of that open compartment is where you’ll see your furnace filter resting on two metal brackets.
  • There will be a bit of 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 installing the new filter, check the perimeter of the filter for an arrow that indicates the air flow direction, to be sure you’re installing the filter in the correct direction. In most cases, the arrow should point at the main part (or top) of the furnace. 
At Peitz Service Experts Heating & Air Conditioning, 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.