When and How to Change Your Furnace Filter

December 01, 2015

Taking care of your furnace can help more than you’d think in the time in between furnace service appointments. One of the easiest, and essential, ways to take care of your furnace lies in changing your furnace filter. Having a clogged air filter can contribute to a number of negative concerns for your heating and cooling system, its efficiency, and ultimately, how much you’re spending on your energy bills every month.

So what goes in to deciding when you should switch out 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 should be swapped out every three months, depending on the recommendations of the filter manufacturer.
  • Home habits: if you have pets in your home, it could make sense to change your filter more often because of pet dander. If you have someone in the house that has allergies or asthma, consider replacing your home’s air filter more regularly to help ease their symptoms.

Now you’re probably wondering how to swap out your furnace filter. Obviously this will vary depending on what furnace you have, but usually: 

  • 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 lips.
  • There will be a small amount of space to move your filter back and forth that allows you to remove 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 proper direction. In nearly all cases, the arrow should point to the main part (or top) of the furnace. 
At 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 set up an appointment with us online.