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 in replacing your furnace filter. Having a filthy air filter can contribute to a host 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 switched out every month and 3 inch filters ought to be replaced every three months, dependent 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 as a result of pet dander. If a family member suffers from allergies or asthma, think about changing your home’s air filter more regularly to help with their symptoms.

Now you’re possibly wondering how to change 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 around 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 remove one end of the filter and pull it out of the compartment.
  • When installing 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 nearly all cases, the arrow should point to the main part (or top) of the furnace. 
At Jack Nelson 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.