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 period in between furnace service appointments. One of the simplest, and essential, ways to take care of your furnace is by switching out your furnace filter. Having a clogged air filter can contribute to a host of adverse problems for your heating and cooling system, its efficiency, and ultimately, how much you’re spending on your energy bills each 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 usually need to be switched out every month and 3 inch filters ought to be swapped out every three months, based on the recommendations of the filter manufacturer.
  • Home habits: if you have pets in your home, it might make sense to replace your filter more often due to pet dander. If someone in your family has allergies or asthma, contemplate switching out your home’s air filter more regularly to help ease their symptoms.

Now you’re likely wondering how to change your furnace filter. Inevitably 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 expose an open compartment.
  • On the top of that open compartment is where your furnace filter is resting on two metal brackets.
  • There will be a bit of space to move your filter back and forth that allows you to remove one end of the filter and remove it from the compartment.
  • When adding the new filter, inspect the perimeter of the filter for an arrow that specifies the air flow direction, to make sure 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 Service Experts Heating & Air Conditioning, we’ll swap out 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.