Changing your furnace filter regularly is one of the simplest ways to increase both your home furnace efficiency and air quality. The process is actually quick and easy, but there are also some important rules to follow. Check out some of our tips for a safe and trouble-free replacement below.
A few simple steps
Turn your furnace off
Look for a switch connecting to your furnace and switch it to the ‘Off’ position to ensure that the furnace won’t turn on during the filter replacement.
Note: If your furnace kicks on while there’s no filter inside, dust and debris can be sucked inside your furnace and cake up the underside of your AC coil which will cause big problems!
Remove the old filter
Once you remove the old filter, you’ll see a lot of dust covering it which is a good sign that it was ready to be changed.
If you haven’t already purchased a new filter, check the side of your old filter to determine what size it is, so you can buy a matching one.
Note: If you don’t have a new filter readily available, re-insert that filter so your furnace isn’t without one. Do not turn on your furnace without a filter placed inside.
Purchase a new filter
After you’ve determined your filter size, visit your nearest home maintenance store to buy one or you can order a filter online at
Once you have the new filter, go ahead and remove the old filter again (with the furnace off).
You’ll notice an arrow on one of the sides of the filter that’s labeled “Air Flow”, make sure this arrow is pointing in the direction of your furnace.
Turn your furnace back on
Now that your new filter is installed, go ahead and turn your furnace back on!
What if your filter is electronic?
Electronic furnace filters (also known as electronic air purifiers/ionizers) are reusable and efficient alternatives to the average furnace filter. They collect large clumps of dust in the prefilter and collect the smaller dust particles in the electrically charged filter.
Benefits of an electronic air filter
They are reusable
Instead of regularly changing out your old filter, all you need to do is remove your electronic filter and wash it.
They are more efficient
Up to 99% of dust particles are stopped from recirculating throughout your home.
They help with allergies
Since more fine particles are trapped, less bacteria, mold and other allergens are in the air you breathe which is important because these particles can often lead to illness.