Instructables
Picture of How to Do Seasonal Furnace Maintenance
While not everyone does it, it’s extremely important to perform furnace maintenance to ensure that it’s running effectively and safely. It’s actually not all that difficult—pretty much anyone can do it, and if you’re a homeowner, you should know how to do it.

Materials:

• New air filter
• Light oil for motor bearing

Tools:

• Screwdriver
• Vacuum (with long snorkel attachment)
 
Remove these adsRemove these ads by Signing Up

Step 1: Turn off furnace power

Picture of Turn off furnace power
The first step is to turn off the gas and power that operates your furnace. There should be a switch located close to your furnace. If this is not the case, go to your electrical service panel and turn off the proper breaker. To turn off the gas, locate the gas line, which is connected to the furnace via a black pipe and turn it off by using the shut-off valve.

Step 2: Vacuum the interior of your furnace

Picture of Vacuum the interior of your furnace
Next, you’ll need to open your furnace door. Using a vacuum equipped with a long snorkel attachment, clean out the gas burners and the base of the furnace. Be sure to get rid of any loose debris or dust.

Step 3: Change your furnace’s air filter

Picture of Change your furnace’s air filter
During the heating season, you’ll most likely need to change your furnace’s air filter monthly. The air filter will either be located between the return air duct and blower or in the blower door unit itself. You might have to use a screwdriver to pry open the blower door or access panel. Once this is done, remove the air filter. With fiberglass or paper filters, you’ll notice there is an arrow on the filter’s frame that shows how you should insert the filter. If you have a foam filter, simply wash or vacuum the filter in order to clean it, and then replace it as appropriate.