Changing your filter is one of the most important steps of furnace repair. If you fail to replace your furnace filter, you can cause major damage to your unit. Depending on the season and the conditions of your home, you may need to change your filter up to once a month. To change your filter, you can first locate the air flow arrow. As you place the new filter in your furnace, make sure that this arrow is facing your furnace. If you are in need of other heater repair services , be sure to make an appointment with a company offering repairs for residential HVAC systems in Portland. With professional HVAC services, you can keep your system in fantastic working shape. For a look at how to change your furnace filter, watch this video from essortment.